test: implement Phase 3 - Component Testing#139
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Completed Phase 3 of the testing roadmap by implementing comprehensive React component tests for all popup and sidepanel components. ## Changes ### Test Files Added (78 new tests across 9 files) - Popup button components (26 tests): - CopyCurrentTabButton.test.tsx (8 tests) - CopySelectedTabsButton.test.tsx (10 tests) - CopyAllTabsButton.test.tsx (8 tests) - Sidepanel components (16 tests): - HistoryItem.test.tsx (12 tests) - EmptyState.test.tsx (4 tests) - App components (18 tests): - popup/App.test.tsx (5 tests) - sidepanel/App.test.tsx (13 tests) ### Configuration Updates - Created vitest.config.components.ts for React component tests - Separate config to avoid WXT/esbuild/jsdom conflicts - Uses @vitejs/plugin-react for proper React support - Updated vitest.config.ts to only run utility tests - Created vitest.setup.components.ts for component test setup - Mocks browser API (i18n, tabs, storage, scripting) - Mocks navigator.clipboard - Updated package.json scripts: - test: runs both utils and components - test:utils: runs utility tests - test:components: runs component tests ### Documentation - Updated docs/testing.md to mark Phases 1 and 2 as complete ## Test Coverage - Total: 127 tests (49 utils + 78 components) - all passing ✅ - Component coverage: Comprehensive tests for all React components - Tests user interactions, props, state management, callbacks, error handling ## Technical Notes - Solved jsdom environment compatibility issue by using separate vitest configs - Component tests use React Testing Library with userEvent for interaction testing - All components tested for rendering, user interactions, i18n, and error handling - Mock strategy: Mock utilities and browser APIs, test components in isolation Fixes: Component testing infrastructure (Phase 3 of testing roadmap)
Fixed type errors that would cause CI to fail: 1. Fixed link utility mock return types - Changed mockReturnValue to mockResolvedValue for async functions - createLinkForTab and createLinksForTabs return Promise<string> 2. Fixed i18n getMessage mock signatures - Updated to support overloaded function signatures - Uses ...args: any[] to handle both (key, fallback) and (key, substitutions, fallback) 3. Fixed browser.i18n.getMessage mocking - Changed from vi.spyOn to direct assignment to avoid type conflicts - browser.i18n.getMessage = vi.fn(...) instead of vi.spyOn(browser.i18n, 'getMessage') 4. Fixed global.browser type declaration - Changed from 'var browser' to (global as any).browser - Avoids redeclaration error in TypeScript All tests pass: - Utils: 49 tests, 100% coverage - Components: 78 tests, all passing - TypeScript compilation: ✅ no errors
Applied code review feedback to improve test maintainability and clarity: **Type Safety & Mocking** - Simplified mock Tab objects with explanatory comments about using 'as any' - Fixed async/await warnings by adding proper waitFor usage in App tests **Coverage & Testing** - Added coverage configuration for component tests - Excluded hooks from coverage (tested indirectly through components) - Split test commands for separate utils/components execution **Documentation** - Added Development section to README.md with test commands - Simplified vitest.config.ts exclude patterns **Results** - All 127 tests passing (49 utils + 78 components) - TypeScript compilation successful - Utils coverage: 100% - Components coverage: 93.75% (excluding hooks)
Added explicit requirement to run CI checks locally before committing: - npm run compile (TypeScript type checking) - npm run test:coverage (tests with coverage) Updated three sections: 1. Standard Development Cycle - Added CI verification as step 4 2. Pre-Commit Checklist - Made CI verification the first required item 3. Before Creating PR - Added CI verification to PR preparation steps This ensures developers catch type errors and test failures before pushing, preventing CI failures and saving review time.
Fixed unhandled rejection errors that were causing CI failures: **Bug Fixed** - CopySelectedTabsButton.tsx: Added .catch() to useEffect's getSelectedTabs() call to handle errors properly (previously missing error handling) **Test Improvements** - Added console.error mocking to "should not call onCopied if operation fails" tests in all three button components to properly handle error scenarios - Ensures all rejected promises are caught and verified in tests **CI Impact** - Resolves exit code 1 failures in test:coverage - All 78 tests now pass without unhandled rejection errors - Coverage: 93.87% (components), 100% (utils) This was a real bug - the useEffect hook could fail silently in production if getSelectedTabs() rejected, leaving the tab count at 0.
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Completed Phase 3 of the testing roadmap by implementing comprehensive
React component tests for all popup and sidepanel components.
Changes
Test Files Added (78 new tests across 9 files)
Configuration Updates
Documentation
Test Coverage
Technical Notes
Fixes: Component testing infrastructure (Phase 3 of testing roadmap)