module Minitest::Line

def methods_with_lines(target_file)
  runnables.flat_map do |runnable|
    rname = runnable.name
    runnable.runnable_methods.map do |name|
      file, line = runnable.instance_method(name).source_location
      next unless file == target_file
      test_name = (rname ? "#{rname}##{name}" : name)
      [test_name, line]
    end
  end.uniq.compact
end