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19

answers:

1

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

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?

+1  A: 

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.

If you are using Test::Unit/MiniTest

assert_raise Exception { whatever.merge }

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

lambda { whatever.merge }.should raise_error
Matt Briggs
Thanks! I had to use "RuntimeError" instead of exception though, like this:assert_raise( RuntimeError ){ artist1.merge(artist1) }This guide was extremely helpful: http://guides.rubyonrails.org/testing.html
spilliton