Python - Testing an abstract base class

Question

I am looking for ways / best practices on testing methods defined in an abstract base class. One thing I can think of directly is performing the test on all concrete subclas

Answer 1

No, it's not. The very purpose of abc is to create classes that cannot be instantiated unless all abstract attributes are overridden with concrete implementations. Hence you need to derive from the abstract base class and override all abstract methods and properties.