Moq TargetParameterCountException with lambda expression

I have strange problem: when I use mu repository stub I get strange exception:


Creating stub (in a test method):

var repositoryStub = new Mock<IRepository<User>>();
repositoryStub.Setup(m => m.FindAll(It.IsAny<Expression<Func<User,bool>>>())).Returns(TestGlobals.TestUsers.AsQueryable<User>);


IQueryable<T> FindAll(System.Linq.Expressions.Expression<Func<T, bool>> whereExpression);

And on every call to FindAll throws that error :( I'm mocking in that fashion in many other places, but now I can't find source of that strange problem :(


You have missed a pair of parenthesis after the AsQueryable call:

repositoryStub.Setup(m => m.FindAll(It.IsAny<Expression<Func<User,bool>>>())).Returns(TestGlobals.TestUsers.AsQueryable<User>());

The Returns method has multiple overloads and most of them takes a Func and without the parenthesis it uses one of these overloads and because you haven't specified a parameter that's why it throws an exception.

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