Wikipedia:
In computer programming, a callback is a reference to executable code, or a piece of executable code, that is passed as an argument to other code. This allows a lower-level software layer to call a subroutine (or function) defined in a higher-level layer.
The key requirement in a verification environment that can be re-used for all tests without any changes is the presence a "hook" where the test program can inject new code without modifying the original classes.
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