Jan Giacomelli • 11/27/2025

Time Travel in Your Tests with freezegun

This article explains how to test time-dependent code using the freezegun library in Python. It covers the problem of flaky tests when dealing with subscriptions, trial eligibility, and date calculations. The solution involves patching datetime.now() and other time functions to return fixed values. The article provides code examples showing decorator usage, context managers, moving through time within tests, freezing specific times, and allowing time to tick forward. It includes a complete example testing a subscription model with active status and days remaining calculations.

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#Python #testing #mocking