Flutter Tester

What it does

When your agent uses it

• Reviewing tests in a Flutter project
• Tasks that involve Cross-platform mobile apps
• Tasks that involve Unit testing

Example prompts

• “/flutter-tester”

Requirements

• Compatibility (from SKILL.md): Requires a Flutter project with flutter_test. Works with Riverpod, Mockito, and GetIt. Run `dart run build_runner build` to generate mocks after adding @GenerateMocks annotations. Compatible with FVM.

Workflow steps

3 steps, taken from the step headings in SKILL.md.

1. 1Layer Isolation
2. 2Given-When-Then Structure
3. 3Test Organisation

What it can do on your machine

Read from SKILL.md and the folder at commit c94d847. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • flutter
  • dart

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

• Compatibility

  Requires a Flutter project with flutter_test. Works with Riverpod, Mockito, and GetIt. Run `dart run build_runner build` to generate mocks after adding @GenerateMocks annotations. Compatible with FVM.

  From compatibility in the SKILL.md frontmatter.

Context cost

Flutter Tester loads about 1.4k tokens when it runs, and up to ~14k if it reads all its reference files. Until then it costs about 79 tokens; SKILL.md has 405 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~79

When it runs · the whole SKILL.md, loaded when a task matches

~1.4k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~14k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from FNOSP/FlyNarwhal at commit c94d847, republished under its AGPL-3.0 licence (© FNOSP). 405 words, ~1,444 tokens.

name

flutter-tester

description

Use when creating, writing, fixing, or reviewing tests in a Flutter project. Covers unit tests, widget tests, integration tests, Riverpod provider testing, and Mockito mocking. Provides Given-When-Then patterns, layer isolation strategies, and test setup for GetIt, SharedPreferences, and FakeDatabase.

compatibility

Requires a Flutter project with flutter_test. Works with Riverpod, Mockito, and GetIt. Run `dart run build_runner build` to generate mocks after adding @GenerateMocks annotations. Compatible with FVM.

metadata.author

harish

metadata.version

1.0.0

test('Given valid data, When fetchUsers called, Then returns user list', () async {
  // Arrange (Given)
  when(mockDAO.fetchAll()).thenAnswer((_) async => expectedUsers);

  // Act (When)
  final result = await repository.fetchUsers();

  // Assert (Then)
  expect(result, equals(expectedUsers));
  verify(mockDAO.fetchAll()).called(1);
});

group('UserRepository', () {
  group('fetchUsers', () {
    setUp(() { /* init mocks, register with GetIt */ });
    tearDown(() => GetIt.I.reset()); // Always reset GetIt

    test('Given success ... When ... Then ...', () { });
    test('Given error  ... When ... Then ...', () { });
  });
});

@GenerateMocks([IUserDAO, IUserAPI, ILogger])
void main() { ... }

setUp(() {
  mockDAO = MockIUserDAO();
  mockLogger = MockILogger();
  GetIt.I
    ..registerSingleton<IUserDAO>(mockDAO)
    ..registerSingleton<ILogger>(mockLogger);
});

tearDown(() => GetIt.I.reset()); // Critical — always reset

flutter test --coverage                       # All tests with coverage
flutter test test/path/to/test.dart           # Specific file
flutter test --plain-name "Given valid data"  # Filter by name
genhtml coverage/lcov.info -o coverage/html   # Generate HTML coverage report
# Prefix any command with `fvm` if using Flutter Version Manager

© FNOSP, AGPL-3.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 3 other files (references) in .agents/skills/flutter-tester of FNOSP/FlyNarwhal.

• SKILL.md
• references/layer_testing_patterns.md
• references/riverpod_testing_guide.md
• references/widget_testing_guide.md

Open the folder on GitHubat commit c94d847