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Hypothesis is the Python tool used for property based testing. Hypothesis claims to combine "human understanding of your problem domain with machine intelligence to improve the quality of your testing process while spending less time writing tests." In this episode Alexander Hultnér introduces us to property based testing in Python with Hypothesis. Some topics covered: What is property based testing Thinking differently for property based testing Using hypothesis / property based testing in conjunction with normal testing Failures saved and re-run What parts of development/testing is best suited for hypothesis / property based testing Comparing function implementations Testing against REST APIs that use Open API / Swagger with schemathesis Changing the number of tests in different test environments System, integration, end to end, and unit tests Special Guest: Alexander Hultnér.