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145 lines
3.7 KiB
Markdown
145 lines
3.7 KiB
Markdown
---
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description: Run Flutter/Dart tests, report failures, and incrementally fix test issues. Covers unit, widget, golden, and integration tests.
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---
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# Flutter Test
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This command runs the Flutter test suite and reports results. When failures occur, it diagnoses and fixes issues incrementally.
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## What This Command Does
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1. **Run Tests**: Execute `flutter test` (or scope to changed files)
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2. **Parse Failures**: Identify failing tests by type and cause
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3. **Fix Incrementally**: One failure at a time where possible
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4. **Verify**: Re-run after each fix
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5. **Report**: Show coverage summary and remaining failures
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## When to Use
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Use `/flutter-test` when:
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- After implementing a feature to verify nothing broke
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- After running `/flutter-build` to ensure tests pass
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- To check test coverage on new code
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- When a specific test file is failing
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- Before submitting a PR
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## Commands Run
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```bash
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# Run all tests
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flutter test 2>&1
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# Run with coverage
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flutter test --coverage 2>&1
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# Run specific test file
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flutter test test/unit/domain/usecases/get_user_test.dart 2>&1
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# Run tests matching a name pattern
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flutter test --name "CartBloc" 2>&1
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# Run integration tests (requires device/emulator)
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flutter test integration_test/ 2>&1
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# Update golden files when intentional visual changes are made
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flutter test --update-goldens 2>&1
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```
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## Example Session
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````text
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User: /flutter-test
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Agent:
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# Flutter Test Run
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## Test Execution
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```
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$ flutter test
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00:05 +42 -2: Some tests failed.
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FAILED: test/unit/data/user_repository_test.dart
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UserRepository getById
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returns null when user not found
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Expected: null
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Actual: User(id: 'test-id', name: 'Test User')
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FAILED: test/widget/cart_page_test.dart
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CartPage
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shows empty state when cart is empty
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Expected: exactly one widget with text 'Your cart is empty'
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Found: no widget with text 'Your cart is empty'
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```
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## Fix 1: Repository Test
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File: test/unit/data/user_repository_test.dart
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Failure: `getById` returns a user when it should return null for missing ID
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Root cause: Test setup adds a user with ID 'test-id' but queries with 'missing-id'.
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Fix: Updated test to query with 'missing-id' — setup was correct, query was wrong.
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```
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$ flutter test test/unit/data/user_repository_test.dart
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1 test passed.
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```
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## Fix 2: Widget Test
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File: test/widget/cart_page_test.dart
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Failure: Empty state text widget not found
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Root cause: Empty state message was renamed from 'Your cart is empty' to 'Cart is empty' in the widget.
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Fix: Updated test string to match current widget copy.
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```
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$ flutter test test/widget/cart_page_test.dart
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1 test passed.
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```
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## Final Run
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```
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$ flutter test --coverage
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All 44 tests passed.
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Coverage: 84.2% (target: 80%)
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```
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## Summary
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| Metric | Value |
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|--------|-------|
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| Total tests | 44 |
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| Passed | 44 |
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| Failed | 0 |
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| Coverage | 84.2% |
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Test Status: PASS ✓
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````
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## Common Test Failures
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| Failure | Typical Fix |
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|---------|-------------|
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| `Expected: <X> Actual: <Y>` | Update assertion or fix implementation |
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| `Widget not found` | Fix finder selector or update test after widget rename |
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| `Golden file not found` | Run `flutter test --update-goldens` to generate |
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| `Golden mismatch` | Inspect diff; run `--update-goldens` if change was intentional |
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| `MissingPluginException` | Mock platform channel in test setup |
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| `LateInitializationError` | Initialize `late` fields in `setUp()` |
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| `pumpAndSettle timed out` | Replace with explicit `pump(Duration)` calls |
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## Related Commands
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- `/flutter-build` — Fix build errors before running tests
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- `/flutter-review` — Review code after tests pass
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- `/tdd` — Test-driven development workflow
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## Related
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- Agent: `agents/flutter-reviewer.md`
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- Agent: `agents/dart-build-resolver.md`
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- Skill: `skills/flutter-dart-code-review/`
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- Rules: `rules/dart/testing.md`
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