Pytest

A popular library for testing in Python, valued for its simple syntax and high flexibility. It makes it possible to quickly write unit, integration, and functional tests using clear assertions and a fixture mechanism for managing test dependencies. It works well for both small projects and large systems with extensive test sets. Pytest offers an extensive plugin ecosystem and support for parameters, markers, and parallel testing. Thanks to its intuitive command-line interface and clear error reports, Pytest is one of the most popular tools for ensuring quality in Python-based applications.