I'm a passionate web developer and systems architect living in Stockholm, Sweden. I work at Valtech and I am an EMVP.
About web development with ASP.NET and EPiServer, fatherhood and other adventures in my digital jungle
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 10 months ago
Hello from Russia!
Can I quote a post in your blog with the link to you?
Joel Abrahamsson 10 months ago
Hey Polprav!
Of course you can, as long as you don't copy the whole post and just pieces of it.