Task 4.7: Write Unit Tests for All Components

[rowantervelde]

Epic: #11 (Epic 4: Edge Cases, Performance & Testing)
Type: Task
Priority: P0 (Critical)
Estimate: 2 days

Description

Write comprehensive unit tests for all new components and composables to achieve ≥80% code coverage.

Acceptance Criteria

• Unit tests for MoodIndicator component (TC-01 to TC-05)
• Unit tests for ArticleList component (TC-06 to TC-11)
• Unit tests for ArticleCard component (TC-12 to TC-16)
• Unit tests for useSentiment composable (API calls, caching)
• Unit tests for useTrendAnalysis composable (if extended)
• Code coverage ≥ 80%
• All tests pass in CI

Technical Notes

• Use Vitest (Nuxt's default test runner)
• Mount components with @vue/test-utils
• Mock API responses with vi.mock()
• Test accessibility: ARIA attributes, keyboard nav
• Test error states: loading, error, empty data
• Consider snapshot tests for visual regression

Dependencies

• Blocks: None (end of Epic 4)
• Blocked by: All Epic 1-3 implementation tasks

Test Coverage

• Test cases: TC-01 to TC-16
• Coverage report in CI

Related Files

• tests/ directory (create if not exists)
• All component/composable files
• package.json (add test scripts)

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Part of Feature 004: Sentiment Detail Breakdown Page