I'm a passionate web developer and systems architect. I work as an independent consultant specializing in EPiServer and search.
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I just got a System.InvalidOperationException when setting up expectations for a mocked object using Rhino Mocks. The error message read: “Use Arg<T> ONLY within a mock method call while recording. 1 arguments expected, 2 have been defined.”.
This was like the gazillionth time this has happened to me so I’m writing down the quite obvious solution here.
My code always looks something like this:
MockRepository fakes = new MockRepository();
RecipeUpdater recipeUpdater = fakes.PartialMock<RecipeUpdater>();
recipeUpdater.Stub(updater =>
updater.AddNonExistingCategories(
Arg<ICategory>.Is.Anything,
Arg<List<string>>.Is.Anything));
fakes.ReplayAll();
I always find myself doing the same thing when this happens. First I stare at the code for the test until my eyes bleed. Then I ask Google for a solution. Google always directs me to this blog entry. I try that solution only to get a null reference exception from the code that I’m trying to test. Then, depending on how tired I am, it takes me 0 to 30 minutes to realize that the reason that both exceptions are thrown is that I’ve forgotten to make the method I’m testing virtual. Doh!
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Comments
Polprav 2 years ago
Hello from Russia!
Can I quote a post in your blog with the link to you?
Joel Abrahamsson 2 years ago
Hey Polprav!
Of course you can, as long as you don't copy the whole post and just pieces of it.
Daniel 1 years ago
Excellent post, you've just helped me with the same problem. Thanks very much!! :-D
Kevin 9 months ago
Thanks! I've done a google search for this issue a few times after forgetting and each time run into your blog post and remember