pytest-backend-testing

Test a FastAPI backend with pytest by applying structured patterns across repository, service, and router layers, using TestClient for integration checks and pytest-asyncio for async routes. This Skill provides the blueprint for structuring those tests.

Mocking repositories in FastAPI service tests involves injecting mock objects into the service layer to isolate business logic from database calls. This Skill outlines how to configure mocks and fixtures to achieve reliable unit testing.

Write async tests for FastAPI routes using pytest-asyncio to handle asynchronous endpoint execution natively. The Skill covers async testing patterns to ensure your non-blocking API routes function correctly under test conditions.

Use pytest fixtures to test FastAPI router layers by setting up reusable application states and mock dependencies before each test. This Skill details fixture configurations for consistent API route testing.

Achieve 80% test coverage for a FastAPI project by combining unit, integration, and async tests across all layers, then running pytest with coverage reporting. This Skill specifies workflows to reach and verify adequate coverage.