class Rails::TestUnit::Filter

def ===(method)
  return unless @runnable.method_defined?(method)
  if @line
    test_file, test_range = definition_for(@runnable.instance_method(method))
    test_file == @file && test_range.include?(@line)
  else
    @runnable.instance_method(method).source_location.first == @file
  end
end

def definition_for(method)
  file, start_line = method.source_location
  end_line = method.source.count("\n") + start_line - 1
  return file, start_line..end_line
end

def initialize(runnable, file, line)
  @runnable, @file = runnable, File.expand_path(file)
  @line = line.to_i if line
end