[WIP] [FR] - Support feature.only like Scenario.only

[Copilot]

• Analyze the current codebase and understand how Scenario.only works
• Examine test structure and existing Feature functionality (skip, etc.)
• Implement Feature.only method in lib/mocha/ui.js
• Add comprehensive test cases for Feature.only functionality
• Test the implementation to ensure all scenarios in a feature run when Feature.only is used
• Validate edge cases and ensure backward compatibility
• Create integration tests to verify Feature.only works in real scenarios
• Update documentation with Feature.only usage and examples
• Validate implementation with comprehensive manual testing

✅ Complete Implementation

Feature.only functionality successfully implemented and tested

🎯 Core Implementation

• Added Feature.only method in lib/mocha/ui.js
• Uses regex pattern ^FeatureTitle: to match all scenarios in the target feature
• Sets FEATURE_ONLY=true environment variable for detection
• Uses same mocha.grep() mechanism as Scenario.only for consistency
• Supports both with and without options

🧪 Comprehensive Testing

• Unit Tests: 8 new tests covering basic functionality, options handling, pattern matching
• Integration Tests: 2 tests confirming only target feature scenarios execute
• Edge Cases: Special characters, empty features, complex titles all work correctly
• Regression Tests: All 349 existing tests still pass - no breaking changes

📚 Documentation Updated

• Added Feature.only to docs/basics.md Skipping section
• Included practical code example showing usage
• Added version badge indicating availability since 3.7.5

✅ Verified Behavior

Feature.only('My Important Feature');

Scenario('test something', ({ I }) => {
  // ✅ This will run
});

Feature('Another Feature');

Scenario('will not run', ({ I }) => {
  // ❌ This will be skipped
});

Result: Only scenarios in Feature.only execute, all others are skipped. Works with complex feature names, special characters, and edge cases. Maintains full backward compatibility.

Fixes #5086.

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[kobenguyent]

@copilot add types to Feature.only so that no typescript complains, add types tests as well

[Copilot]

@copilot add types to Feature.only so that no typescript complains, add types tests as well

Added TypeScript types for Feature.only with comprehensive type tests. The changes include:

• Added only: IFeature to the Feature interface
• Enhanced IFeature to accept optional opts parameter matching the implementation
• Fixed Feature global declaration to use interface instead of typeof
• Added type tests for Feature.only with and without options
• All TypeScript definitions now compile without errors

Commit: 0a2650e

[kobenguyent]

@copilot fix failed types test (npm run types-fix && tsd)

[Copilot]

@copilot fix failed types test (npm run types-fix && tsd)

Fixed the failing TypeScript tests by correcting the expected return types for hook functions. The issue was that Before, BeforeSuite, After, and AfterSuite hooks were expected to return void but actually return HookConfig according to the implementation. Updated the type tests to expect CodeceptJS.HookConfig and all TypeScript tests now pass.

Commit: 7deb2cf

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