Moq - Linq expression in repository - Specify expression in setup

Question

I have a method on my interface that looks like:

T GetSingle(Expression> criteria);

I\'m trying to mock the setup som

Answer 1

I managed to get this to work:

Expression<Func<User, bool>> expr = user => user.EmailAddress == "a@b.com";

_mockUserRepository.Setup(c => c.GetSingle(It.Is<Expression<Func<User, bool>>>(criteria => criteria == expr)))
    .Returns(new User { EmailAddress = "a@b.com" });

User result = _mockUserRepository.Object.GetSingle(expr);

Answer 2

If you don't mind a generic set up, it can be simpler like this.

_mockUserRepository.Setup(c => c.GetSingle(It.IsAny<Expression<Func<User, bool>>>()))
    .Returns(new User { EmailAddress = "a@b.com" });