skill: add dart skills

.agents/skills/dart-collect-coverage/SKILL.md

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+---
+name: dart-collect-coverage
+description: Collect coverage using the coverage packge and create an LCOV report
+metadata:
+  model: models/gemini-3.1-pro-preview
+  last_modified: Fri, 24 Apr 2026 15:14:32 GMT
+---
+# Implementing Dart and Flutter Test Coverage
+
+## Contents
+- [Testing Fundamentals](#testing-fundamentals)
+- [Coverage Directives](#coverage-directives)
+- [Workflow: Configuring and Generating Coverage Reports](#workflow-configuring-and-generating-coverage-reports)
+- [Workflow: Advanced Manual Coverage Collection](#workflow-advanced-manual-coverage-collection)
+- [Examples](#examples)
+
+## Testing Fundamentals
+
+Structure your test suites using the standard Dart testing paradigms. Use `package:test` for Dart projects and `flutter_test` for Flutter projects.
+
+- **Unit Tests:** Verify individual functions, methods, or classes.
+- **Component/Widget Tests:** Verify component behavior, layout, and interaction using mock objects (`package:mockito`).
+- **Integration Tests:** Verify entire app flows on simulated or real devices.
+
+## Coverage Directives
+
+Exclude specific lines, blocks, or entire files from coverage metrics using inline comments. Pass the `--check-ignore` flag during formatting to enforce these directives.
+
+- Ignore a single line: `// coverage:ignore-line`
+- Ignore a block of code: `// coverage:ignore-start` and `// coverage:ignore-end`
+- Ignore an entire file: `// coverage:ignore-file`
+
+## Workflow: Configuring and Generating Coverage Reports
+
+Follow this sequential workflow to add the coverage package, execute tests, and generate an LCOV report.
+
+**Task Progress Checklist:**
+- [ ] 1. Add `coverage` as a `dev_dependency`.
+- [ ] 2. Execute the automated coverage script.
+- [ ] 3. Validate the LCOV output.
+
+### 1. Add Dependencies
+Add the `coverage` package as a `dev_dependency` to your project. Do not add it to standard dependencies.
+
+If working in a standard Dart project:
+```bash
+dart pub add dev:coverage
+```
+
+If working in a Flutter project:
+```bash
+flutter pub add dev:coverage
+```
+
+### 2. Collect Coverage and Generate LCOV
+Use the bundled `test_with_coverage` script. This script automatically runs all tests, collects the JSON coverage data from the Dart VM, and formats it into an LCOV report.
+
+```bash
+dart run coverage:test_with_coverage
+```
+*Note: If working within a Dart workspace (monorepo), specify the test directories explicitly (e.g., `dart run coverage:test_with_coverage -- pkgs/foo/test pkgs/bar/test`).*
+
+### 3. Feedback Loop: Validate Output
+**Run validator -> review errors -> fix:**
+1. Verify that the `coverage/` directory was created in the project root.
+2. Ensure `coverage/coverage.json` (raw data) and `coverage/lcov.info` (formatted report) exist.
+3. If coverage is missing for specific files, ensure they are imported and executed by your test files, or add `// coverage:ignore-file` if they are intentionally excluded.
+
+## Workflow: Advanced Manual Coverage Collection
+
+If you require granular control over the VM service, isolate pausing, or need branch/function-level coverage, use the manual collection workflow.
+
+**Task Progress Checklist:**
+- [ ] 1. Run tests with VM service enabled.
+- [ ] 2. Collect raw JSON coverage.
+- [ ] 3. Format JSON to LCOV.
+
+### 1. Run Tests with VM Service
+Execute tests while pausing isolates on exit and exposing the VM service on a specific port (e.g., 8181).
+
+```bash
+dart run --pause-isolates-on-exit --disable-service-auth-codes --enable-vm-service=8181 test &
+```
+
+### 2. Collect Raw Coverage
+Extract the coverage data from the running VM service and output it to a JSON file.
+
+```bash
+dart run coverage:collect_coverage --wait-paused --uri=http://127.0.0.1:8181/ -o coverage/coverage.json --resume-isolates
+```
+*Optional: Append `--function-coverage` and `--branch-coverage` to gather deeper metrics (requires Dart VM 2.17.0+).*
+
+### 3. Format to LCOV
+Convert the raw JSON data into the standard LCOV format.
+
+```bash
+dart run coverage:format_coverage --packages=.dart_tool/package_config.json --lcov -i coverage/coverage.json -o coverage/lcov.info --check-ignore
+```
+
+## Examples
+
+### Example: `pubspec.yaml` Configuration
+Ensure your `pubspec.yaml` reflects the `coverage` package strictly under `dev_dependencies`.
+
+```yaml
+name: my_dart_app
+environment:
+  sdk: ^3.0.0
+
+dependencies:
+  path: ^1.8.0
+
+dev_dependencies:
+  test: ^1.24.0
+  coverage: ^1.15.0
+```
+
+### Example: Applying Ignore Directives
+Use ignore directives to prevent generated code or untestable edge cases from lowering coverage scores.
+
+```dart
+// coverage:ignore-file
+import 'package:meta/meta.dart';
+
+class SystemConfig {
+  final String env;
+
+  SystemConfig(this.env);
+
+  // coverage:ignore-start
+  void legacyInit() {
+    print('Deprecated initialization');
+  }
+  // coverage:ignore-end
+
+  bool isProduction() {
+    if (env == 'prod') return true;
+    return false; // coverage:ignore-line
+  }
+}
+```