Testing Pytest

Pytest discovers and executes tests automatically from your project structure. Install pytest, write test functions prefixed with `test_`, then run `pytest` from your project root. Pytest finds modules, executes tests in order, and reports results with clear failure messages and stack traces.

Organize tests in dedicated test files and directories; use fixtures to manage setup and teardown. Pytest fixtures provide reusable test dependencies through function parameters, support scoping (function, module, session), and enable parameterized test execution across multiple input sets.

Create a pytest.ini file to standardize discovery rules, reporting format, and plugin configuration across environments. Configure output formats for CI systems, set execution flags, and enable plugins for enhanced reporting so tests run consistently in automation.

Pytest parameterization lets you run the same test function across multiple input values and expected outputs in a single declaration. This reduces code duplication, tests edge cases systematically, and generates separate reports for each parameter combination.

Standardized test structure and naming conventions improve readability, maintenance, and discoverability across modules. Pytest conventions—clear test names, consistent fixtures, and organized files—make tests self-documenting and enable teams to locate and understand failures quickly.