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Python Testing Tutorials
Testing your Python code catches bugs before they reach production and helps you write reliable software. Create unit tests that verify individual functions, integration tests that check how components work together, and end-to-end tests that validate entire workflows. Testing helps you refactor with confidence and maintain code quality as projects grow.
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Robust applications rely on test frameworks likepytest andunittest, fixtures to set up test data, andmocking to isolate components. Add test coverage reporting to find untested code, implement continuous integration to run tests automatically, and follow test-driven development to design better APIs. Good tests serve as documentation and make your codebase maintainable.
Browse all resources below, or commit to a guidedLearning Path with progress tracking:
Learning Path
Exceptions, Logging, and Debugging
6 Resources ⋅Skills: Python, Exceptions, Logging, Debugging, pdb
Learning Path
Testing and Continuous Integration
8 Resources ⋅Skills: Unit Testing, Doctest, Mock Object Library, Pytest, Continuous Integration, Docker, Code Quality, Test Automation, Software Testing, CI/CD
Tests catch bugs early when they are cheaper to fix, prevent regressions when you change code, and document expected behavior. Tested code is easier to refactor and maintain. Tests give you confidence that your software works correctly.
Installpytest withpip install pytest. Create a test file starting withtest_, write functions that start withtest_, and useassert to check conditions. Run tests with thepytest command. Test functions should be small and test one thing.
Test functions and methods with different inputs including edge cases, boundary conditions, and invalid data. Test error handling, integration points between components, and critical business logic. Focus on code that is complex, important, or likely to break.
Useunittest.mock or pytest fixtures to replace real objects with mocks. Mock external services, databases, and file operations so tests run fast and don’t depend on external systems. Set return values withreturn_value and verify calls withassert_called_with().
