/flutter-test

Flutter Test

This command runs the Flutter test suite and reports results. When failures occur, it diagnoses and fixes issues incrementally.

What This Command Does

1. Run Tests: Execute flutter test (or scope to changed files)
2. Parse Failures: Identify failing tests by type and cause
3. Fix Incrementally: One failure at a time where possible
4. Verify: Re-run after each fix
5. Report: Show coverage summary and remaining failures

When to Use

Use /flutter-test when:

• After implementing a feature to verify nothing broke
• After running /flutter-build to ensure tests pass
• To check test coverage on new code
• When a specific test file is failing
• Before submitting a PR

Commands Run

# Run all tests
flutter test 2>&1

# Run with coverage
flutter test --coverage 2>&1

# Run specific test file
flutter test test/unit/domain/usecases/get_user_test.dart 2>&1

# Run tests matching a name pattern
flutter test --name "CartBloc" 2>&1

# Run integration tests (requires device/emulator)
flutter test integration_test/ 2>&1

# Update golden files when intentional visual changes are made
flutter test --update-goldens 2>&1

Example Session

User: /flutter-test

Agent:
# Flutter Test Run

## Test Execution

```
$ flutter test
00:05 +42 -2: Some tests failed.

FAILED: test/unit/data/user_repository_test.dart
  UserRepository getById
    returns null when user not found
    Expected: null
    Actual: User(id: 'test-id', name: 'Test User')

FAILED: test/widget/cart_page_test.dart
  CartPage
    shows empty state when cart is empty
    Expected: exactly one widget with text 'Your cart is empty'
    Found: no widget with text 'Your cart is empty'
```

## Fix 1: Repository Test

File: test/unit/data/user_repository_test.dart
Failure: `getById` returns a user when it should return null for missing ID

Root cause: Test setup adds a user with ID 'test-id' but queries with 'missing-id'.
Fix: Updated test to query with 'missing-id' — setup was correct, query was wrong.

```
$ flutter test test/unit/data/user_repository_test.dart
1 test passed.
```

## Fix 2: Widget Test

File: test/widget/cart_page_test.dart
Failure: Empty state text widget not found

Root cause: Empty state message was renamed from 'Your cart is empty' to 'Cart is empty' in the widget.
Fix: Updated test string to match current widget copy.

```
$ flutter test test/widget/cart_page_test.dart
1 test passed.
```

## Final Run

```
$ flutter test --coverage
All 44 tests passed.
Coverage: 84.2% (target: 80%)
```

## Summary

| Metric | Value |
|--------|-------|
| Total tests | 44 |
| Passed | 44 |
| Failed | 0 |
| Coverage | 84.2% |

Test Status: PASS ✓

Common Test Failures

Failure	Typical Fix
Expected: <X> Actual: <Y>	Update assertion or fix implementation
Widget not found	Fix finder selector or update test after widget rename
Golden file not found	Run flutter test --update-goldens to generate
Golden mismatch	Inspect diff; run --update-goldens if change was intentional
MissingPluginException	Mock platform channel in test setup
LateInitializationError	Initialize late fields in setUp()
pumpAndSettle timed out	Replace with explicit pump(Duration) calls

Related Commands

• /flutter-build — Fix build errors before running tests
• /flutter-review — Review code after tests pass
• /tdd — Test-driven development workflow

Related

• Agent: agents/flutter-reviewer.md
• Agent: agents/dart-build-resolver.md
• Skill: skills/flutter-dart-code-review/
• Rules: rules/dart/testing.md