Web Reference: Extracting an interface allows isolating only common interfaces, not common code. In other words, if classes contain Duplicate Code, extracting the interface won’t help you to deduplicate. Mar 19, 2022 · So to directly answer your question: yes it is perfectly acceptable to define an interface for testing purposes as long as that interface represents behavior that should be mocked, stubbed, or faked in your tests. Oct 11, 2024 · Let's extract interface from the class that implements AnInterface. Depending on whether we want AnotherInterface (extracted interface) to extend the AnInterface (existing one) or we want source AClass to implement them both, we will get the following code:
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