帮助Ruby Koans#6 - 遇到了什么异常？

Question

我正试图通过Koans学习Ruby,但我坚持第6步.

这是代码:

def test_you_dont_get_null_pointer_errors_when_calling_methods_on_nil  
  # What happens when you call a method that doesn't exist.    
  # The following begin/rescue/end code block captures the exception and  
  # make some assertions about it.  

  begin
    nil.some_method_nil_doesnt_know_about
  rescue Exception => ex
    # What exception has been caught?
    assert_equal __, ex.class

    # What message was attached to the exception?
    # (HINT: replace __ with part of the error message.)
    assert_match(/__/, ex.message)
  end
end

我知道我应该用错误消息"NoMethodError"替换__,但我似乎无法弄明白.

这是我运行"path_to_enlightenment.rb"时收到的错误消息:

The answers you seek...
  <"FILL ME IN"> expected but was  <NoMethodError>.

我真的很感激这方面的一些指导 - 它让我疯了!我很想知道答案和可能的解释.谢谢!

Answer 1

这里的答案是"NoMethodError"

你需要在两边的项目,相同,因此使它们ex.class将这样做.

然后你需要继续/ __ /下面.