module Minitest::Assertions

def assert_raises *exp
  msg = "#{exp.pop}.\n" if String === exp.last
  begin
    yield
  rescue Minitest::Skip => e
    return e if exp.include? Minitest::Skip
    raise e
  rescue Exception => e
    expected = exp.any? { |ex|
      if ex.instance_of? Module then
        e.kind_of? ex
      else
        e.instance_of? ex
      end
    }
    assert expected, proc {
      exception_details(e, "#{msg}#{mu_pp(exp)} exception expected, not")
    }
    return e
  end
  exp = exp.first if exp.size == 1
  flunk "#{msg}#{mu_pp(exp)} expected but nothing was raised."
end