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In this talk, I will be using Java and make a number of assumptions - you know what a test double is, and how to write a JUnit test case. What I say here is equally applicable if you are a C++, C# or another language developer. Test doubles are an integral part of your testing toolkit. There are five types of test doubles that we commonly speak about, Dummy, Fake, Mock, Spy, Stub. In this section, I will focus on Stubs, MockMocks, and Spies. It is a commonly held view that a Dummy, Fake, Spy, and Stub are Mocks. They are not. Each one is a type-of Test Double with a very specific purpose. A Mock and Spy can be categorized as interaction Test Doubles - they focus on peering on the inside of CUT to ensure that it behaves as expected and that the CUT interacts with the Mock and Spy as expected. There are lots of Mocking frameworks out there, I am using Mockito in my discussion. |
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