Overview
Your complete guide to Code quality and testing
Build step five: before you ship your app, make sure it works and keeps working. Three lessons: fast unit tests, integration tests against a real database, and clean code you refactor safely.
Non-technical and technical learners alike. Every part opens two ways in: a plain path built on an analogy for someone starting from zero, and a detailed path for someone who knows the basics and wants depth.
An animation, then what you need before you start, then the idea with code you run, then a worked example, then review cards and "test your understanding" questions.
Do not leave a part before you can answer its questions without guessing. Reading alone proves nothing.
Pick a topic
A look at Code quality and testing
You start with the smallest test, then join the pieces in an integration test, then use both as a safety net for cleaning the code.
| Part | Topic | You learn |
|---|---|---|
| 1 | Unit tests | The AAA pattern, pytest, edge cases and mocks |
| 2 | Integration tests | The test pyramid, a test database, API tests, and isolation between tests |
| 3 | Clean code and refactoring | Naming, small functions, early returns and safe refactoring |
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