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Mockito is a mocking library used to create faked instances of classes. The class doesn't need to exist yet; we can create a mock from an interface or a parent class.
Mockito can also create spies, which intercept existing methods and check if and how they are called. The demonstration unit test uses spies.
Mockito has JUnit as a dependency. To avaoid JUnit version number conflict, we back the Junit version from 5.5.1 to 5.1.1, which is what this verison of Mockito wants.