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I want to test method A of my class, but without calling the actual method B which is normally called by A. That's because B has a lot of external interactions I don't want to test for now.
I could create mocks for all the services called by B, but that's quite some work. I'd rather just mock B and make it return sample data.
Is that possible to do with Moq framework?
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First, we instantiate the FakeDbArticleMock class and indicate which setup we want to use for this test. Then, it is necessary to instantiate the repository we want to test and inject the mock instance into it. Finally, we call the method we are testing and assert the results.
You can use Moq to create mock objects that simulate or mimic a real object. Moq can be used to mock both classes and interfaces. However, there are a few limitations you should be aware of. The classes to be mocked can't be static or sealed, and the method being mocked should be marked as virtual.
Using Moq, you can mock out dependencies and make sure that you are testing the code in isolation. Moq is a mock object framework for .
We can mock runInGround(String location) method inside the PersonTest class as shown below. Instead of using mock(class) here we need to use Mockito. spy() to mock the same class we are testing. Then we can mock the method we want as follows.
It is, with a catch!
You have to make sure method B is virtual and can be overriden.
Then, set the mock to call the base methods whenever a setup is not provided. Then you setup B, but don't setup A. Because A was not setup, the actual implementation will be called.
var myClassMock = new Mock<MyClass>();
myClassMock.Setup(x => x.B()); //mock B
myClassMock.CallBase = true;
MyClass obj = myClassMock.Object;
obj.A(); // will call the actual implementation
obj.B(); // will call the mock implementation
Behinds the scenes, Moq will dynamically create a class that extends MyClass and overrides B.
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