add "rake" as a development dependency so you can run the tests with "bundle exec"
correct the name of "test/helper.rb" in the gemspec
satisfy mocha deprecation notice: require "mocha/setup"
extract File.join(output_path, output_file_name) to existing method
get rid of trailing commas
only call .to_json once
omit groups: these render the entire source of the files and dramatically increases the size of coverage.json
misc