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Mock Articles

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All About Jest, Timers, and Mocks

3/30/2026 • EN

All About Jest, Timers, and Mocks

Analysis of flaky Jest tests caused by wall-clock assertions on timer behavior, with solutions using fake timers.

Flaky Tests jest Mock Node.js Timers

Mock objects and non-existent attributes/methods in Python

1/11/2016 • EN

Mock objects and non-existent attributes/methods in Python

Explains how Python's Mock objects handle non-existent attributes and methods, focusing on special behavior for 'assert' prefixes.

Attribute Error Mock Python testing unit testing