Issue #20: Comprehensive Test Suite

[Vivaanfbcmc]

Description

Implement a comprehensive test suite covering unit tests, integration tests, and end-to-end tests.

Requirements

• Set up Jest and React Testing Library
• Create unit tests for all utility functions
• Implement component testing for all widgets
• Add integration tests for API endpoints
• Create end-to-end tests with Playwright
• Add test coverage reporting

Acceptance Criteria

• Test coverage is above 80%
• All critical paths are tested
• Tests run in CI/CD pipeline
• Coverage reports are generated
• Tests are fast and reliable

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