Testing Strategy: Unit, Integration, and E2E

Date: 2025-10-05

Issue: #2

Context

We need a comprehensive testing strategy that ensures code quality and prevents regressions as the Georgian language learning platform grows.

Decision

We will implement a three-tier testing approach:

Unit Testing

• vitest for fast unit tests
• @testing-library/react for component testing
• Co-located tests next to source files

Integration Testing

• vitest for integration tests
• API testing for serverless functions
• Component interaction testing

End-to-End Testing

• Playwright for E2E testing (planned)
• User journey testing for critical paths
• Cross-browser compatibility testing

Consequences

Positive

✅ Fast feedback - vitest provides quick test execution
✅ Reliable components - Testing Library ensures accessible components
✅ User confidence - E2E tests verify complete workflows
✅ Regression prevention - Comprehensive test coverage

Negative

⚠️ Maintenance overhead - Tests need to be kept up to date
⚠️ E2E complexity - Playwright tests can be flaky

Implementation

Current Test Structure

src/
  components/
    Button.tsx
    Button.test.tsx    # Co-located unit tests
  __tests__/           # Integration tests
e2e/                   # E2E tests (planned)

Testing Tools Implementation

• vitest - Currently used for unit and integration testing
• @testing-library/react - Component testing utilities are integrated
• Playwright - E2E testing is planned for future implementation