chore: add anthropic skills for frontend testing (#29608)

Signed-off-by: yyh <yuanyouhuilyz@gmail.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

.claude/skills/frontend-testing/CHECKLIST.md

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+# Test Generation Checklist
+
+Use this checklist when generating or reviewing tests for Dify frontend components.
+
+## Pre-Generation
+
+- [ ] Read the component source code completely
+- [ ] Identify component type (component, hook, utility, page)
+- [ ] Run `pnpm analyze-component <path>` if available
+- [ ] Note complexity score and features detected
+- [ ] Check for existing tests in the same directory
+- [ ] **Identify ALL files in the directory** that need testing (not just index)
+
+## Testing Strategy
+
+### ⚠️ Incremental Workflow (CRITICAL for Multi-File)
+
+- [ ] **NEVER generate all tests at once** - process one file at a time
+- [ ] Order files by complexity: utilities → hooks → simple → complex → integration
+- [ ] Create a todo list to track progress before starting
+- [ ] For EACH file: write → run test → verify pass → then next
+- [ ] **DO NOT proceed** to next file until current one passes
+
+### Path-Level Coverage
+
+- [ ] **Test ALL files** in the assigned directory/path
+- [ ] List all components, hooks, utilities that need coverage
+- [ ] Decide: single spec file (integration) or multiple spec files (unit)
+
+### Complexity Assessment
+
+- [ ] Run `pnpm analyze-component <path>` for complexity score
+- [ ] **Complexity > 50**: Consider refactoring before testing
+- [ ] **500+ lines**: Consider splitting before testing
+- [ ] **30-50 complexity**: Use multiple describe blocks, organized structure
+
+### Integration vs Mocking
+
+- [ ] **DO NOT mock base components** (`Loading`, `Button`, `Tooltip`, etc.)
+- [ ] Import real project components instead of mocking
+- [ ] Only mock: API calls, complex context providers, third-party libs with side effects
+- [ ] Prefer integration testing when using single spec file
+
+## Required Test Sections
+
+### All Components MUST Have
+
+- [ ] **Rendering tests** - Component renders without crashing
+- [ ] **Props tests** - Required props, optional props, default values
+- [ ] **Edge cases** - null, undefined, empty values, boundaries
+
+### Conditional Sections (Add When Feature Present)
+
+| Feature | Add Tests For |
+|---------|---------------|
+| `useState` | Initial state, transitions, cleanup |
+| `useEffect` | Execution, dependencies, cleanup |
+| Event handlers | onClick, onChange, onSubmit, keyboard |
+| API calls | Loading, success, error states |
+| Routing | Navigation, params, query strings |
+| `useCallback`/`useMemo` | Referential equality |
+| Context | Provider values, consumer behavior |
+| Forms | Validation, submission, error display |
+
+## Code Quality Checklist
+
+### Structure
+
+- [ ] Uses `describe` blocks to group related tests
+- [ ] Test names follow `should <behavior> when <condition>` pattern
+- [ ] AAA pattern (Arrange-Act-Assert) is clear
+- [ ] Comments explain complex test scenarios
+
+### Mocks
+
+- [ ] **DO NOT mock base components** (`@/app/components/base/*`)
+- [ ] `jest.clearAllMocks()` in `beforeEach` (not `afterEach`)
+- [ ] Shared mock state reset in `beforeEach`
+- [ ] i18n mock returns keys (not empty strings)
+- [ ] Router mocks match actual Next.js API
+- [ ] Mocks reflect actual component conditional behavior
+- [ ] Only mock: API services, complex context providers, third-party libs
+
+### Queries
+
+- [ ] Prefer semantic queries (`getByRole`, `getByLabelText`)
+- [ ] Use `queryBy*` for absence assertions
+- [ ] Use `findBy*` for async elements
+- [ ] `getByTestId` only as last resort
+
+### Async
+
+- [ ] All async tests use `async/await`
+- [ ] `waitFor` wraps async assertions
+- [ ] Fake timers properly setup/teardown
+- [ ] No floating promises
+
+### TypeScript
+
+- [ ] No `any` types without justification
+- [ ] Mock data uses actual types from source
+- [ ] Factory functions have proper return types
+
+## Coverage Goals (Per File)
+
+For the current file being tested:
+
+- [ ] 100% function coverage
+- [ ] 100% statement coverage
+- [ ] >95% branch coverage
+- [ ] >95% line coverage
+
+## Post-Generation (Per File)
+
+**Run these checks after EACH test file, not just at the end:**
+
+- [ ] Run `pnpm test -- path/to/file.spec.tsx` - **MUST PASS before next file**
+- [ ] Fix any failures immediately
+- [ ] Mark file as complete in todo list
+- [ ] Only then proceed to next file
+
+### After All Files Complete
+
+- [ ] Run full directory test: `pnpm test -- path/to/directory/`
+- [ ] Check coverage report: `pnpm test -- --coverage`
+- [ ] Run `pnpm lint:fix` on all test files
+- [ ] Run `pnpm type-check:tsgo`
+
+## Common Issues to Watch
+
+### False Positives
+
+```typescript
+// ❌ Mock doesn't match actual behavior
+jest.mock('./Component', () => () => <div>Mocked</div>)
+
+// ✅ Mock matches actual conditional logic
+jest.mock('./Component', () => ({ isOpen }: any) =>
+  isOpen ? <div>Content</div> : null
+)
+```
+
+### State Leakage
+
+```typescript
+// ❌ Shared state not reset
+let mockState = false
+jest.mock('./useHook', () => () => mockState)
+
+// ✅ Reset in beforeEach
+beforeEach(() => {
+  mockState = false
+})
+```
+
+### Async Race Conditions
+
+```typescript
+// ❌ Not awaited
+it('loads data', () => {
+  render(<Component />)
+  expect(screen.getByText('Data')).toBeInTheDocument()
+})
+
+// ✅ Properly awaited
+it('loads data', async () => {
+  render(<Component />)
+  await waitFor(() => {
+    expect(screen.getByText('Data')).toBeInTheDocument()
+  })
+})
+```
+
+### Missing Edge Cases
+
+Always test these scenarios:
+
+- `null` / `undefined` inputs
+- Empty strings / arrays / objects
+- Boundary values (0, -1, MAX_INT)
+- Error states
+- Loading states
+- Disabled states
+
+## Quick Commands
+
+```bash
+# Run specific test
+pnpm test -- path/to/file.spec.tsx
+
+# Run with coverage
+pnpm test -- --coverage path/to/file.spec.tsx
+
+# Watch mode
+pnpm test -- --watch path/to/file.spec.tsx
+
+# Update snapshots (use sparingly)
+pnpm test -- -u path/to/file.spec.tsx
+
+# Analyze component
+pnpm analyze-component path/to/component.tsx
+
+# Review existing test
+pnpm analyze-component path/to/component.tsx --review
+```

.claude/skills/frontend-testing/SKILL.md

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+---
+name: Dify Frontend Testing
+description: Generate Jest + React Testing Library tests for Dify frontend components, hooks, and utilities. Triggers on testing, spec files, coverage, Jest, RTL, unit tests, integration tests, or write/review test requests.
+---
+
+# Dify Frontend Testing Skill
+
+This skill enables Claude to generate high-quality, comprehensive frontend tests for the Dify project following established conventions and best practices.
+
+> **⚠️ Authoritative Source**: This skill is derived from `web/testing/testing.md`. When in doubt, always refer to that document as the canonical specification.
+
+## When to Apply This Skill
+
+Apply this skill when the user:
+
+- Asks to **write tests** for a component, hook, or utility
+- Asks to **review existing tests** for completeness
+- Mentions **Jest**, **React Testing Library**, **RTL**, or **spec files**
+- Requests **test coverage** improvement
+- Uses `pnpm analyze-component` output as context
+- Mentions **testing**, **unit tests**, or **integration tests** for frontend code
+- Wants to understand **testing patterns** in the Dify codebase
+
+**Do NOT apply** when:
+
+- User is asking about backend/API tests (Python/pytest)
+- User is asking about E2E tests (Playwright/Cypress)
+- User is only asking conceptual questions without code context
+
+## Quick Reference
+
+### Tech Stack
+
+| Tool | Version | Purpose |
+|------|---------|---------|
+| Jest | 29.7 | Test runner |
+| React Testing Library | 16.0 | Component testing |
+| happy-dom | - | Test environment |
+| nock | 14.0 | HTTP mocking |
+| TypeScript | 5.x | Type safety |
+
+### Key Commands
+
+```bash
+# Run all tests
+pnpm test
+
+# Watch mode
+pnpm test -- --watch
+
+# Run specific file
+pnpm test -- path/to/file.spec.tsx
+
+# Generate coverage report
+pnpm test -- --coverage
+
+# Analyze component complexity
+pnpm analyze-component <path>
+
+# Review existing test
+pnpm analyze-component <path> --review
+```
+
+### File Naming
+
+- Test files: `ComponentName.spec.tsx` (same directory as component)
+- Integration tests: `web/__tests__/` directory
+
+## Test Structure Template
+
+```typescript
+import { render, screen, fireEvent, waitFor } from '@testing-library/react'
+import Component from './index'
+
+// ✅ Import real project components (DO NOT mock these)
+// import Loading from '@/app/components/base/loading'
+// import { ChildComponent } from './child-component'
+
+// ✅ Mock external dependencies only
+jest.mock('@/service/api')
+jest.mock('next/navigation', () => ({
+  useRouter: () => ({ push: jest.fn() }),
+  usePathname: () => '/test',
+}))
+
+// Shared state for mocks (if needed)
+let mockSharedState = false
+
+describe('ComponentName', () => {
+  beforeEach(() => {
+    jest.clearAllMocks()  // ✅ Reset mocks BEFORE each test
+    mockSharedState = false  // ✅ Reset shared state
+  })
+
+  // Rendering tests (REQUIRED)
+  describe('Rendering', () => {
+    it('should render without crashing', () => {
+      // Arrange
+      const props = { title: 'Test' }
+      
+      // Act
+      render(<Component {...props} />)
+      
+      // Assert
+      expect(screen.getByText('Test')).toBeInTheDocument()
+    })
+  })
+
+  // Props tests (REQUIRED)
+  describe('Props', () => {
+    it('should apply custom className', () => {
+      render(<Component className="custom" />)
+      expect(screen.getByRole('button')).toHaveClass('custom')
+    })
+  })
+
+  // User Interactions
+  describe('User Interactions', () => {
+    it('should handle click events', () => {
+      const handleClick = jest.fn()
+      render(<Component onClick={handleClick} />)
+      
+      fireEvent.click(screen.getByRole('button'))
+      
+      expect(handleClick).toHaveBeenCalledTimes(1)
+    })
+  })
+
+  // Edge Cases (REQUIRED)
+  describe('Edge Cases', () => {
+    it('should handle null data', () => {
+      render(<Component data={null} />)
+      expect(screen.getByText(/no data/i)).toBeInTheDocument()
+    })
+
+    it('should handle empty array', () => {
+      render(<Component items={[]} />)
+      expect(screen.getByText(/empty/i)).toBeInTheDocument()
+    })
+  })
+})
+```
+
+## Testing Workflow (CRITICAL)
+
+### ⚠️ Incremental Approach Required
+
+**NEVER generate all test files at once.** For complex components or multi-file directories:
+
+1. **Analyze & Plan**: List all files, order by complexity (simple → complex)
+1. **Process ONE at a time**: Write test → Run test → Fix if needed → Next
+1. **Verify before proceeding**: Do NOT continue to next file until current passes
+
+```
+For each file:
+  ┌────────────────────────────────────────┐
+  │ 1. Write test                          │
+  │ 2. Run: pnpm test -- <file>.spec.tsx   │
+  │ 3. PASS? → Mark complete, next file    │
+  │    FAIL? → Fix first, then continue    │
+  └────────────────────────────────────────┘
+```
+
+### Complexity-Based Order
+
+Process in this order for multi-file testing:
+
+1. 🟢 Utility functions (simplest)
+1. 🟢 Custom hooks
+1. 🟡 Simple components (presentational)
+1. 🟡 Medium components (state, effects)
+1. 🔴 Complex components (API, routing)
+1. 🔴 Integration tests (index files - last)
+
+### When to Refactor First
+
+- **Complexity > 50**: Break into smaller pieces before testing
+- **500+ lines**: Consider splitting before testing
+- **Many dependencies**: Extract logic into hooks first
+
+> 📖 See `guides/workflow.md` for complete workflow details and todo list format.
+
+## Testing Strategy
+
+### Path-Level Testing (Directory Testing)
+
+When assigned to test a directory/path, test **ALL content** within that path:
+
+- Test all components, hooks, utilities in the directory (not just `index` file)
+- Use incremental approach: one file at a time, verify each before proceeding
+- Goal: 100% coverage of ALL files in the directory
+
+### Integration Testing First
+
+**Prefer integration testing** when writing tests for a directory:
+
+- ✅ **Import real project components** directly (including base components and siblings)
+- ✅ **Only mock**: API services (`@/service/*`), `next/navigation`, complex context providers
+- ❌ **DO NOT mock** base components (`@/app/components/base/*`)
+- ❌ **DO NOT mock** sibling/child components in the same directory
+
+> See [Test Structure Template](#test-structure-template) for correct import/mock patterns.
+
+## Core Principles
+
+### 1. AAA Pattern (Arrange-Act-Assert)
+
+Every test should clearly separate:
+
+- **Arrange**: Setup test data and render component
+- **Act**: Perform user actions
+- **Assert**: Verify expected outcomes
+
+### 2. Black-Box Testing
+
+- Test observable behavior, not implementation details
+- Use semantic queries (getByRole, getByLabelText)
+- Avoid testing internal state directly
+- **Prefer pattern matching over hardcoded strings** in assertions:
+
+```typescript
+// ❌ Avoid: hardcoded text assertions
+expect(screen.getByText('Loading...')).toBeInTheDocument()
+
+// ✅ Better: role-based queries
+expect(screen.getByRole('status')).toBeInTheDocument()
+
+// ✅ Better: pattern matching
+expect(screen.getByText(/loading/i)).toBeInTheDocument()
+```
+
+### 3. Single Behavior Per Test
+
+Each test verifies ONE user-observable behavior:
+
+```typescript
+// ✅ Good: One behavior
+it('should disable button when loading', () => {
+  render(<Button loading />)
+  expect(screen.getByRole('button')).toBeDisabled()
+})
+
+// ❌ Bad: Multiple behaviors
+it('should handle loading state', () => {
+  render(<Button loading />)
+  expect(screen.getByRole('button')).toBeDisabled()
+  expect(screen.getByText('Loading...')).toBeInTheDocument()
+  expect(screen.getByRole('button')).toHaveClass('loading')
+})
+```
+
+### 4. Semantic Naming
+
+Use `should <behavior> when <condition>`:
+
+```typescript
+it('should show error message when validation fails')
+it('should call onSubmit when form is valid')
+it('should disable input when isReadOnly is true')
+```
+
+## Required Test Scenarios
+
+### Always Required (All Components)
+
+1. **Rendering**: Component renders without crashing
+1. **Props**: Required props, optional props, default values
+1. **Edge Cases**: null, undefined, empty values, boundary conditions
+
+### Conditional (When Present)
+
+| Feature | Test Focus |
+|---------|-----------|
+| `useState` | Initial state, transitions, cleanup |
+| `useEffect` | Execution, dependencies, cleanup |
+| Event handlers | All onClick, onChange, onSubmit, keyboard |
+| API calls | Loading, success, error states |
+| Routing | Navigation, params, query strings |
+| `useCallback`/`useMemo` | Referential equality |
+| Context | Provider values, consumer behavior |
+| Forms | Validation, submission, error display |
+
+## Coverage Goals (Per File)
+
+For each test file generated, aim for:
+
+- ✅ **100%** function coverage
+- ✅ **100%** statement coverage
+- ✅ **>95%** branch coverage
+- ✅ **>95%** line coverage
+
+> **Note**: For multi-file directories, process one file at a time with full coverage each. See `guides/workflow.md`.
+
+## Detailed Guides
+
+For more detailed information, refer to:
+
+- `guides/workflow.md` - **Incremental testing workflow** (MUST READ for multi-file testing)
+- `guides/mocking.md` - Mock patterns and best practices
+- `guides/async-testing.md` - Async operations and API calls
+- `guides/domain-components.md` - Workflow, Dataset, Configuration testing
+- `guides/common-patterns.md` - Frequently used testing patterns
+
+## Authoritative References
+
+### Primary Specification (MUST follow)
+
+- **`web/testing/testing.md`** - The canonical testing specification. This skill is derived from this document.
+
+### Reference Examples in Codebase
+
+- `web/utils/classnames.spec.ts` - Utility function tests
+- `web/app/components/base/button/index.spec.tsx` - Component tests
+- `web/__mocks__/provider-context.ts` - Mock factory example
+
+### Project Configuration
+
+- `web/jest.config.ts` - Jest configuration
+- `web/jest.setup.ts` - Test environment setup
+- `web/testing/analyze-component.js` - Component analysis tool

.claude/skills/frontend-testing/guides/async-testing.md

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+# Async Testing Guide
+
+## Core Async Patterns
+
+### 1. waitFor - Wait for Condition
+
+```typescript
+import { render, screen, waitFor } from '@testing-library/react'
+
+it('should load and display data', async () => {
+  render(<DataComponent />)
+  
+  // Wait for element to appear
+  await waitFor(() => {
+    expect(screen.getByText('Loaded Data')).toBeInTheDocument()
+  })
+})
+
+it('should hide loading spinner after load', async () => {
+  render(<DataComponent />)
+  
+  // Wait for element to disappear
+  await waitFor(() => {
+    expect(screen.queryByText('Loading...')).not.toBeInTheDocument()
+  })
+})
+```
+
+### 2. findBy\* - Async Queries
+
+```typescript
+it('should show user name after fetch', async () => {
+  render(<UserProfile />)
+  
+  // findBy returns a promise, auto-waits up to 1000ms
+  const userName = await screen.findByText('John Doe')
+  expect(userName).toBeInTheDocument()
+  
+  // findByRole with options
+  const button = await screen.findByRole('button', { name: /submit/i })
+  expect(button).toBeEnabled()
+})
+```
+
+### 3. userEvent for Async Interactions
+
+```typescript
+import userEvent from '@testing-library/user-event'
+
+it('should submit form', async () => {
+  const user = userEvent.setup()
+  const onSubmit = jest.fn()
+  
+  render(<Form onSubmit={onSubmit} />)
+  
+  // userEvent methods are async
+  await user.type(screen.getByLabelText('Email'), 'test@example.com')
+  await user.click(screen.getByRole('button', { name: /submit/i }))
+  
+  await waitFor(() => {
+    expect(onSubmit).toHaveBeenCalledWith({ email: 'test@example.com' })
+  })
+})
+```
+
+## Fake Timers
+
+### When to Use Fake Timers
+
+- Testing components with `setTimeout`/`setInterval`
+- Testing debounce/throttle behavior
+- Testing animations or delayed transitions
+- Testing polling or retry logic
+
+### Basic Fake Timer Setup
+
+```typescript
+describe('Debounced Search', () => {
+  beforeEach(() => {
+    jest.useFakeTimers()
+  })
+
+  afterEach(() => {
+    jest.useRealTimers()
+  })
+
+  it('should debounce search input', async () => {
+    const onSearch = jest.fn()
+    render(<SearchInput onSearch={onSearch} debounceMs={300} />)
+    
+    // Type in the input
+    fireEvent.change(screen.getByRole('textbox'), { target: { value: 'query' } })
+    
+    // Search not called immediately
+    expect(onSearch).not.toHaveBeenCalled()
+    
+    // Advance timers
+    jest.advanceTimersByTime(300)
+    
+    // Now search is called
+    expect(onSearch).toHaveBeenCalledWith('query')
+  })
+})
+```
+
+### Fake Timers with Async Code
+
+```typescript
+it('should retry on failure', async () => {
+  jest.useFakeTimers()
+  const fetchData = jest.fn()
+    .mockRejectedValueOnce(new Error('Network error'))
+    .mockResolvedValueOnce({ data: 'success' })
+  
+  render(<RetryComponent fetchData={fetchData} retryDelayMs={1000} />)
+  
+  // First call fails
+  await waitFor(() => {
+    expect(fetchData).toHaveBeenCalledTimes(1)
+  })
+  
+  // Advance timer for retry
+  jest.advanceTimersByTime(1000)
+  
+  // Second call succeeds
+  await waitFor(() => {
+    expect(fetchData).toHaveBeenCalledTimes(2)
+    expect(screen.getByText('success')).toBeInTheDocument()
+  })
+  
+  jest.useRealTimers()
+})
+```
+
+### Common Fake Timer Utilities
+
+```typescript
+// Run all pending timers
+jest.runAllTimers()
+
+// Run only pending timers (not new ones created during execution)
+jest.runOnlyPendingTimers()
+
+// Advance by specific time
+jest.advanceTimersByTime(1000)
+
+// Get current fake time
+jest.now()
+
+// Clear all timers
+jest.clearAllTimers()
+```
+
+## API Testing Patterns
+
+### Loading → Success → Error States
+
+```typescript
+describe('DataFetcher', () => {
+  beforeEach(() => {
+    jest.clearAllMocks()
+  })
+
+  it('should show loading state', () => {
+    mockedApi.fetchData.mockImplementation(() => new Promise(() => {})) // Never resolves
+    
+    render(<DataFetcher />)
+    
+    expect(screen.getByTestId('loading-spinner')).toBeInTheDocument()
+  })
+
+  it('should show data on success', async () => {
+    mockedApi.fetchData.mockResolvedValue({ items: ['Item 1', 'Item 2'] })
+    
+    render(<DataFetcher />)
+    
+    // Use findBy* for multiple async elements (better error messages than waitFor with multiple assertions)
+    const item1 = await screen.findByText('Item 1')
+    const item2 = await screen.findByText('Item 2')
+    expect(item1).toBeInTheDocument()
+    expect(item2).toBeInTheDocument()
+    
+    expect(screen.queryByTestId('loading-spinner')).not.toBeInTheDocument()
+  })
+
+  it('should show error on failure', async () => {
+    mockedApi.fetchData.mockRejectedValue(new Error('Failed to fetch'))
+    
+    render(<DataFetcher />)
+    
+    await waitFor(() => {
+      expect(screen.getByText(/failed to fetch/i)).toBeInTheDocument()
+    })
+  })
+
+  it('should retry on error', async () => {
+    mockedApi.fetchData.mockRejectedValue(new Error('Network error'))
+    
+    render(<DataFetcher />)
+    
+    await waitFor(() => {
+      expect(screen.getByRole('button', { name: /retry/i })).toBeInTheDocument()
+    })
+    
+    mockedApi.fetchData.mockResolvedValue({ items: ['Item 1'] })
+    fireEvent.click(screen.getByRole('button', { name: /retry/i }))
+    
+    await waitFor(() => {
+      expect(screen.getByText('Item 1')).toBeInTheDocument()
+    })
+  })
+})
+```
+
+### Testing Mutations
+
+```typescript
+it('should submit form and show success', async () => {
+  const user = userEvent.setup()
+  mockedApi.createItem.mockResolvedValue({ id: '1', name: 'New Item' })
+  
+  render(<CreateItemForm />)
+  
+  await user.type(screen.getByLabelText('Name'), 'New Item')
+  await user.click(screen.getByRole('button', { name: /create/i }))
+  
+  // Button should be disabled during submission
+  expect(screen.getByRole('button', { name: /creating/i })).toBeDisabled()
+  
+  await waitFor(() => {
+    expect(screen.getByText(/created successfully/i)).toBeInTheDocument()
+  })
+  
+  expect(mockedApi.createItem).toHaveBeenCalledWith({ name: 'New Item' })
+})
+```
+
+## useEffect Testing
+
+### Testing Effect Execution
+
+```typescript
+it('should fetch data on mount', async () => {
+  const fetchData = jest.fn().mockResolvedValue({ data: 'test' })
+  
+  render(<ComponentWithEffect fetchData={fetchData} />)
+  
+  await waitFor(() => {
+    expect(fetchData).toHaveBeenCalledTimes(1)
+  })
+})
+```
+
+### Testing Effect Dependencies
+
+```typescript
+it('should refetch when id changes', async () => {
+  const fetchData = jest.fn().mockResolvedValue({ data: 'test' })
+  
+  const { rerender } = render(<ComponentWithEffect id="1" fetchData={fetchData} />)
+  
+  await waitFor(() => {
+    expect(fetchData).toHaveBeenCalledWith('1')
+  })
+  
+  rerender(<ComponentWithEffect id="2" fetchData={fetchData} />)
+  
+  await waitFor(() => {
+    expect(fetchData).toHaveBeenCalledWith('2')
+    expect(fetchData).toHaveBeenCalledTimes(2)
+  })
+})
+```
+
+### Testing Effect Cleanup
+
+```typescript
+it('should cleanup subscription on unmount', () => {
+  const subscribe = jest.fn()
+  const unsubscribe = jest.fn()
+  subscribe.mockReturnValue(unsubscribe)
+  
+  const { unmount } = render(<SubscriptionComponent subscribe={subscribe} />)
+  
+  expect(subscribe).toHaveBeenCalledTimes(1)
+  
+  unmount()
+  
+  expect(unsubscribe).toHaveBeenCalledTimes(1)
+})
+```
+
+## Common Async Pitfalls
+
+### ❌ Don't: Forget to await
+
+```typescript
+// Bad - test may pass even if assertion fails
+it('should load data', () => {
+  render(<Component />)
+  waitFor(() => {
+    expect(screen.getByText('Data')).toBeInTheDocument()
+  })
+})
+
+// Good - properly awaited
+it('should load data', async () => {
+  render(<Component />)
+  await waitFor(() => {
+    expect(screen.getByText('Data')).toBeInTheDocument()
+  })
+})
+```
+
+### ❌ Don't: Use multiple assertions in single waitFor
+
+```typescript
+// Bad - if first assertion fails, won't know about second
+await waitFor(() => {
+  expect(screen.getByText('Title')).toBeInTheDocument()
+  expect(screen.getByText('Description')).toBeInTheDocument()
+})
+
+// Good - separate waitFor or use findBy
+const title = await screen.findByText('Title')
+const description = await screen.findByText('Description')
+expect(title).toBeInTheDocument()
+expect(description).toBeInTheDocument()
+```
+
+### ❌ Don't: Mix fake timers with real async
+
+```typescript
+// Bad - fake timers don't work well with real Promises
+jest.useFakeTimers()
+await waitFor(() => {
+  expect(screen.getByText('Data')).toBeInTheDocument()
+}) // May timeout!
+
+// Good - use runAllTimers or advanceTimersByTime
+jest.useFakeTimers()
+render(<Component />)
+jest.runAllTimers()
+expect(screen.getByText('Data')).toBeInTheDocument()
+```

.claude/skills/frontend-testing/guides/common-patterns.md

@@ -0,0 +1,449 @@
+# Common Testing Patterns
+
+## Query Priority
+
+Use queries in this order (most to least preferred):
+
+```typescript
+// 1. getByRole - Most recommended (accessibility)
+screen.getByRole('button', { name: /submit/i })
+screen.getByRole('textbox', { name: /email/i })
+screen.getByRole('heading', { level: 1 })
+
+// 2. getByLabelText - Form fields
+screen.getByLabelText('Email address')
+screen.getByLabelText(/password/i)
+
+// 3. getByPlaceholderText - When no label
+screen.getByPlaceholderText('Search...')
+
+// 4. getByText - Non-interactive elements
+screen.getByText('Welcome to Dify')
+screen.getByText(/loading/i)
+
+// 5. getByDisplayValue - Current input value
+screen.getByDisplayValue('current value')
+
+// 6. getByAltText - Images
+screen.getByAltText('Company logo')
+
+// 7. getByTitle - Tooltip elements
+screen.getByTitle('Close')
+
+// 8. getByTestId - Last resort only!
+screen.getByTestId('custom-element')
+```
+
+## Event Handling Patterns
+
+### Click Events
+
+```typescript
+// Basic click
+fireEvent.click(screen.getByRole('button'))
+
+// With userEvent (preferred for realistic interaction)
+const user = userEvent.setup()
+await user.click(screen.getByRole('button'))
+
+// Double click
+await user.dblClick(screen.getByRole('button'))
+
+// Right click
+await user.pointer({ keys: '[MouseRight]', target: screen.getByRole('button') })
+```
+
+### Form Input
+
+```typescript
+const user = userEvent.setup()
+
+// Type in input
+await user.type(screen.getByRole('textbox'), 'Hello World')
+
+// Clear and type
+await user.clear(screen.getByRole('textbox'))
+await user.type(screen.getByRole('textbox'), 'New value')
+
+// Select option
+await user.selectOptions(screen.getByRole('combobox'), 'option-value')
+
+// Check checkbox
+await user.click(screen.getByRole('checkbox'))
+
+// Upload file
+const file = new File(['content'], 'test.pdf', { type: 'application/pdf' })
+await user.upload(screen.getByLabelText(/upload/i), file)
+```
+
+### Keyboard Events
+
+```typescript
+const user = userEvent.setup()
+
+// Press Enter
+await user.keyboard('{Enter}')
+
+// Press Escape
+await user.keyboard('{Escape}')
+
+// Keyboard shortcut
+await user.keyboard('{Control>}a{/Control}') // Ctrl+A
+
+// Tab navigation
+await user.tab()
+
+// Arrow keys
+await user.keyboard('{ArrowDown}')
+await user.keyboard('{ArrowUp}')
+```
+
+## Component State Testing
+
+### Testing State Transitions
+
+```typescript
+describe('Counter', () => {
+  it('should increment count', async () => {
+    const user = userEvent.setup()
+    render(<Counter initialCount={0} />)
+    
+    // Initial state
+    expect(screen.getByText('Count: 0')).toBeInTheDocument()
+    
+    // Trigger transition
+    await user.click(screen.getByRole('button', { name: /increment/i }))
+    
+    // New state
+    expect(screen.getByText('Count: 1')).toBeInTheDocument()
+  })
+})
+```
+
+### Testing Controlled Components
+
+```typescript
+describe('ControlledInput', () => {
+  it('should call onChange with new value', async () => {
+    const user = userEvent.setup()
+    const handleChange = jest.fn()
+    
+    render(<ControlledInput value="" onChange={handleChange} />)
+    
+    await user.type(screen.getByRole('textbox'), 'a')
+    
+    expect(handleChange).toHaveBeenCalledWith('a')
+  })
+
+  it('should display controlled value', () => {
+    render(<ControlledInput value="controlled" onChange={jest.fn()} />)
+    
+    expect(screen.getByRole('textbox')).toHaveValue('controlled')
+  })
+})
+```
+
+## Conditional Rendering Testing
+
+```typescript
+describe('ConditionalComponent', () => {
+  it('should show loading state', () => {
+    render(<DataDisplay isLoading={true} data={null} />)
+    
+    expect(screen.getByText(/loading/i)).toBeInTheDocument()
+    expect(screen.queryByTestId('data-content')).not.toBeInTheDocument()
+  })
+
+  it('should show error state', () => {
+    render(<DataDisplay isLoading={false} data={null} error="Failed to load" />)
+    
+    expect(screen.getByText(/failed to load/i)).toBeInTheDocument()
+  })
+
+  it('should show data when loaded', () => {
+    render(<DataDisplay isLoading={false} data={{ name: 'Test' }} />)
+    
+    expect(screen.getByText('Test')).toBeInTheDocument()
+  })
+
+  it('should show empty state when no data', () => {
+    render(<DataDisplay isLoading={false} data={[]} />)
+    
+    expect(screen.getByText(/no data/i)).toBeInTheDocument()
+  })
+})
+```
+
+## List Rendering Testing
+
+```typescript
+describe('ItemList', () => {
+  const items = [
+    { id: '1', name: 'Item 1' },
+    { id: '2', name: 'Item 2' },
+    { id: '3', name: 'Item 3' },
+  ]
+
+  it('should render all items', () => {
+    render(<ItemList items={items} />)
+    
+    expect(screen.getAllByRole('listitem')).toHaveLength(3)
+    items.forEach(item => {
+      expect(screen.getByText(item.name)).toBeInTheDocument()
+    })
+  })
+
+  it('should handle item selection', async () => {
+    const user = userEvent.setup()
+    const onSelect = jest.fn()
+    
+    render(<ItemList items={items} onSelect={onSelect} />)
+    
+    await user.click(screen.getByText('Item 2'))
+    
+    expect(onSelect).toHaveBeenCalledWith(items[1])
+  })
+
+  it('should handle empty list', () => {
+    render(<ItemList items={[]} />)
+    
+    expect(screen.getByText(/no items/i)).toBeInTheDocument()
+  })
+})
+```
+
+## Modal/Dialog Testing
+
+```typescript
+describe('Modal', () => {
+  it('should not render when closed', () => {
+    render(<Modal isOpen={false} onClose={jest.fn()} />)
+    
+    expect(screen.queryByRole('dialog')).not.toBeInTheDocument()
+  })
+
+  it('should render when open', () => {
+    render(<Modal isOpen={true} onClose={jest.fn()} />)
+    
+    expect(screen.getByRole('dialog')).toBeInTheDocument()
+  })
+
+  it('should call onClose when clicking overlay', async () => {
+    const user = userEvent.setup()
+    const handleClose = jest.fn()
+    
+    render(<Modal isOpen={true} onClose={handleClose} />)
+    
+    await user.click(screen.getByTestId('modal-overlay'))
+    
+    expect(handleClose).toHaveBeenCalled()
+  })
+
+  it('should call onClose when pressing Escape', async () => {
+    const user = userEvent.setup()
+    const handleClose = jest.fn()
+    
+    render(<Modal isOpen={true} onClose={handleClose} />)
+    
+    await user.keyboard('{Escape}')
+    
+    expect(handleClose).toHaveBeenCalled()
+  })
+
+  it('should trap focus inside modal', async () => {
+    const user = userEvent.setup()
+    
+    render(
+      <Modal isOpen={true} onClose={jest.fn()}>
+        <button>First</button>
+        <button>Second</button>
+      </Modal>
+    )
+    
+    // Focus should cycle within modal
+    await user.tab()
+    expect(screen.getByText('First')).toHaveFocus()
+    
+    await user.tab()
+    expect(screen.getByText('Second')).toHaveFocus()
+    
+    await user.tab()
+    expect(screen.getByText('First')).toHaveFocus() // Cycles back
+  })
+})
+```
+
+## Form Testing
+
+```typescript
+describe('LoginForm', () => {
+  it('should submit valid form', async () => {
+    const user = userEvent.setup()
+    const onSubmit = jest.fn()
+    
+    render(<LoginForm onSubmit={onSubmit} />)
+    
+    await user.type(screen.getByLabelText(/email/i), 'test@example.com')
+    await user.type(screen.getByLabelText(/password/i), 'password123')
+    await user.click(screen.getByRole('button', { name: /sign in/i }))
+    
+    expect(onSubmit).toHaveBeenCalledWith({
+      email: 'test@example.com',
+      password: 'password123',
+    })
+  })
+
+  it('should show validation errors', async () => {
+    const user = userEvent.setup()
+    
+    render(<LoginForm onSubmit={jest.fn()} />)
+    
+    // Submit empty form
+    await user.click(screen.getByRole('button', { name: /sign in/i }))
+    
+    expect(screen.getByText(/email is required/i)).toBeInTheDocument()
+    expect(screen.getByText(/password is required/i)).toBeInTheDocument()
+  })
+
+  it('should validate email format', async () => {
+    const user = userEvent.setup()
+    
+    render(<LoginForm onSubmit={jest.fn()} />)
+    
+    await user.type(screen.getByLabelText(/email/i), 'invalid-email')
+    await user.click(screen.getByRole('button', { name: /sign in/i }))
+    
+    expect(screen.getByText(/invalid email/i)).toBeInTheDocument()
+  })
+
+  it('should disable submit button while submitting', async () => {
+    const user = userEvent.setup()
+    const onSubmit = jest.fn(() => new Promise(resolve => setTimeout(resolve, 100)))
+    
+    render(<LoginForm onSubmit={onSubmit} />)
+    
+    await user.type(screen.getByLabelText(/email/i), 'test@example.com')
+    await user.type(screen.getByLabelText(/password/i), 'password123')
+    await user.click(screen.getByRole('button', { name: /sign in/i }))
+    
+    expect(screen.getByRole('button', { name: /signing in/i })).toBeDisabled()
+    
+    await waitFor(() => {
+      expect(screen.getByRole('button', { name: /sign in/i })).toBeEnabled()
+    })
+  })
+})
+```
+
+## Data-Driven Tests with test.each
+
+```typescript
+describe('StatusBadge', () => {
+  test.each([
+    ['success', 'bg-green-500'],
+    ['warning', 'bg-yellow-500'],
+    ['error', 'bg-red-500'],
+    ['info', 'bg-blue-500'],
+  ])('should apply correct class for %s status', (status, expectedClass) => {
+    render(<StatusBadge status={status} />)
+    
+    expect(screen.getByTestId('status-badge')).toHaveClass(expectedClass)
+  })
+
+  test.each([
+    { input: null, expected: 'Unknown' },
+    { input: undefined, expected: 'Unknown' },
+    { input: '', expected: 'Unknown' },
+    { input: 'invalid', expected: 'Unknown' },
+  ])('should show "Unknown" for invalid input: $input', ({ input, expected }) => {
+    render(<StatusBadge status={input} />)
+    
+    expect(screen.getByText(expected)).toBeInTheDocument()
+  })
+})
+```
+
+## Debugging Tips
+
+```typescript
+// Print entire DOM
+screen.debug()
+
+// Print specific element
+screen.debug(screen.getByRole('button'))
+
+// Log testing playground URL
+screen.logTestingPlaygroundURL()
+
+// Pretty print DOM
+import { prettyDOM } from '@testing-library/react'
+console.log(prettyDOM(screen.getByRole('dialog')))
+
+// Check available roles
+import { getRoles } from '@testing-library/react'
+console.log(getRoles(container))
+```
+
+## Common Mistakes to Avoid
+
+### ❌ Don't Use Implementation Details
+
+```typescript
+// Bad - testing implementation
+expect(component.state.isOpen).toBe(true)
+expect(wrapper.find('.internal-class').length).toBe(1)
+
+// Good - testing behavior
+expect(screen.getByRole('dialog')).toBeInTheDocument()
+```
+
+### ❌ Don't Forget Cleanup
+
+```typescript
+// Bad - may leak state between tests
+it('test 1', () => {
+  render(<Component />)
+})
+
+// Good - cleanup is automatic with RTL, but reset mocks
+beforeEach(() => {
+  jest.clearAllMocks()
+})
+```
+
+### ❌ Don't Use Exact String Matching (Prefer Black-Box Assertions)
+
+```typescript
+// ❌ Bad - hardcoded strings are brittle
+expect(screen.getByText('Submit Form')).toBeInTheDocument()
+expect(screen.getByText('Loading...')).toBeInTheDocument()
+
+// ✅ Good - role-based queries (most semantic)
+expect(screen.getByRole('button', { name: /submit/i })).toBeInTheDocument()
+expect(screen.getByRole('status')).toBeInTheDocument()
+
+// ✅ Good - pattern matching (flexible)
+expect(screen.getByText(/submit/i)).toBeInTheDocument()
+expect(screen.getByText(/loading/i)).toBeInTheDocument()
+
+// ✅ Good - test behavior, not exact UI text
+expect(screen.getByRole('button')).toBeDisabled()
+expect(screen.getByRole('alert')).toBeInTheDocument()
+```
+
+**Why prefer black-box assertions?**
+
+- Text content may change (i18n, copy updates)
+- Role-based queries test accessibility
+- Pattern matching is resilient to minor changes
+- Tests focus on behavior, not implementation details
+
+### ❌ Don't Assert on Absence Without Query
+
+```typescript
+// Bad - throws if not found
+expect(screen.getByText('Error')).not.toBeInTheDocument() // Error!
+
+// Good - use queryBy for absence assertions
+expect(screen.queryByText('Error')).not.toBeInTheDocument()
+```

.claude/skills/frontend-testing/guides/domain-components.md

@@ -0,0 +1,523 @@
+# Domain-Specific Component Testing
+
+This guide covers testing patterns for Dify's domain-specific components.
+
+## Workflow Components (`workflow/`)
+
+Workflow components handle node configuration, data flow, and graph operations.
+
+### Key Test Areas
+
+1. **Node Configuration**
+1. **Data Validation**
+1. **Variable Passing**
+1. **Edge Connections**
+1. **Error Handling**
+
+### Example: Node Configuration Panel
+
+```typescript
+import { render, screen, fireEvent, waitFor } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import NodeConfigPanel from './node-config-panel'
+import { createMockNode, createMockWorkflowContext } from '@/__mocks__/workflow'
+
+// Mock workflow context
+jest.mock('@/app/components/workflow/hooks', () => ({
+  useWorkflowStore: () => mockWorkflowStore,
+  useNodesInteractions: () => mockNodesInteractions,
+}))
+
+let mockWorkflowStore = {
+  nodes: [],
+  edges: [],
+  updateNode: jest.fn(),
+}
+
+let mockNodesInteractions = {
+  handleNodeSelect: jest.fn(),
+  handleNodeDelete: jest.fn(),
+}
+
+describe('NodeConfigPanel', () => {
+  beforeEach(() => {
+    jest.clearAllMocks()
+    mockWorkflowStore = {
+      nodes: [],
+      edges: [],
+      updateNode: jest.fn(),
+    }
+  })
+
+  describe('Node Configuration', () => {
+    it('should render node type selector', () => {
+      const node = createMockNode({ type: 'llm' })
+      render(<NodeConfigPanel node={node} />)
+      
+      expect(screen.getByLabelText(/model/i)).toBeInTheDocument()
+    })
+
+    it('should update node config on change', async () => {
+      const user = userEvent.setup()
+      const node = createMockNode({ type: 'llm' })
+      
+      render(<NodeConfigPanel node={node} />)
+      
+      await user.selectOptions(screen.getByLabelText(/model/i), 'gpt-4')
+      
+      expect(mockWorkflowStore.updateNode).toHaveBeenCalledWith(
+        node.id,
+        expect.objectContaining({ model: 'gpt-4' })
+      )
+    })
+  })
+
+  describe('Data Validation', () => {
+    it('should show error for invalid input', async () => {
+      const user = userEvent.setup()
+      const node = createMockNode({ type: 'code' })
+      
+      render(<NodeConfigPanel node={node} />)
+      
+      // Enter invalid code
+      const codeInput = screen.getByLabelText(/code/i)
+      await user.clear(codeInput)
+      await user.type(codeInput, 'invalid syntax {{{')
+      
+      await waitFor(() => {
+        expect(screen.getByText(/syntax error/i)).toBeInTheDocument()
+      })
+    })
+
+    it('should validate required fields', async () => {
+      const node = createMockNode({ type: 'http', data: { url: '' } })
+      
+      render(<NodeConfigPanel node={node} />)
+      
+      fireEvent.click(screen.getByRole('button', { name: /save/i }))
+      
+      await waitFor(() => {
+        expect(screen.getByText(/url is required/i)).toBeInTheDocument()
+      })
+    })
+  })
+
+  describe('Variable Passing', () => {
+    it('should display available variables from upstream nodes', () => {
+      const upstreamNode = createMockNode({
+        id: 'node-1',
+        type: 'start',
+        data: { outputs: [{ name: 'user_input', type: 'string' }] },
+      })
+      const currentNode = createMockNode({
+        id: 'node-2',
+        type: 'llm',
+      })
+      
+      mockWorkflowStore.nodes = [upstreamNode, currentNode]
+      mockWorkflowStore.edges = [{ source: 'node-1', target: 'node-2' }]
+      
+      render(<NodeConfigPanel node={currentNode} />)
+      
+      // Variable selector should show upstream variables
+      fireEvent.click(screen.getByRole('button', { name: /add variable/i }))
+      
+      expect(screen.getByText('user_input')).toBeInTheDocument()
+    })
+
+    it('should insert variable into prompt template', async () => {
+      const user = userEvent.setup()
+      const node = createMockNode({ type: 'llm' })
+      
+      render(<NodeConfigPanel node={node} />)
+      
+      // Click variable button
+      await user.click(screen.getByRole('button', { name: /insert variable/i }))
+      await user.click(screen.getByText('user_input'))
+      
+      const promptInput = screen.getByLabelText(/prompt/i)
+      expect(promptInput).toHaveValue(expect.stringContaining('{{user_input}}'))
+    })
+  })
+})
+```
+
+## Dataset Components (`dataset/`)
+
+Dataset components handle file uploads, data display, and search/filter operations.
+
+### Key Test Areas
+
+1. **File Upload**
+1. **File Type Validation**
+1. **Pagination**
+1. **Search & Filtering**
+1. **Data Format Handling**
+
+### Example: Document Uploader
+
+```typescript
+import { render, screen, fireEvent, waitFor } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import DocumentUploader from './document-uploader'
+
+jest.mock('@/service/datasets', () => ({
+  uploadDocument: jest.fn(),
+  parseDocument: jest.fn(),
+}))
+
+import * as datasetService from '@/service/datasets'
+const mockedService = datasetService as jest.Mocked<typeof datasetService>
+
+describe('DocumentUploader', () => {
+  beforeEach(() => {
+    jest.clearAllMocks()
+  })
+
+  describe('File Upload', () => {
+    it('should accept valid file types', async () => {
+      const user = userEvent.setup()
+      const onUpload = jest.fn()
+      mockedService.uploadDocument.mockResolvedValue({ id: 'doc-1' })
+      
+      render(<DocumentUploader onUpload={onUpload} />)
+      
+      const file = new File(['content'], 'test.pdf', { type: 'application/pdf' })
+      const input = screen.getByLabelText(/upload/i)
+      
+      await user.upload(input, file)
+      
+      await waitFor(() => {
+        expect(mockedService.uploadDocument).toHaveBeenCalledWith(
+          expect.any(FormData)
+        )
+      })
+    })
+
+    it('should reject invalid file types', async () => {
+      const user = userEvent.setup()
+      
+      render(<DocumentUploader />)
+      
+      const file = new File(['content'], 'test.exe', { type: 'application/x-msdownload' })
+      const input = screen.getByLabelText(/upload/i)
+      
+      await user.upload(input, file)
+      
+      expect(screen.getByText(/unsupported file type/i)).toBeInTheDocument()
+      expect(mockedService.uploadDocument).not.toHaveBeenCalled()
+    })
+
+    it('should show upload progress', async () => {
+      const user = userEvent.setup()
+      
+      // Mock upload with progress
+      mockedService.uploadDocument.mockImplementation(() => {
+        return new Promise((resolve) => {
+          setTimeout(() => resolve({ id: 'doc-1' }), 100)
+        })
+      })
+      
+      render(<DocumentUploader />)
+      
+      const file = new File(['content'], 'test.pdf', { type: 'application/pdf' })
+      await user.upload(screen.getByLabelText(/upload/i), file)
+      
+      expect(screen.getByRole('progressbar')).toBeInTheDocument()
+      
+      await waitFor(() => {
+        expect(screen.queryByRole('progressbar')).not.toBeInTheDocument()
+      })
+    })
+  })
+
+  describe('Error Handling', () => {
+    it('should handle upload failure', async () => {
+      const user = userEvent.setup()
+      mockedService.uploadDocument.mockRejectedValue(new Error('Upload failed'))
+      
+      render(<DocumentUploader />)
+      
+      const file = new File(['content'], 'test.pdf', { type: 'application/pdf' })
+      await user.upload(screen.getByLabelText(/upload/i), file)
+      
+      await waitFor(() => {
+        expect(screen.getByText(/upload failed/i)).toBeInTheDocument()
+      })
+    })
+
+    it('should allow retry after failure', async () => {
+      const user = userEvent.setup()
+      mockedService.uploadDocument
+        .mockRejectedValueOnce(new Error('Network error'))
+        .mockResolvedValueOnce({ id: 'doc-1' })
+      
+      render(<DocumentUploader />)
+      
+      const file = new File(['content'], 'test.pdf', { type: 'application/pdf' })
+      await user.upload(screen.getByLabelText(/upload/i), file)
+      
+      await waitFor(() => {
+        expect(screen.getByRole('button', { name: /retry/i })).toBeInTheDocument()
+      })
+      
+      await user.click(screen.getByRole('button', { name: /retry/i }))
+      
+      await waitFor(() => {
+        expect(screen.getByText(/uploaded successfully/i)).toBeInTheDocument()
+      })
+    })
+  })
+})
+```
+
+### Example: Document List with Pagination
+
+```typescript
+describe('DocumentList', () => {
+  describe('Pagination', () => {
+    it('should load first page on mount', async () => {
+      mockedService.getDocuments.mockResolvedValue({
+        data: [{ id: '1', name: 'Doc 1' }],
+        total: 50,
+        page: 1,
+        pageSize: 10,
+      })
+      
+      render(<DocumentList datasetId="ds-1" />)
+      
+      await waitFor(() => {
+        expect(screen.getByText('Doc 1')).toBeInTheDocument()
+      })
+      
+      expect(mockedService.getDocuments).toHaveBeenCalledWith('ds-1', { page: 1 })
+    })
+
+    it('should navigate to next page', async () => {
+      const user = userEvent.setup()
+      mockedService.getDocuments.mockResolvedValue({
+        data: [{ id: '1', name: 'Doc 1' }],
+        total: 50,
+        page: 1,
+        pageSize: 10,
+      })
+      
+      render(<DocumentList datasetId="ds-1" />)
+      
+      await waitFor(() => {
+        expect(screen.getByText('Doc 1')).toBeInTheDocument()
+      })
+      
+      mockedService.getDocuments.mockResolvedValue({
+        data: [{ id: '11', name: 'Doc 11' }],
+        total: 50,
+        page: 2,
+        pageSize: 10,
+      })
+      
+      await user.click(screen.getByRole('button', { name: /next/i }))
+      
+      await waitFor(() => {
+        expect(screen.getByText('Doc 11')).toBeInTheDocument()
+      })
+    })
+  })
+
+  describe('Search & Filtering', () => {
+    it('should filter by search query', async () => {
+      const user = userEvent.setup()
+      jest.useFakeTimers()
+      
+      render(<DocumentList datasetId="ds-1" />)
+      
+      await user.type(screen.getByPlaceholderText(/search/i), 'test query')
+      
+      // Debounce
+      jest.advanceTimersByTime(300)
+      
+      await waitFor(() => {
+        expect(mockedService.getDocuments).toHaveBeenCalledWith(
+          'ds-1',
+          expect.objectContaining({ search: 'test query' })
+        )
+      })
+      
+      jest.useRealTimers()
+    })
+  })
+})
+```
+
+## Configuration Components (`app/configuration/`, `config/`)
+
+Configuration components handle forms, validation, and data persistence.
+
+### Key Test Areas
+
+1. **Form Validation**
+1. **Save/Reset**
+1. **Required vs Optional Fields**
+1. **Configuration Persistence**
+1. **Error Feedback**
+
+### Example: App Configuration Form
+
+```typescript
+import { render, screen, fireEvent, waitFor } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import AppConfigForm from './app-config-form'
+
+jest.mock('@/service/apps', () => ({
+  updateAppConfig: jest.fn(),
+  getAppConfig: jest.fn(),
+}))
+
+import * as appService from '@/service/apps'
+const mockedService = appService as jest.Mocked<typeof appService>
+
+describe('AppConfigForm', () => {
+  const defaultConfig = {
+    name: 'My App',
+    description: '',
+    icon: 'default',
+    openingStatement: '',
+  }
+
+  beforeEach(() => {
+    jest.clearAllMocks()
+    mockedService.getAppConfig.mockResolvedValue(defaultConfig)
+  })
+
+  describe('Form Validation', () => {
+    it('should require app name', async () => {
+      const user = userEvent.setup()
+      
+      render(<AppConfigForm appId="app-1" />)
+      
+      await waitFor(() => {
+        expect(screen.getByLabelText(/name/i)).toHaveValue('My App')
+      })
+      
+      // Clear name field
+      await user.clear(screen.getByLabelText(/name/i))
+      await user.click(screen.getByRole('button', { name: /save/i }))
+      
+      expect(screen.getByText(/name is required/i)).toBeInTheDocument()
+      expect(mockedService.updateAppConfig).not.toHaveBeenCalled()
+    })
+
+    it('should validate name length', async () => {
+      const user = userEvent.setup()
+      
+      render(<AppConfigForm appId="app-1" />)
+      
+      await waitFor(() => {
+        expect(screen.getByLabelText(/name/i)).toBeInTheDocument()
+      })
+      
+      // Enter very long name
+      await user.clear(screen.getByLabelText(/name/i))
+      await user.type(screen.getByLabelText(/name/i), 'a'.repeat(101))
+      
+      expect(screen.getByText(/name must be less than 100 characters/i)).toBeInTheDocument()
+    })
+
+    it('should allow empty optional fields', async () => {
+      const user = userEvent.setup()
+      mockedService.updateAppConfig.mockResolvedValue({ success: true })
+      
+      render(<AppConfigForm appId="app-1" />)
+      
+      await waitFor(() => {
+        expect(screen.getByLabelText(/name/i)).toHaveValue('My App')
+      })
+      
+      // Leave description empty (optional)
+      await user.click(screen.getByRole('button', { name: /save/i }))
+      
+      await waitFor(() => {
+        expect(mockedService.updateAppConfig).toHaveBeenCalled()
+      })
+    })
+  })
+
+  describe('Save/Reset Functionality', () => {
+    it('should save configuration', async () => {
+      const user = userEvent.setup()
+      mockedService.updateAppConfig.mockResolvedValue({ success: true })
+      
+      render(<AppConfigForm appId="app-1" />)
+      
+      await waitFor(() => {
+        expect(screen.getByLabelText(/name/i)).toHaveValue('My App')
+      })
+      
+      await user.clear(screen.getByLabelText(/name/i))
+      await user.type(screen.getByLabelText(/name/i), 'Updated App')
+      await user.click(screen.getByRole('button', { name: /save/i }))
+      
+      await waitFor(() => {
+        expect(mockedService.updateAppConfig).toHaveBeenCalledWith(
+          'app-1',
+          expect.objectContaining({ name: 'Updated App' })
+        )
+      })
+      
+      expect(screen.getByText(/saved successfully/i)).toBeInTheDocument()
+    })
+
+    it('should reset to default values', async () => {
+      const user = userEvent.setup()
+      
+      render(<AppConfigForm appId="app-1" />)
+      
+      await waitFor(() => {
+        expect(screen.getByLabelText(/name/i)).toHaveValue('My App')
+      })
+      
+      // Make changes
+      await user.clear(screen.getByLabelText(/name/i))
+      await user.type(screen.getByLabelText(/name/i), 'Changed Name')
+      
+      // Reset
+      await user.click(screen.getByRole('button', { name: /reset/i }))
+      
+      expect(screen.getByLabelText(/name/i)).toHaveValue('My App')
+    })
+
+    it('should show unsaved changes warning', async () => {
+      const user = userEvent.setup()
+      
+      render(<AppConfigForm appId="app-1" />)
+      
+      await waitFor(() => {
+        expect(screen.getByLabelText(/name/i)).toHaveValue('My App')
+      })
+      
+      // Make changes
+      await user.type(screen.getByLabelText(/name/i), ' Updated')
+      
+      expect(screen.getByText(/unsaved changes/i)).toBeInTheDocument()
+    })
+  })
+
+  describe('Error Handling', () => {
+    it('should show error on save failure', async () => {
+      const user = userEvent.setup()
+      mockedService.updateAppConfig.mockRejectedValue(new Error('Server error'))
+      
+      render(<AppConfigForm appId="app-1" />)
+      
+      await waitFor(() => {
+        expect(screen.getByLabelText(/name/i)).toHaveValue('My App')
+      })
+      
+      await user.click(screen.getByRole('button', { name: /save/i }))
+      
+      await waitFor(() => {
+        expect(screen.getByText(/failed to save/i)).toBeInTheDocument()
+      })
+    })
+  })
+})
+```

.claude/skills/frontend-testing/guides/mocking.md

@@ -0,0 +1,353 @@
+# Mocking Guide for Dify Frontend Tests
+
+## ⚠️ Important: What NOT to Mock
+
+### DO NOT Mock Base Components
+
+**Never mock components from `@/app/components/base/`** such as:
+
+- `Loading`, `Spinner`
+- `Button`, `Input`, `Select`
+- `Tooltip`, `Modal`, `Dropdown`
+- `Icon`, `Badge`, `Tag`
+
+**Why?**
+
+- Base components will have their own dedicated tests
+- Mocking them creates false positives (tests pass but real integration fails)
+- Using real components tests actual integration behavior
+
+```typescript
+// ❌ WRONG: Don't mock base components
+jest.mock('@/app/components/base/loading', () => () => <div>Loading</div>)
+jest.mock('@/app/components/base/button', () => ({ children }: any) => <button>{children}</button>)
+
+// ✅ CORRECT: Import and use real base components
+import Loading from '@/app/components/base/loading'
+import Button from '@/app/components/base/button'
+// They will render normally in tests
+```
+
+### What TO Mock
+
+Only mock these categories:
+
+1. **API services** (`@/service/*`) - Network calls
+1. **Complex context providers** - When setup is too difficult
+1. **Third-party libraries with side effects** - `next/navigation`, external SDKs
+1. **i18n** - Always mock to return keys
+
+## Mock Placement
+
+| Location | Purpose |
+|----------|---------|
+| `web/__mocks__/` | Reusable mocks shared across multiple test files |
+| Test file | Test-specific mocks, inline with `jest.mock()` |
+
+## Essential Mocks
+
+### 1. i18n (Always Required)
+
+```typescript
+jest.mock('react-i18next', () => ({
+  useTranslation: () => ({
+    t: (key: string) => key,
+  }),
+}))
+```
+
+### 2. Next.js Router
+
+```typescript
+const mockPush = jest.fn()
+const mockReplace = jest.fn()
+
+jest.mock('next/navigation', () => ({
+  useRouter: () => ({
+    push: mockPush,
+    replace: mockReplace,
+    back: jest.fn(),
+    prefetch: jest.fn(),
+  }),
+  usePathname: () => '/current-path',
+  useSearchParams: () => new URLSearchParams('?key=value'),
+}))
+
+describe('Component', () => {
+  beforeEach(() => {
+    jest.clearAllMocks()
+  })
+
+  it('should navigate on click', () => {
+    render(<Component />)
+    fireEvent.click(screen.getByRole('button'))
+    expect(mockPush).toHaveBeenCalledWith('/expected-path')
+  })
+})
+```
+
+### 3. Portal Components (with Shared State)
+
+```typescript
+// ⚠️ Important: Use shared state for components that depend on each other
+let mockPortalOpenState = false
+
+jest.mock('@/app/components/base/portal-to-follow-elem', () => ({
+  PortalToFollowElem: ({ children, open, ...props }: any) => {
+    mockPortalOpenState = open || false  // Update shared state
+    return <div data-testid="portal" data-open={open}>{children}</div>
+  },
+  PortalToFollowElemContent: ({ children }: any) => {
+    // ✅ Matches actual: returns null when portal is closed
+    if (!mockPortalOpenState) return null
+    return <div data-testid="portal-content">{children}</div>
+  },
+  PortalToFollowElemTrigger: ({ children }: any) => (
+    <div data-testid="portal-trigger">{children}</div>
+  ),
+}))
+
+describe('Component', () => {
+  beforeEach(() => {
+    jest.clearAllMocks()
+    mockPortalOpenState = false  // ✅ Reset shared state
+  })
+})
+```
+
+### 4. API Service Mocks
+
+```typescript
+import * as api from '@/service/api'
+
+jest.mock('@/service/api')
+
+const mockedApi = api as jest.Mocked<typeof api>
+
+describe('Component', () => {
+  beforeEach(() => {
+    jest.clearAllMocks()
+    
+    // Setup default mock implementation
+    mockedApi.fetchData.mockResolvedValue({ data: [] })
+  })
+
+  it('should show data on success', async () => {
+    mockedApi.fetchData.mockResolvedValue({ data: [{ id: 1 }] })
+    
+    render(<Component />)
+    
+    await waitFor(() => {
+      expect(screen.getByText('1')).toBeInTheDocument()
+    })
+  })
+
+  it('should show error on failure', async () => {
+    mockedApi.fetchData.mockRejectedValue(new Error('Network error'))
+    
+    render(<Component />)
+    
+    await waitFor(() => {
+      expect(screen.getByText(/error/i)).toBeInTheDocument()
+    })
+  })
+})
+```
+
+### 5. HTTP Mocking with Nock
+
+```typescript
+import nock from 'nock'
+
+const GITHUB_HOST = 'https://api.github.com'
+const GITHUB_PATH = '/repos/owner/repo'
+
+const mockGithubApi = (status: number, body: Record<string, unknown>, delayMs = 0) => {
+  return nock(GITHUB_HOST)
+    .get(GITHUB_PATH)
+    .delay(delayMs)
+    .reply(status, body)
+}
+
+describe('GithubComponent', () => {
+  afterEach(() => {
+    nock.cleanAll()
+  })
+
+  it('should display repo info', async () => {
+    mockGithubApi(200, { name: 'dify', stars: 1000 })
+    
+    render(<GithubComponent />)
+    
+    await waitFor(() => {
+      expect(screen.getByText('dify')).toBeInTheDocument()
+    })
+  })
+
+  it('should handle API error', async () => {
+    mockGithubApi(500, { message: 'Server error' })
+    
+    render(<GithubComponent />)
+    
+    await waitFor(() => {
+      expect(screen.getByText(/error/i)).toBeInTheDocument()
+    })
+  })
+})
+```
+
+### 6. Context Providers
+
+```typescript
+import { ProviderContext } from '@/context/provider-context'
+import { createMockProviderContextValue, createMockPlan } from '@/__mocks__/provider-context'
+
+describe('Component with Context', () => {
+  it('should render for free plan', () => {
+    const mockContext = createMockPlan('sandbox')
+    
+    render(
+      <ProviderContext.Provider value={mockContext}>
+        <Component />
+      </ProviderContext.Provider>
+    )
+    
+    expect(screen.getByText('Upgrade')).toBeInTheDocument()
+  })
+
+  it('should render for pro plan', () => {
+    const mockContext = createMockPlan('professional')
+    
+    render(
+      <ProviderContext.Provider value={mockContext}>
+        <Component />
+      </ProviderContext.Provider>
+    )
+    
+    expect(screen.queryByText('Upgrade')).not.toBeInTheDocument()
+  })
+})
+```
+
+### 7. SWR / React Query
+
+```typescript
+// SWR
+jest.mock('swr', () => ({
+  __esModule: true,
+  default: jest.fn(),
+}))
+
+import useSWR from 'swr'
+const mockedUseSWR = useSWR as jest.Mock
+
+describe('Component with SWR', () => {
+  it('should show loading state', () => {
+    mockedUseSWR.mockReturnValue({
+      data: undefined,
+      error: undefined,
+      isLoading: true,
+    })
+    
+    render(<Component />)
+    expect(screen.getByText(/loading/i)).toBeInTheDocument()
+  })
+})
+
+// React Query
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
+
+const createTestQueryClient = () => new QueryClient({
+  defaultOptions: {
+    queries: { retry: false },
+    mutations: { retry: false },
+  },
+})
+
+const renderWithQueryClient = (ui: React.ReactElement) => {
+  const queryClient = createTestQueryClient()
+  return render(
+    <QueryClientProvider client={queryClient}>
+      {ui}
+    </QueryClientProvider>
+  )
+}
+```
+
+## Mock Best Practices
+
+### ✅ DO
+
+1. **Use real base components** - Import from `@/app/components/base/` directly
+1. **Use real project components** - Prefer importing over mocking
+1. **Reset mocks in `beforeEach`**, not `afterEach`
+1. **Match actual component behavior** in mocks (when mocking is necessary)
+1. **Use factory functions** for complex mock data
+1. **Import actual types** for type safety
+1. **Reset shared mock state** in `beforeEach`
+
+### ❌ DON'T
+
+1. **Don't mock base components** (`Loading`, `Button`, `Tooltip`, etc.)
+1. Don't mock components you can import directly
+1. Don't create overly simplified mocks that miss conditional logic
+1. Don't forget to clean up nock after each test
+1. Don't use `any` types in mocks without necessity
+
+### Mock Decision Tree
+
+```
+Need to use a component in test?
+│
+├─ Is it from @/app/components/base/*?
+│  └─ YES → Import real component, DO NOT mock
+│
+├─ Is it a project component?
+│  └─ YES → Prefer importing real component
+│           Only mock if setup is extremely complex
+│
+├─ Is it an API service (@/service/*)?
+│  └─ YES → Mock it
+│
+├─ Is it a third-party lib with side effects?
+│  └─ YES → Mock it (next/navigation, external SDKs)
+│
+└─ Is it i18n?
+   └─ YES → Mock to return keys
+```
+
+## Factory Function Pattern
+
+```typescript
+// __mocks__/data-factories.ts
+import type { User, Project } from '@/types'
+
+export const createMockUser = (overrides: Partial<User> = {}): User => ({
+  id: 'user-1',
+  name: 'Test User',
+  email: 'test@example.com',
+  role: 'member',
+  createdAt: new Date().toISOString(),
+  ...overrides,
+})
+
+export const createMockProject = (overrides: Partial<Project> = {}): Project => ({
+  id: 'project-1',
+  name: 'Test Project',
+  description: 'A test project',
+  owner: createMockUser(),
+  members: [],
+  createdAt: new Date().toISOString(),
+  ...overrides,
+})
+
+// Usage in tests
+it('should display project owner', () => {
+  const project = createMockProject({
+    owner: createMockUser({ name: 'John Doe' }),
+  })
+  
+  render(<ProjectCard project={project} />)
+  expect(screen.getByText('John Doe')).toBeInTheDocument()
+})
+```

.claude/skills/frontend-testing/guides/workflow.md

@@ -0,0 +1,269 @@
+# Testing Workflow Guide
+
+This guide defines the workflow for generating tests, especially for complex components or directories with multiple files.
+
+## Scope Clarification
+
+This guide addresses **multi-file workflow** (how to process multiple test files). For coverage requirements within a single test file, see `web/testing/testing.md` § Coverage Goals.
+
+| Scope | Rule |
+|-------|------|
+| **Single file** | Complete coverage in one generation (100% function, >95% branch) |
+| **Multi-file directory** | Process one file at a time, verify each before proceeding |
+
+## ⚠️ Critical Rule: Incremental Approach for Multi-File Testing
+
+When testing a **directory with multiple files**, **NEVER generate all test files at once.** Use an incremental, verify-as-you-go approach.
+
+### Why Incremental?
+
+| Batch Approach (❌) | Incremental Approach (✅) |
+|---------------------|---------------------------|
+| Generate 5+ tests at once | Generate 1 test at a time |
+| Run tests only at the end | Run test immediately after each file |
+| Multiple failures compound | Single point of failure, easy to debug |
+| Hard to identify root cause | Clear cause-effect relationship |
+| Mock issues affect many files | Mock issues caught early |
+| Messy git history | Clean, atomic commits possible |
+
+## Single File Workflow
+
+When testing a **single component, hook, or utility**:
+
+```
+1. Read source code completely
+2. Run `pnpm analyze-component <path>` (if available)
+3. Check complexity score and features detected
+4. Write the test file
+5. Run test: `pnpm test -- <file>.spec.tsx`
+6. Fix any failures
+7. Verify coverage meets goals (100% function, >95% branch)
+```
+
+## Directory/Multi-File Workflow (MUST FOLLOW)
+
+When testing a **directory or multiple files**, follow this strict workflow:
+
+### Step 1: Analyze and Plan
+
+1. **List all files** that need tests in the directory
+1. **Categorize by complexity**:
+   - 🟢 **Simple**: Utility functions, simple hooks, presentational components
+   - 🟡 **Medium**: Components with state, effects, or event handlers
+   - 🔴 **Complex**: Components with API calls, routing, or many dependencies
+1. **Order by dependency**: Test dependencies before dependents
+1. **Create a todo list** to track progress
+
+### Step 2: Determine Processing Order
+
+Process files in this recommended order:
+
+```
+1. Utility functions (simplest, no React)
+2. Custom hooks (isolated logic)
+3. Simple presentational components (few/no props)
+4. Medium complexity components (state, effects)
+5. Complex components (API, routing, many deps)
+6. Container/index components (integration tests - last)
+```
+
+**Rationale**:
+
+- Simpler files help establish mock patterns
+- Hooks used by components should be tested first
+- Integration tests (index files) depend on child components working
+
+### Step 3: Process Each File Incrementally
+
+**For EACH file in the ordered list:**
+
+```
+┌─────────────────────────────────────────────┐
+│  1. Write test file                         │
+│  2. Run: pnpm test -- <file>.spec.tsx       │
+│  3. If FAIL → Fix immediately, re-run       │
+│  4. If PASS → Mark complete in todo list    │
+│  5. ONLY THEN proceed to next file          │
+└─────────────────────────────────────────────┘
+```
+
+**DO NOT proceed to the next file until the current one passes.**
+
+### Step 4: Final Verification
+
+After all individual tests pass:
+
+```bash
+# Run all tests in the directory together
+pnpm test -- path/to/directory/
+
+# Check coverage
+pnpm test -- --coverage path/to/directory/
+```
+
+## Component Complexity Guidelines
+
+Use `pnpm analyze-component <path>` to assess complexity before testing.
+
+### 🔴 Very Complex Components (Complexity > 50)
+
+**Consider refactoring BEFORE testing:**
+
+- Break component into smaller, testable pieces
+- Extract complex logic into custom hooks
+- Separate container and presentational layers
+
+**If testing as-is:**
+
+- Use integration tests for complex workflows
+- Use `test.each()` for data-driven testing
+- Multiple `describe` blocks for organization
+- Consider testing major sections separately
+
+### 🟡 Medium Complexity (Complexity 30-50)
+
+- Group related tests in `describe` blocks
+- Test integration scenarios between internal parts
+- Focus on state transitions and side effects
+- Use helper functions to reduce test complexity
+
+### 🟢 Simple Components (Complexity < 30)
+
+- Standard test structure
+- Focus on props, rendering, and edge cases
+- Usually straightforward to test
+
+### 📏 Large Files (500+ lines)
+
+Regardless of complexity score:
+
+- **Strongly consider refactoring** before testing
+- If testing as-is, test major sections separately
+- Create helper functions for test setup
+- May need multiple test files
+
+## Todo List Format
+
+When testing multiple files, use a todo list like this:
+
+```
+Testing: path/to/directory/
+
+Ordered by complexity (simple → complex):
+
+☐ utils/helper.ts           [utility, simple]
+☐ hooks/use-custom-hook.ts  [hook, simple]
+☐ empty-state.tsx           [component, simple]
+☐ item-card.tsx             [component, medium]
+☐ list.tsx                  [component, complex]
+☐ index.tsx                 [integration]
+
+Progress: 0/6 complete
+```
+
+Update status as you complete each:
+
+- ☐ → ⏳ (in progress)
+- ⏳ → ✅ (complete and verified)
+- ⏳ → ❌ (blocked, needs attention)
+
+## When to Stop and Verify
+
+**Always run tests after:**
+
+- Completing a test file
+- Making changes to fix a failure
+- Modifying shared mocks
+- Updating test utilities or helpers
+
+**Signs you should pause:**
+
+- More than 2 consecutive test failures
+- Mock-related errors appearing
+- Unclear why a test is failing
+- Test passing but coverage unexpectedly low
+
+## Common Pitfalls to Avoid
+
+### ❌ Don't: Generate Everything First
+
+```
+# BAD: Writing all files then testing
+Write component-a.spec.tsx
+Write component-b.spec.tsx  
+Write component-c.spec.tsx
+Write component-d.spec.tsx
+Run pnpm test  ← Multiple failures, hard to debug
+```
+
+### ✅ Do: Verify Each Step
+
+```
+# GOOD: Incremental with verification
+Write component-a.spec.tsx
+Run pnpm test -- component-a.spec.tsx ✅
+Write component-b.spec.tsx
+Run pnpm test -- component-b.spec.tsx ✅
+...continue...
+```
+
+### ❌ Don't: Skip Verification for "Simple" Components
+
+Even simple components can have:
+
+- Import errors
+- Missing mock setup
+- Incorrect assumptions about props
+
+**Always verify, regardless of perceived simplicity.**
+
+### ❌ Don't: Continue When Tests Fail
+
+Failing tests compound:
+
+- A mock issue in file A affects files B, C, D
+- Fixing A later requires revisiting all dependent tests
+- Time wasted on debugging cascading failures
+
+**Fix failures immediately before proceeding.**
+
+## Integration with Claude's Todo Feature
+
+When using Claude for multi-file testing:
+
+1. **Ask Claude to create a todo list** before starting
+1. **Request one file at a time** or ensure Claude processes incrementally
+1. **Verify each test passes** before asking for the next
+1. **Mark todos complete** as you progress
+
+Example prompt:
+
+```
+Test all components in `path/to/directory/`.
+First, analyze the directory and create a todo list ordered by complexity.
+Then, process ONE file at a time, waiting for my confirmation that tests pass
+before proceeding to the next.
+```
+
+## Summary Checklist
+
+Before starting multi-file testing:
+
+- [ ] Listed all files needing tests
+- [ ] Ordered by complexity (simple → complex)
+- [ ] Created todo list for tracking
+- [ ] Understand dependencies between files
+
+During testing:
+
+- [ ] Processing ONE file at a time
+- [ ] Running tests after EACH file
+- [ ] Fixing failures BEFORE proceeding
+- [ ] Updating todo list progress
+
+After completion:
+
+- [ ] All individual tests pass
+- [ ] Full directory test run passes
+- [ ] Coverage goals met
+- [ ] Todo list shows all complete

.claude/skills/frontend-testing/templates/component-test.template.tsx

@@ -0,0 +1,289 @@
+/**
+ * Test Template for React Components
+ *
+ * WHY THIS STRUCTURE?
+ * - Organized sections make tests easy to navigate and maintain
+ * - Mocks at top ensure consistent test isolation
+ * - Factory functions reduce duplication and improve readability
+ * - describe blocks group related scenarios for better debugging
+ *
+ * INSTRUCTIONS:
+ * 1. Replace `ComponentName` with your component name
+ * 2. Update import path
+ * 3. Add/remove test sections based on component features (use analyze-component)
+ * 4. Follow AAA pattern: Arrange → Act → Assert
+ *
+ * RUN FIRST: pnpm analyze-component <path> to identify required test scenarios
+ */
+
+import { render, screen, fireEvent, waitFor } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+// import ComponentName from './index'
+
+// ============================================================================
+// Mocks
+// ============================================================================
+// WHY: Mocks must be hoisted to top of file (Jest requirement).
+// They run BEFORE imports, so keep them before component imports.
+
+// i18n (always required in Dify)
+// WHY: Returns key instead of translation so tests don't depend on i18n files
+jest.mock('react-i18next', () => ({
+  useTranslation: () => ({
+    t: (key: string) => key,
+  }),
+}))
+
+// Router (if component uses useRouter, usePathname, useSearchParams)
+// WHY: Isolates tests from Next.js routing, enables testing navigation behavior
+// const mockPush = jest.fn()
+// jest.mock('next/navigation', () => ({
+//   useRouter: () => ({ push: mockPush }),
+//   usePathname: () => '/test-path',
+// }))
+
+// API services (if component fetches data)
+// WHY: Prevents real network calls, enables testing all states (loading/success/error)
+// jest.mock('@/service/api')
+// import * as api from '@/service/api'
+// const mockedApi = api as jest.Mocked<typeof api>
+
+// Shared mock state (for portal/dropdown components)
+// WHY: Portal components like PortalToFollowElem need shared state between
+// parent and child mocks to correctly simulate open/close behavior
+// let mockOpenState = false
+
+// ============================================================================
+// Test Data Factories
+// ============================================================================
+// WHY FACTORIES?
+// - Avoid hard-coded test data scattered across tests
+// - Easy to create variations with overrides
+// - Type-safe when using actual types from source
+// - Single source of truth for default test values
+
+// const createMockProps = (overrides = {}) => ({
+//   // Default props that make component render successfully
+//   ...overrides,
+// })
+
+// const createMockItem = (overrides = {}) => ({
+//   id: 'item-1',
+//   name: 'Test Item',
+//   ...overrides,
+// })
+
+// ============================================================================
+// Test Helpers
+// ============================================================================
+
+// const renderComponent = (props = {}) => {
+//   return render(<ComponentName {...createMockProps(props)} />)
+// }
+
+// ============================================================================
+// Tests
+// ============================================================================
+
+describe('ComponentName', () => {
+  // WHY beforeEach with clearAllMocks?
+  // - Ensures each test starts with clean slate
+  // - Prevents mock call history from leaking between tests
+  // - MUST be beforeEach (not afterEach) to reset BEFORE assertions like toHaveBeenCalledTimes
+  beforeEach(() => {
+    jest.clearAllMocks()
+    // Reset shared mock state if used (CRITICAL for portal/dropdown tests)
+    // mockOpenState = false
+  })
+
+  // --------------------------------------------------------------------------
+  // Rendering Tests (REQUIRED - Every component MUST have these)
+  // --------------------------------------------------------------------------
+  // WHY: Catches import errors, missing providers, and basic render issues
+  describe('Rendering', () => {
+    it('should render without crashing', () => {
+      // Arrange - Setup data and mocks
+      // const props = createMockProps()
+
+      // Act - Render the component
+      // render(<ComponentName {...props} />)
+
+      // Assert - Verify expected output
+      // Prefer getByRole for accessibility; it's what users "see"
+      // expect(screen.getByRole('...')).toBeInTheDocument()
+    })
+
+    it('should render with default props', () => {
+      // WHY: Verifies component works without optional props
+      // render(<ComponentName />)
+      // expect(screen.getByText('...')).toBeInTheDocument()
+    })
+  })
+
+  // --------------------------------------------------------------------------
+  // Props Tests (REQUIRED - Every component MUST test prop behavior)
+  // --------------------------------------------------------------------------
+  // WHY: Props are the component's API contract. Test them thoroughly.
+  describe('Props', () => {
+    it('should apply custom className', () => {
+      // WHY: Common pattern in Dify - components should merge custom classes
+      // render(<ComponentName className="custom-class" />)
+      // expect(screen.getByTestId('component')).toHaveClass('custom-class')
+    })
+
+    it('should use default values for optional props', () => {
+      // WHY: Verifies TypeScript defaults work at runtime
+      // render(<ComponentName />)
+      // expect(screen.getByRole('...')).toHaveAttribute('...', 'default-value')
+    })
+  })
+
+  // --------------------------------------------------------------------------
+  // User Interactions (if component has event handlers - on*, handle*)
+  // --------------------------------------------------------------------------
+  // WHY: Event handlers are core functionality. Test from user's perspective.
+  describe('User Interactions', () => {
+    it('should call onClick when clicked', async () => {
+      // WHY userEvent over fireEvent?
+      // - userEvent simulates real user behavior (focus, hover, then click)
+      // - fireEvent is lower-level, doesn't trigger all browser events
+      // const user = userEvent.setup()
+      // const handleClick = jest.fn()
+      // render(<ComponentName onClick={handleClick} />)
+      //
+      // await user.click(screen.getByRole('button'))
+      //
+      // expect(handleClick).toHaveBeenCalledTimes(1)
+    })
+
+    it('should call onChange when value changes', async () => {
+      // const user = userEvent.setup()
+      // const handleChange = jest.fn()
+      // render(<ComponentName onChange={handleChange} />)
+      //
+      // await user.type(screen.getByRole('textbox'), 'new value')
+      //
+      // expect(handleChange).toHaveBeenCalled()
+    })
+  })
+
+  // --------------------------------------------------------------------------
+  // State Management (if component uses useState/useReducer)
+  // --------------------------------------------------------------------------
+  // WHY: Test state through observable UI changes, not internal state values
+  describe('State Management', () => {
+    it('should update state on interaction', async () => {
+      // WHY test via UI, not state?
+      // - State is implementation detail; UI is what users see
+      // - If UI works correctly, state must be correct
+      // const user = userEvent.setup()
+      // render(<ComponentName />)
+      //
+      // // Initial state - verify what user sees
+      // expect(screen.getByText('Initial')).toBeInTheDocument()
+      //
+      // // Trigger state change via user action
+      // await user.click(screen.getByRole('button'))
+      //
+      // // New state - verify UI updated
+      // expect(screen.getByText('Updated')).toBeInTheDocument()
+    })
+  })
+
+  // --------------------------------------------------------------------------
+  // Async Operations (if component fetches data - useSWR, useQuery, fetch)
+  // --------------------------------------------------------------------------
+  // WHY: Async operations have 3 states users experience: loading, success, error
+  describe('Async Operations', () => {
+    it('should show loading state', () => {
+      // WHY never-resolving promise?
+      // - Keeps component in loading state for assertion
+      // - Alternative: use fake timers
+      // mockedApi.fetchData.mockImplementation(() => new Promise(() => {}))
+      // render(<ComponentName />)
+      //
+      // expect(screen.getByText(/loading/i)).toBeInTheDocument()
+    })
+
+    it('should show data on success', async () => {
+      // WHY waitFor?
+      // - Component updates asynchronously after fetch resolves
+      // - waitFor retries assertion until it passes or times out
+      // mockedApi.fetchData.mockResolvedValue({ items: ['Item 1'] })
+      // render(<ComponentName />)
+      //
+      // await waitFor(() => {
+      //   expect(screen.getByText('Item 1')).toBeInTheDocument()
+      // })
+    })
+
+    it('should show error on failure', async () => {
+      // mockedApi.fetchData.mockRejectedValue(new Error('Network error'))
+      // render(<ComponentName />)
+      //
+      // await waitFor(() => {
+      //   expect(screen.getByText(/error/i)).toBeInTheDocument()
+      // })
+    })
+  })
+
+  // --------------------------------------------------------------------------
+  // Edge Cases (REQUIRED - Every component MUST handle edge cases)
+  // --------------------------------------------------------------------------
+  // WHY: Real-world data is messy. Components must handle:
+  // - Null/undefined from API failures or optional fields
+  // - Empty arrays/strings from user clearing data
+  // - Boundary values (0, MAX_INT, special characters)
+  describe('Edge Cases', () => {
+    it('should handle null value', () => {
+      // WHY test null specifically?
+      // - API might return null for missing data
+      // - Prevents "Cannot read property of null" in production
+      // render(<ComponentName value={null} />)
+      // expect(screen.getByText(/no data/i)).toBeInTheDocument()
+    })
+
+    it('should handle undefined value', () => {
+      // WHY test undefined separately from null?
+      // - TypeScript treats them differently
+      // - Optional props are undefined, not null
+      // render(<ComponentName value={undefined} />)
+      // expect(screen.getByText(/no data/i)).toBeInTheDocument()
+    })
+
+    it('should handle empty array', () => {
+      // WHY: Empty state often needs special UI (e.g., "No items yet")
+      // render(<ComponentName items={[]} />)
+      // expect(screen.getByText(/empty/i)).toBeInTheDocument()
+    })
+
+    it('should handle empty string', () => {
+      // WHY: Empty strings are truthy in JS but visually empty
+      // render(<ComponentName text="" />)
+      // expect(screen.getByText(/placeholder/i)).toBeInTheDocument()
+    })
+  })
+
+  // --------------------------------------------------------------------------
+  // Accessibility (optional but recommended for Dify's enterprise users)
+  // --------------------------------------------------------------------------
+  // WHY: Dify has enterprise customers who may require accessibility compliance
+  describe('Accessibility', () => {
+    it('should have accessible name', () => {
+      // WHY getByRole with name?
+      // - Tests that screen readers can identify the element
+      // - Enforces proper labeling practices
+      // render(<ComponentName label="Test Label" />)
+      // expect(screen.getByRole('button', { name: /test label/i })).toBeInTheDocument()
+    })
+
+    it('should support keyboard navigation', async () => {
+      // WHY: Some users can't use a mouse
+      // const user = userEvent.setup()
+      // render(<ComponentName />)
+      //
+      // await user.tab()
+      // expect(screen.getByRole('button')).toHaveFocus()
+    })
+  })
+})

.claude/skills/frontend-testing/templates/hook-test.template.ts

@@ -0,0 +1,207 @@
+/**
+ * Test Template for Custom Hooks
+ *
+ * Instructions:
+ * 1. Replace `useHookName` with your hook name
+ * 2. Update import path
+ * 3. Add/remove test sections based on hook features
+ */
+
+import { renderHook, act, waitFor } from '@testing-library/react'
+// import { useHookName } from './use-hook-name'
+
+// ============================================================================
+// Mocks
+// ============================================================================
+
+// API services (if hook fetches data)
+// jest.mock('@/service/api')
+// import * as api from '@/service/api'
+// const mockedApi = api as jest.Mocked<typeof api>
+
+// ============================================================================
+// Test Helpers
+// ============================================================================
+
+// Wrapper for hooks that need context
+// const createWrapper = (contextValue = {}) => {
+//   return ({ children }: { children: React.ReactNode }) => (
+//     <SomeContext.Provider value={contextValue}>
+//       {children}
+//     </SomeContext.Provider>
+//   )
+// }
+
+// ============================================================================
+// Tests
+// ============================================================================
+
+describe('useHookName', () => {
+  beforeEach(() => {
+    jest.clearAllMocks()
+  })
+
+  // --------------------------------------------------------------------------
+  // Initial State
+  // --------------------------------------------------------------------------
+  describe('Initial State', () => {
+    it('should return initial state', () => {
+      // const { result } = renderHook(() => useHookName())
+      //
+      // expect(result.current.value).toBe(initialValue)
+      // expect(result.current.isLoading).toBe(false)
+    })
+
+    it('should accept initial value from props', () => {
+      // const { result } = renderHook(() => useHookName({ initialValue: 'custom' }))
+      //
+      // expect(result.current.value).toBe('custom')
+    })
+  })
+
+  // --------------------------------------------------------------------------
+  // State Updates
+  // --------------------------------------------------------------------------
+  describe('State Updates', () => {
+    it('should update value when setValue is called', () => {
+      // const { result } = renderHook(() => useHookName())
+      //
+      // act(() => {
+      //   result.current.setValue('new value')
+      // })
+      //
+      // expect(result.current.value).toBe('new value')
+    })
+
+    it('should reset to initial value', () => {
+      // const { result } = renderHook(() => useHookName({ initialValue: 'initial' }))
+      //
+      // act(() => {
+      //   result.current.setValue('changed')
+      // })
+      // expect(result.current.value).toBe('changed')
+      //
+      // act(() => {
+      //   result.current.reset()
+      // })
+      // expect(result.current.value).toBe('initial')
+    })
+  })
+
+  // --------------------------------------------------------------------------
+  // Async Operations
+  // --------------------------------------------------------------------------
+  describe('Async Operations', () => {
+    it('should fetch data on mount', async () => {
+      // mockedApi.fetchData.mockResolvedValue({ data: 'test' })
+      //
+      // const { result } = renderHook(() => useHookName())
+      //
+      // // Initially loading
+      // expect(result.current.isLoading).toBe(true)
+      //
+      // // Wait for data
+      // await waitFor(() => {
+      //   expect(result.current.isLoading).toBe(false)
+      // })
+      //
+      // expect(result.current.data).toEqual({ data: 'test' })
+    })
+
+    it('should handle fetch error', async () => {
+      // mockedApi.fetchData.mockRejectedValue(new Error('Network error'))
+      //
+      // const { result } = renderHook(() => useHookName())
+      //
+      // await waitFor(() => {
+      //   expect(result.current.error).toBeTruthy()
+      // })
+      //
+      // expect(result.current.error?.message).toBe('Network error')
+    })
+
+    it('should refetch when dependency changes', async () => {
+      // mockedApi.fetchData.mockResolvedValue({ data: 'test' })
+      //
+      // const { result, rerender } = renderHook(
+      //   ({ id }) => useHookName(id),
+      //   { initialProps: { id: '1' } }
+      // )
+      //
+      // await waitFor(() => {
+      //   expect(mockedApi.fetchData).toHaveBeenCalledWith('1')
+      // })
+      //
+      // rerender({ id: '2' })
+      //
+      // await waitFor(() => {
+      //   expect(mockedApi.fetchData).toHaveBeenCalledWith('2')
+      // })
+    })
+  })
+
+  // --------------------------------------------------------------------------
+  // Side Effects
+  // --------------------------------------------------------------------------
+  describe('Side Effects', () => {
+    it('should call callback when value changes', () => {
+      // const callback = jest.fn()
+      // const { result } = renderHook(() => useHookName({ onChange: callback }))
+      //
+      // act(() => {
+      //   result.current.setValue('new value')
+      // })
+      //
+      // expect(callback).toHaveBeenCalledWith('new value')
+    })
+
+    it('should cleanup on unmount', () => {
+      // const cleanup = jest.fn()
+      // jest.spyOn(window, 'addEventListener')
+      // jest.spyOn(window, 'removeEventListener')
+      //
+      // const { unmount } = renderHook(() => useHookName())
+      //
+      // expect(window.addEventListener).toHaveBeenCalled()
+      //
+      // unmount()
+      //
+      // expect(window.removeEventListener).toHaveBeenCalled()
+    })
+  })
+
+  // --------------------------------------------------------------------------
+  // Edge Cases
+  // --------------------------------------------------------------------------
+  describe('Edge Cases', () => {
+    it('should handle null input', () => {
+      // const { result } = renderHook(() => useHookName(null))
+      //
+      // expect(result.current.value).toBeNull()
+    })
+
+    it('should handle rapid updates', () => {
+      // const { result } = renderHook(() => useHookName())
+      //
+      // act(() => {
+      //   result.current.setValue('1')
+      //   result.current.setValue('2')
+      //   result.current.setValue('3')
+      // })
+      //
+      // expect(result.current.value).toBe('3')
+    })
+  })
+
+  // --------------------------------------------------------------------------
+  // With Context (if hook uses context)
+  // --------------------------------------------------------------------------
+  describe('With Context', () => {
+    it('should use context value', () => {
+      // const wrapper = createWrapper({ someValue: 'context-value' })
+      // const { result } = renderHook(() => useHookName(), { wrapper })
+      //
+      // expect(result.current.contextValue).toBe('context-value')
+    })
+  })
+})

.claude/skills/frontend-testing/templates/utility-test.template.ts

@@ -0,0 +1,154 @@
+/**
+ * Test Template for Utility Functions
+ *
+ * Instructions:
+ * 1. Replace `utilityFunction` with your function name
+ * 2. Update import path
+ * 3. Use test.each for data-driven tests
+ */
+
+// import { utilityFunction } from './utility'
+
+// ============================================================================
+// Tests
+// ============================================================================
+
+describe('utilityFunction', () => {
+  // --------------------------------------------------------------------------
+  // Basic Functionality
+  // --------------------------------------------------------------------------
+  describe('Basic Functionality', () => {
+    it('should return expected result for valid input', () => {
+      // expect(utilityFunction('input')).toBe('expected-output')
+    })
+
+    it('should handle multiple arguments', () => {
+      // expect(utilityFunction('a', 'b', 'c')).toBe('abc')
+    })
+  })
+
+  // --------------------------------------------------------------------------
+  // Data-Driven Tests
+  // --------------------------------------------------------------------------
+  describe('Input/Output Mapping', () => {
+    test.each([
+      // [input, expected]
+      ['input1', 'output1'],
+      ['input2', 'output2'],
+      ['input3', 'output3'],
+    ])('should return %s for input %s', (input, expected) => {
+      // expect(utilityFunction(input)).toBe(expected)
+    })
+  })
+
+  // --------------------------------------------------------------------------
+  // Edge Cases
+  // --------------------------------------------------------------------------
+  describe('Edge Cases', () => {
+    it('should handle empty string', () => {
+      // expect(utilityFunction('')).toBe('')
+    })
+
+    it('should handle null', () => {
+      // expect(utilityFunction(null)).toBe(null)
+      // or
+      // expect(() => utilityFunction(null)).toThrow()
+    })
+
+    it('should handle undefined', () => {
+      // expect(utilityFunction(undefined)).toBe(undefined)
+      // or
+      // expect(() => utilityFunction(undefined)).toThrow()
+    })
+
+    it('should handle empty array', () => {
+      // expect(utilityFunction([])).toEqual([])
+    })
+
+    it('should handle empty object', () => {
+      // expect(utilityFunction({})).toEqual({})
+    })
+  })
+
+  // --------------------------------------------------------------------------
+  // Boundary Conditions
+  // --------------------------------------------------------------------------
+  describe('Boundary Conditions', () => {
+    it('should handle minimum value', () => {
+      // expect(utilityFunction(0)).toBe(0)
+    })
+
+    it('should handle maximum value', () => {
+      // expect(utilityFunction(Number.MAX_SAFE_INTEGER)).toBe(...)
+    })
+
+    it('should handle negative numbers', () => {
+      // expect(utilityFunction(-1)).toBe(...)
+    })
+  })
+
+  // --------------------------------------------------------------------------
+  // Type Coercion (if applicable)
+  // --------------------------------------------------------------------------
+  describe('Type Handling', () => {
+    it('should handle numeric string', () => {
+      // expect(utilityFunction('123')).toBe(123)
+    })
+
+    it('should handle boolean', () => {
+      // expect(utilityFunction(true)).toBe(...)
+    })
+  })
+
+  // --------------------------------------------------------------------------
+  // Error Cases
+  // --------------------------------------------------------------------------
+  describe('Error Handling', () => {
+    it('should throw for invalid input', () => {
+      // expect(() => utilityFunction('invalid')).toThrow('Error message')
+    })
+
+    it('should throw with specific error type', () => {
+      // expect(() => utilityFunction('invalid')).toThrow(ValidationError)
+    })
+  })
+
+  // --------------------------------------------------------------------------
+  // Complex Objects (if applicable)
+  // --------------------------------------------------------------------------
+  describe('Object Handling', () => {
+    it('should preserve object structure', () => {
+      // const input = { a: 1, b: 2 }
+      // expect(utilityFunction(input)).toEqual({ a: 1, b: 2 })
+    })
+
+    it('should handle nested objects', () => {
+      // const input = { nested: { deep: 'value' } }
+      // expect(utilityFunction(input)).toEqual({ nested: { deep: 'transformed' } })
+    })
+
+    it('should not mutate input', () => {
+      // const input = { a: 1 }
+      // const inputCopy = { ...input }
+      // utilityFunction(input)
+      // expect(input).toEqual(inputCopy)
+    })
+  })
+
+  // --------------------------------------------------------------------------
+  // Array Handling (if applicable)
+  // --------------------------------------------------------------------------
+  describe('Array Handling', () => {
+    it('should process all elements', () => {
+      // expect(utilityFunction([1, 2, 3])).toEqual([2, 4, 6])
+    })
+
+    it('should handle single element array', () => {
+      // expect(utilityFunction([1])).toEqual([2])
+    })
+
+    it('should preserve order', () => {
+      // expect(utilityFunction(['c', 'a', 'b'])).toEqual(['c', 'a', 'b'])
+    })
+  })
+})