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c#unit-testingmockingmoq
David says Reinstate Monica
David says Reinstate Monica

Reputation: 20129

Moqed method returning null instead of string

I'm using Moq for some C# testing. For some reason, I'm getting a null back instead of a string. I'm trying to test

public void Foo(IData data){
    _value = data.GetValue<T>(someString);
}

interface IData
{
    T GetValue<T>(string someString);
}

and in my test code I have

Mock<IData> dataMock = new Mock<IData>();
dataMock.Setup(x => x.GetValue<string>(It.IsAny<string>())).Returns("blah");
Foo(dataMock.Object);

But when I step through, _value gets assigned null. Shouldn't it be assigned "blah"?

Upvotes: 1

Views: 255

Answers (1)

StriplingWarrior
StriplingWarrior

Reputation: 156459

Most likely the generic T parameter in your call to GetValue is not string, so the Setup condition is not matched. By default Moq will return default values (null in this case) from method calls that haven't been explicitly Setup, unless you tell it to be "strict."

// tell Moq to throw an exception if someone calls a method that you haven't `Setup`
Mock<IData> dataMock = new Mock<IData>(MockBehavior.Strict);

Upvotes: 1

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