Add comprehensive unit tests for all components

[devin-ai-integration]

Add comprehensive unit tests for all components

Summary

This PR introduces a complete testing infrastructure for the component library and adds comprehensive unit tests for both existing components (SearchBar and Login). The testing setup uses Jest + React Testing Library following React community best practices.

Key Changes:

• ✅ Set up Jest testing framework with jsdom environment
• ✅ Added React Testing Library for component testing utilities
• ✅ Created comprehensive test suites for SearchBar (9 tests) and Login (31 tests)
• ✅ Added Babel configuration for JSX transformation in tests
• ✅ Configured CSS module mocking to handle stylesheet imports
• ✅ Added test scripts to package.json (test, test:watch, test:coverage)

Test Coverage:

• SearchBar: Props handling, theme colors, icon rendering, CSS custom properties
• Login: Form interactions, state management, conditional rendering, event handlers, loading states, social login, error handling, accessibility

All 40 tests are currently passing ✅

Review & Testing Checklist for Human

• Run tests locally - Execute npm test to verify tests work in your environment and all 40 tests pass
• Review test quality - Examine test assertions in both test files to ensure they test user-visible behavior rather than implementation details
• Verify build compatibility - Run npm run build to confirm testing dependencies don't break the build process
• Test CSS functionality - Manually verify that component styling still works correctly despite CSS mocking in tests
• Check test coverage completeness - Review if tests cover all major component features and edge cases

Recommended Test Plan:

1. Clone branch and run npm install then npm test
2. Test a few component features manually to ensure CSS mocking doesn't hide real issues
3. Run npm run build to verify production build still works
4. Review test files for any obvious gaps in coverage

---

Diagram

%%{ init : { "theme" : "default" }}%%
graph TB
    subgraph "Component Library Structure"
        SearchBarComp["src/components/SearchBar/<br/>SearchBar.js"]:::context
        LoginComp["src/components/Login/<br/>Login.js"]:::context
        
        SearchBarTest["src/components/SearchBar/<br/>__tests__/SearchBar.test.js"]:::major-edit
        LoginTest["src/components/Login/<br/>__tests__/Login.test.js"]:::major-edit
        
        JestConfig["jest.config.js"]:::major-edit
        BabelConfig[".babelrc"]:::major-edit
        SetupTests["src/setupTests.js"]:::major-edit
        PackageJson["package.json"]:::minor-edit
    end
    
    SearchBarComp -->|"tests"| SearchBarTest
    LoginComp -->|"tests"| LoginTest
    
    JestConfig -->|"configures"| SearchBarTest
    JestConfig -->|"configures"| LoginTest
    BabelConfig -->|"JSX transform"| SearchBarTest
    BabelConfig -->|"JSX transform"| LoginTest
    SetupTests -->|"test utilities"| SearchBarTest
    SetupTests -->|"test utilities"| LoginTest
    
    PackageJson -->|"test scripts +<br/>dependencies"| JestConfig

    subgraph Legend
        L1["Major Edit"]:::major-edit
        L2["Minor Edit"]:::minor-edit    
        L3["Context/No Edit"]:::context
    end

    classDef major-edit fill:#90EE90
    classDef minor-edit fill:#87CEEB
    classDef context fill:#FFFFFF

Loading

Notes

• This is the first testing infrastructure for the component library - previously had zero tests
• Fixed 2 test failures during development by adjusting assertions to match actual component behavior
• CSS imports are mocked using identity-obj-proxy which may not catch styling-related bugs
• Added significant number of dev dependencies (~540 packages) which increases maintenance surface
• Tests follow React Testing Library best practices (testing user behavior, semantic queries, accessibility)

Link to Devin run: https://app.devin.ai/sessions/9ee15b8940af4a648943cb6aefea12c4
Requested by: @ben-windsurf (ben.lehrburger@windsurf.com)

[devin-ai-integration]

🤖 Devin AI Engineer

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

• Address comments on this PR. Add '(aside)' to your comment to have me ignore it.
• Look at CI failures and help fix them

Note: I can only respond to comments from users who have write access to this repository.

⚙️ Control Options:

• Disable automatic comment and CI monitoring