SimpleCov

Combines coverage data from multiple test suites like unit tests and Cucumber into a single report, providing a holistic view of code coverage across the entire project.

Offers profiles, filters, and groups to customize coverage analysis, such as excluding files or organizing code into logical sections for better reporting.

Supports branch coverage for conditionals in Ruby 2.5+ and oneshot line coverage for faster runs in Ruby 2.6+, giving detailed metrics beyond basic line coverage.

Works with any Ruby test framework, including RSpec, Cucumber, and Test::Unit, without requiring framework-specific adaptations or plugins.