Minimum coverage on ruby gems

spec_helper.rb

if ENV['COVERAGE']
  require "coverage"
  Coverage.start
  at_exit do
    # "great_library" is example gem name
    cov = Coverage.result.select { |d| d.match?(%r{/great_library/lib/}) }
    cov.transform_keys! { |key| key.dup.sub!(%r{^.*great_library/(lib/.*)$}, '\1') }
    cov.transform_values! do |ary|
      ary = ary.compact
      ary.count { |l| l > 0 }.fdiv(ary.length)
    end
    max_length = cov.keys.max_by(&:length).length

    puts "Coverage"
    cov.to_a.sort_by { |k, v| v }.each do |k, v|
      puts "| %-#{max_length}s | %6.2f %% |" % [k, v * 100]
    end
  end
end

# require "great_library"