Efficient FastAPI testing with pytest, dependency injection and snapshots
summary
Claim: using FastAPI dependency injection, pytest factory fixtures, and snapshot testing cuts maintenance and catches unintended API changes. Demonstration builds a simple to‑do API with both SQLite and an in‑memory repository, adds a required priority field and shows how hundreds of tests would break but require only a single factory change to fix. Uses a fixed UID provider so snapshots remain stable, runs faster when swapping in-memory repo, and the approach works in the demo.
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chapters (9)
- 0:00Introduction
- 1:11Purpose of automated testing
- 7:35Common testing problems
- 16:19Factory fixtures for tests
- 20:21Using snapshots in testing
- 21:45Dependency injection in FastAPI
- 27:11Implementing efficient tests
- 33:12Comparing test approaches
- 35:57Q&A
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