Testing

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Testing is matching output produced by your Python code with your expectations.

Testing strategy is what you test and how you do it. There are multiple strategies that can be combined:

unit tests - your Python code is limited by specific function and methods
performance - measure performance over the time
fuzz testing - overload your inputs with garbage to see the response
web testing - code is server-side and expected output is web stuff
acceptance - write testing logic once, and run it over a set of desired output

See PythonTestingToolsTaxonomy for more details.