The trick when we are writing unit tests for new code is to test classes as independently as possible. When you start to notice that your tests are too large, you should break down the class that you are testing, to make smaller independent pieces that can be tested more easily. At times, you will have to fake out collaborators because the job of a unit test isn’t to see how a cluster of objects behaves together, but rather how a single object behaves. We can test that more easily through a fake.
