Mocking classes that implement IQueryable with Moq

Question

I spent an evening trying to mock an object that implements IQueryable: public interface IRepo : IQueryable { } The best I could come up with is something like this: var items = new Item[] {}.AsQueryable(); var repo = new Mock(); repo.Setup(r => r.GetEnumerator()).Returns(items.GetEnumerator()); repo.Setup(r => r.Provider).Returns(items.Provider); repo.Setup(r => r.ElementType).Returns(items.ElementType); repo.Setup(r => r.Expression).Returns(items.Expression); Is there a more concise way to do the same? It would be easier to expose a property/method in IRepo that returns IQueryable and the simply mock like this: repo.Setup(r => r.GetItems()).Returns(new Items[]{ }.AsQueryable()); But this is not what I want to do =) JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

This is nothing new, just a cleaner way of doing it. I also have repositories where the repository itself is also an IQueryable, so I needed the same thing. I basically just put your code into an extension method like this at the root level of my test project, to make it available to all tests: public static class MockExtensions { public static void SetupIQueryable(this Mock mock, IQueryable queryable) where T: class, IQueryable { mock.Setup(r => r.GetEnumerator()).Returns(queryable.GetEnumerator()); mock.Setup(r => r.Provider).Returns(queryable.Provider); mock.Setup(r => r.ElementType).Returns(queryable.ElementType); mock.Setup(r => r.Expression).Returns(queryable.Expression); } } This basically just offers reusability, since you're likely to want to do this in several tests, and in each test it makes the intention clear and the mess minimal. :)