class Rails::TestUnit::Filter

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

def definition_for(method)
  TestParser.definition_for(method)
end

def initialize(runnable, file, line_or_range)
  @runnable, @file = runnable, File.expand_path(file)
  if line_or_range
    first, last = line_or_range.split("-").map(&:to_i)
    last ||= first
    @line_range = Range.new(first, last)
  end
end