Returning null values from a Unit Test with Moq

In some cases when you are writing Unit Tests with Moq, you may have to return a null value from your Mocked object.

Unfortunately, if you directly attempt to return null from a Mocked object though, you will receive an error message.

Therefore, how do you return null from a Mocked object?

Well, the answer is deceptively simple!  You simply assign a null value to the expected object and simply return that null object as follows:

	Mock<IRepository> repo = new Mock<IRepository>();
	MyClass returnValue = null;
	repo.Setup(r => r.GetById(It.IsAny<string>())).Returns(returnValue);

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