• 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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