Black box testing � not based on any knowledge of internal design or code. Tests are based on requirements and functionality. � White box testing � based on knowledge of the internal logic of an application's code. Tests are based on coverage of code statements, branches, paths, conditions. � Unit testing � the most 'micro' scale of testing; to test particular functions or code modules. Typically done by the programmer and not by testers, as it requires detailed knowledge of the internal program design and code. Not always easily done unless the application has a well-designed architecture with tight code, may require developing test driver modules or test harnesses.
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