An introductory crash course on pytest, Python's primary testing framework. Covers what pytest is, why it matters for testing Python applications (including LLM and Playwright-based apps), how to install it via pip, and how to write and run your first tests. Key conventions explained include naming test files with 'test_' prefix or '_test' suffix, naming test functions with 'test_' prefix, using the built-in assert statement, and running tests with the pytest command including the -v verbose flag.
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