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Testing the untestable: a beginner’s guide to mock objects

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Andrew Burrows - Testing the untestable: a beginner’s guide to mock objects [EuroPython 2016] [22 July 2016] [Bilbao, Euskadi, Spain] (https://ep2016.europython.eu//conference/talks/testing-the-untestable-a-beginners-guide-to-mock-objects)

In this session you will learn your way around Python 3’s unittest.mock package through examples. You’ll learn about the Mock class, sentinels and patching. You will see the benefits that mocks can bring and learn to avoid the pitfalls. Along the way I’ll fill you in on some of the bewildering terminology surrounding mocks such as “SUT”, “Stub”, “Double”, “Dummy” , “mockist” and more and I’ll give a brief plug for my own mockextras package that can enhance your mock experience.


Mock objects can be a powerful tool to write easy, reliable tests for the most difficult to test code. In this session you will learn your way around Python 3’s unittest.mock package starting at the simplest examples and working through progressively more problematic code. You’ll learn about the Mock class, sentinels and patching and how and when to use each of them. You will see the benefits that mocks can bring and learn to avoid the pitfalls. Along the way I’ll fill you in on some of the bewildering terminology surrounding mocks such as “SUT”, “Stub”, “Double”, “Dummy” , “mockist” and more and I’ll give a brief plug for my own mockextras package that can enhance your mock experience.

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