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ADR-0051: 80% Test Coverage Requirement

Status​

Accepted - 2025-01-26

Context​

Code coverage ensures critical paths are tested and prevents regressions.

Decision​

80% minimum coverage with Vitest.

Rationale​

  1. Practical: Balances thoroughness and development speed
  2. Critical Paths: 100% for auth, payments, RLS
  3. Industry Standard: Most teams use 70-80%

Configuration​

// vitest.config.ts
export default defineConfig({
  test: {
    coverage: {
      provider: 'v8',
      reporter: ['text', 'json', 'html'],
      lines: 80,
      functions: 80,
      branches: 80,
      statements: 80,
    },
  },
});

Critical Paths (100% Required)​

  • Authentication & authorization
  • Payment processing
  • RLS policies
  • Booking logic (prevent double-booking)

CI/CD Integration​

# Fail build if coverage <80%
pnpm test:coverage

References​