Binary package “ruby-simplecov” in ubuntu bionic
code coverage for Ruby 1.9+
Code coverage for Ruby 1.9 with a powerful configuration library and automatic
merging of coverage across test suites.
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It uses 1.9's built-in Coverage library to gather code coverage data, but makes
processing its results much easier by providing a clean API to filter, group,
merge, format and display those results, thus giving you a complete code
coverage suite that can be set up with just a couple lines of code.