Rails ActiveSupport:如何断言发生错误? [英] Rails ActiveSupport: How to assert that an error is raised?

问题描述

我想在我的一个模型上测试会引发特定错误的函数.该函数看起来像这样:

I am wanting to test a function on one of my models that throws specific errors. The function looks something like this:

def merge(release_to_delete)
  raise "Can't merge a release with itself!" if( self.id == release_to_delete.id )
  raise "Can only merge releases by the same artist" if( self.artist != release_to_delete.artist   )
  #actual merge code here
end

现在，我想做一个断言，当我使用导致每个异常的参数调用此函数时，实际上会抛出该异常.我当时在看ActiveSupport文档，但没有发现任何有希望的东西.有什么想法吗?

Now I want to do an assert that when I call this function with a parameter that causes each of those exceptions, that the exceptions actually get thrown. I was looking at ActiveSupport documentation, but I wasn't finding anything promising. Any ideas?

推荐答案

因此，ActiveSupport中并没有真正进行单元测试. Ruby在标准库中提供了一个典型的xunit框架(ruby 1.8.x中为Test :: Unit，ruby 1.9中为MiniTest)，activesupport中的内容只是在其中添加了一些内容.

So unit testing isn't really in activesupport. Ruby comes with a typical xunit framework in the standard libs (Test::Unit in ruby 1.8.x, MiniTest in ruby 1.9), and the stuff in activesupport just adds some stuff to it.

如果您使用的是Test :: Unit/MiniTest

If you are using Test::Unit/MiniTest

assert_raise(Exception) { whatever.merge }

如果您使用的是rspec(很遗憾，文献记录不多，但更受欢迎)

if you are using rspec (unfortunately poorly documented, but way more popular)

lambda { whatever.merge }.should raise_error

如果要检查凸起的Exception:

exception = assert_raises(Exception) { whatever.merge }
assert_equal( "message", exception.message )

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