definition_for

# File railties/lib/rails/test_unit/test_parser.rb, line 19
        def self.definition_for(method)
          filepath, start_line = method.source_location
          @begins_to_ends[filepath] ||= ranges(filepath)
          return unless end_line = @begins_to_ends[filepath][start_line]
          [filepath, start_line..end_line]
        end