module Minitest::Line

def describes_with_lines(target_file)
  runnables.map do |runnable|
    next unless caller = runnable.instance_variable_get(:@minitest_line_caller)
    next unless line = caller.detect { |line| line.include?(target_file) }
    ["/#{Regexp.escape(runnable.name)}/", line[/:(\d+):in/, 1].to_i]
  end.compact
end

def methods_with_lines(target_file)
  runnables.flat_map do |runnable|
    rname = Class.instance_method(:name).bind(runnable).call
    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

def runnables
  Minitest::Runnable.runnables
end

def target_file
  runnables.each do |r|
    r.runnable_methods.each do |m|
      file, line = r.instance_method(m).source_location
      return file if file
    end
  end
  nil
end

def tests_with_lines
  target_file = target_file()
  methods_with_lines(target_file).concat describes_with_lines(target_file)
end