class SimpleCov::Result

project-relative one.
SimpleCov.root, so callers can pass either an absolute path or a
matching file is in this result. The path is resolved against
Returns the SimpleCov::SourceFile for the given path, or nil if no

def source_file_for(path)
  target = File.expand_path(path, SimpleCov.root)
  files.find { |file| file.filename == target }
end