MushroomObserver / mushroom-observer / 20323078991

95%

main: 96%

Pull #3582

github

Disable SimpleCov for parallel tests and add test:coverage command

SimpleCov doesn't fully support Rails 7's parallel testing due to
process isolation making coverage merging unreliable. This change
improves test performance by disabling coverage during normal parallel
test runs while providing a dedicated command for coverage generation.

Changes:
- Only load SimpleCov when COVERAGE=true or CI=true
- Run tests serially when coverage is enabled
- Add custom 'rails test:coverage' command via bin/rails modification
- Support positional arguments: rails test:coverage path/to/test.rb
- Update documentation in README_CODE.md and parallel_testing.md

Usage:
  rails test                          # Fast parallel, no coverage
  rails test path/to/test.rb          # Fast parallel, no coverage
  rails test:coverage                  # All tests with coverage (serial)
  rails test:coverage path/to/test.rb  # Specific test with coverage

Implementation:
The bin/rails script intercepts 'test:coverage' before Rails processes
it, sets COVERAGE=true, and converts it to 'rails test' with the same
arguments. This allows the command to work exactly like 'rails test'
but with coverage enabled.

Benefits:
- Faster local test runs (no coverage overhead)
- Reliable coverage reporting when needed
- Maintains CI coverage requirements (CI=true still enables SimpleCov)
- Intuitive command syntax matching 'rails test'

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

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