Introduction

This page is to capture how to go about testing with FAST API

Comparison to Jest

Here is a table to help compare terminology

Concept	Jest	pytest
Test setup	`beforeEach`, `beforeAll`	Fixtures (function, module, session scope)
Test teardown	`afterEach`, `afterAll`	Fixture finalizers / yield fixtures
Dependency injection	Manual mocks, passing objects	Fixture injection by name
Auto‑applied setup	Global `beforeEach` in setup files	`@pytest.fixture(autouse=True)`
Mocking	`jest.mock`, `jest.spyOn`	`monkeypatch.setattr`, `unittest.mock.patch`
Test data factories	Helper functions	Fixtures returning objects