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What is the alternative? If you write a complete implementation of an interface for test purposes, can you actually be certain that your version of x.isEmpty() behaves as the actua…

Once you start writing adapters you need a way to instantiate them to choose between implementations, and factories is often used for this. Then you might generalize the test suite…

Before Mockito, it was common (where I worked) to create an interface just to support testing. This is an anti-pattern in my opinion. To create interfaces just for testing complica…