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Enforce test-first development and measure coverage gaps. Drives write-test → implement → verify. Use for new features and bug fixes.
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| name | test-coverage |
| description | Enforce test-first development and measure coverage gaps. Drives write-test → implement → verify. Use for new features and bug fixes. |
| origin | FlowDeck |
Ensures code is tested before it is considered done. Coverage numbers are a by-product — the goal is meaningful tests that catch real bugs.
Activate when:
# vitest
npx vitest --coverage
npx vitest --coverage --reporter=verbose
# jest
npx jest --coverage
# view HTML report
open coverage/index.html
A passing coverage report looks like this:
----------|---------|----------|---------|---------|
File | % Stmts | % Branch | % Funcs | % Lines |
----------|---------|----------|---------|---------|
All files | 87.3 | 82.1 | 91.4 | 87.3 |
auth.ts | 94.2 | 88.0 | 100.0 | 94.2 |
user.ts | 80.1 | 76.4 | 85.7 | 80.1 |
----------|---------|----------|---------|---------|
Coverage threshold met: 80% ✅
A failing report looks like:
services/payment.ts | 41.2 | 30.0 | 50.0 | 41.2 |
Coverage threshold NOT met: 41.2% < 80% ❌
Uncovered lines: 45-67, 89-112
| Category | Examples |
|---|---|
| Happy path | Normal inputs, expected outputs |
| Error conditions | Invalid inputs, missing fields, null |
| Edge cases | Empty arrays, zero values, max values |
| Auth | Unauthenticated, unauthorized, correct role |