How can I use NSubstitute for advanced mocking in my tests?

How can I use NSubstitute for advanced mocking in my tests?

NSubstitute is a powerful mocking framework for .NET. You can create substitutes for interfaces and classes easily. What specific advanced mocking scenarios are you interested in?

I want to mock a method that returns a value based on input parameters.

You can use the When method to specify the behavior of the mock. For example: substitute.When(x => x.Method(input)).DoNotCallBase(); This allows you to define custom return values.

Can I also verify that a method was called with specific parameters?

Yes, you can use the Received method to verify calls. For instance: substitute.Received().Method(expectedInput); This checks if the method was called with the expected parameters.

What about handling exceptions in mocked methods?

You can use the Throws method to simulate exceptions. For example: substitute.When(x => x.Method()).Throw(new Exception("Error")); This will throw an exception when the method is called.