Tests as a Safety Net

About this app

A discount function with tiers (5 % from €100, 10 % from €500) and six pytest tests. Seven changes are applied, with the old line struck through. The tests run row by row with traffic lights, E lines and a pytest-style summary. Each change drops into the net as a ball: it is caught when a test turns red, otherwise it falls through. Two broken discount tiers slip past green tests until the missing boundary test rabatt(500) == 50 is added. Plus a refactoring that rightly stays green.

Subject: Software engineering

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