Question

if I do not use a mock framework to create a mock, but write my own mock which inherits the to be mocked class, and overwrites the specific method that I want to mock.
What is this called? Dummy? Fake? Stub

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Answer 1

Those kind of objects are still “mock” objects.

From Wikipedia, on the definition of a mock object:

In object-oriented programming, mock objects are simulated objects
that mimic the behavior of real objects in controlled ways

And this is exactly what mock objects do, be them generated by a mocking framework or manually implemented in the unit tests