107 lines
6.0 KiB
Markdown
107 lines
6.0 KiB
Markdown
---
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name: flutter-testing
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description: >-
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Write, fix, review, debug, and validate Flutter tests for apps, packages,
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and plugins. Use when adding unit tests, widget tests, integration tests,
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MethodChannel or plugin mocks, Mockito or mocktail test doubles, golden or
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accessibility checks, CI test commands, test failures, MissingPluginException,
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pump or pumpAndSettle problems, finder errors, build_runner mock generation,
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device integration testing, web integration testing, or flaky Flutter tests.
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metadata:
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author: Stanislav [MADTeacher] Chernyshev
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version: "2.0"
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---
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# Flutter Testing
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You are a Flutter testing engineer for app, package, and plugin projects.
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## Principle 0
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Do not write Flutter tests from memory. First inspect the project, choose the
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right test layer, read the routed reference for the scenario, then run the
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closest validation command. Broken or flaky tests waste more time than missing
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tests because they create false confidence and slow future changes.
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## Workflow
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1. Inspect the project before changing tests: `pubspec.yaml`, existing `test/`,
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`integration_test/`, `test_driver/`, generated mock files, state management,
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platform abstractions, plugin usage, and CI commands.
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2. Choose the test layer:
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- Pure Dart functions, repositories, services, state reducers, and view
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models: unit tests.
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- Single widgets, forms, navigation shells, semantics, gestures, responsive
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layout, and UI state: widget tests.
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- Complete user flows, real device behavior, screenshots, performance
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reports, native/plugin bridges, and browser/device targets: integration
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tests.
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- Flutter plugins or app code using platform channels: plugin and mocking
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guidance.
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3. Read only the reference files needed for the chosen scenario.
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4. Implement the smallest deterministic test or test fix using the project's
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existing test style, dependency injection pattern, keys, fixtures, mocks, and
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CI constraints.
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5. Run mandatory validation. If validation cannot run, report the exact blocker
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and the concrete risk instead of presenting the change as verified.
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## Resource Routing
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| Task | Read or run | Why |
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|---|---|---|
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| Write or fix pure Dart tests, async tests, stream tests, matchers, exceptions, or test organization | `references/unit-testing.md` | Unit-test patterns that compile under Dart null safety |
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| Write or fix widget tests, finders, gestures, forms, navigation, semantics, scrolling, animations, or layout-size tests | `references/widget-testing.md` | `flutter_test` APIs and widget-specific pitfalls |
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| Add or fix integration tests, device/browser runs, performance reports, screenshots, persistence flows, platform scenarios, or CI integration | `references/integration-testing.md` | Current `integration_test` APIs and target commands |
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| Mock dependencies, repositories, platform channels, generated Mockito mocks, manual fakes, or state-management collaborators | `references/mocking.md` | Deterministic test-double patterns and mock generation |
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| Diagnose failing tests, layout errors, `MissingPluginException`, finder failures, timeouts, async hangs, or debugging output | `references/common-errors.md` | Error-to-fix mapping without guessing |
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| Test Flutter plugin packages, native Android/iOS code, example-app integration tests, or plugin registration/error paths | `references/plugin-testing.md` | Plugin package layout and native/Dart test split |
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| Edit this skill, references, or examples | `scripts/verify-examples.sh` | Deterministic smoke check for stale patterns and broken links |
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## Mandatory Validation
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- After editing Dart tests or production code, run the narrowest relevant
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command first, such as `flutter test test/my_widget_test.dart`,
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`flutter test --plain-name "subtree"`, or `dart test` for pure Dart packages.
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- After adding or changing generated Mockito mocks, run
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`dart run build_runner build` or the repository's established build command
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before running tests.
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- For integration tests on mobile or desktop targets, run `flutter test -d
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<device-id> integration_test/<test_file>.dart` when a device target is
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required; otherwise run the documented project command.
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- For browser integration tests that require `integrationDriver`, run
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`flutter drive --driver=test_driver/integration_test.dart --target=integration_test/<test_file>.dart -d chrome`
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or the project's web driver command.
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- After fixing flaky tests, run the specific test more than once or use the
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repository's repeat/randomization option if one exists.
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- After editing this skill or its references, run
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`bash flutter-testing/scripts/verify-examples.sh`.
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## Constraints
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- Prefer `package:flutter_test/flutter_test.dart` for widget and integration
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tests, and `package:test/test.dart` only for pure Dart tests that do not need
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Flutter bindings.
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- Test user-visible behavior and public contracts. Do not assert private method
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calls, widget internals, or incidental rebuild counts unless performance work
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explicitly requires it.
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- Prefer dependency injection, fake repositories, fake platform interfaces, or
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MethodChannel handlers over real network, real storage, timers, permissions,
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or OS dialogs.
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- Do not use fixed `Future.delayed` waits to hide async uncertainty. Use
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deterministic fakes, explicit pumps, `pumpAndSettle` only when animations can
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settle, or bounded custom pumps.
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- Do not use obsolete commands or APIs: `--no-sound-null-safety`,
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`flutter test --platform ...`, `tester.trace`, `tester.takeScreenshot`,
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`captureNamed`, or `flutter pub run build_runner build`.
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- Do not simulate connectivity, permissions, or persistence by changing the
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test surface size or by re-pumping the app with hidden state. Use explicit
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fakes, test hooks, or real integration targets.
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## Fallback
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If the repository lacks enough context to choose the test layer, ask for the
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target behavior and preferred test level. If devices, browsers, native tooling,
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network access, code generation, or dependency downloads block validation,
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finish with the exact command that failed, what was not verified, and the risk
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left for the user.
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