mock

Is tortured thirst itself too sweet a cup?

Gall, and more bitter mocks, shall make it up.

Fooles make a mocke at ſinne: but among the righteous there is fauour.

He got a B in his History mock, but improved to an A in the exam.

You can, if you must, create a mock that derives from a concrete class. The problem is that the resulting class represents a mix of production and mocked behavior, a beast referred to as a partial mock.