class Crispr::Runner

runs the test suite, and restores the original file afterward.
It temporarily replaces the file’s source with a mutated version,
Runner is responsible for executing tests against mutated code.

def self.run_mutation(path:, mutated_source:, test_path: nil)

Returns:
  • (Boolean) - true if the mutation was killed (test suite failed), false otherwise

Parameters:
  • test_path (String, nil) -- optional path to a specific test file to run
  • mutated_source (String) -- the mutated version of the file's source code
  • path (String) -- the path to the source file to mutate 
def self.run_mutation(path:, mutated_source:, test_path: nil)
  original_source = File.read(path)
  begin
    File.write(path, mutated_source)
    test_cmd = test_path ? "bundle exec rspec #{test_path}" : "bundle exec rspec"
    stdout, stderr, status = Open3.capture3(test_cmd)
    killed = !status.success?
    puts stdout unless status.success?
    puts stderr unless status.success?
    killed
  ensure
    File.write(path, original_source)
  end
end