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I'm trying to write a unit test for a method which looks like this: public int Save(IEnumerable<int> addedIds, IEnumerable<int> removedIds) { var existingIds = repository.Get(); IEnumerable<int> ids = existingIds.Except(removedIds).Union(addedIds)); return repository.Create(ids); } The test in Moq looks like this: repository.Setup(r => r.Get()).Returns(CreateList()); service.Save(addedIds, removedIds); repository.Verify(r => r.Create(It.Is<IEnumerable<int>>(l => VerifyList(l)))); This fails, with this error , and VerifyList() is never called: Expected invocation on the mock at least once, but was never performed: r => r.Create(It.Is<IEnumerable'1>(list => VerifyList(list))) Performed invocations: IRepo.Create(System.Linq.Enumerable+<UnionIterator>d__88'1[System.Int32]) As the invoked type is not IEnumerable<int> but is in fact System.Linq.Enumerable+<UnionIterator>d__88'1[System.Int32]) , the test fails. (Stepping through the test, everything is happening correctly and the results are as expected) If I call ids.ToList() in the method under test, these are the results: Expected invocation on the mock at least once, but was never performed: r => r.Create(It.Is<List'1>(l => VerifyList(l))) Performed invocations: IRepo.Create(System.Collections.Generic.List'1[System.Int32]) Is there any way round this? Or am I doing something wrong? Edit: it turns out I had a mistake in my VerifyList method so it was returning false, but Moq wasn't giving me that information. The type difference is a red herring..

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