Programming Testing: Seams

Seams are places where you can alter the behaviour of a program when it is under test.
The available seams depend on the programming language in use.
When designing a program for testing, you should provide seams to allow it to be tested.

PreProcessor Seams

TODO:

untested

In C/C++ and other languages with macros,
you can use an #ifdef to inject or replace test methods.