How would you write unit tests for a Django/Flask application?

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How to Write Unit Tests for Django and Flask Applications — A Guide for Full-Stack Python Students

Unit testing ensures reliability and confidence as your applications grow. In 2024, Django held approximately 47% of the Python web framework market, with Flask following closely at 42%. Although Django is known for its “batteries-included” structure, Flask is celebrated for its flexibility and growing popularity, dominating 58% of PyPI downloads in 2024 (up from 73% in 2023), while Django accounted for 11%, up from 10%.

To write unit tests:

Django uses Python’s unittest built-in module, enhanced by django.test.TestCase, which runs each test in isolation using transactions. Best practices include writing concise tests that focus on one behavior at a time.
Flask, meanwhile, often pairs with pytest, thanks to its terse syntax, fixtures, parametrization, and excellent output. A typical Flask test includes setting up the app context (via setUp()/tearDown()), using create_app(), and testing core logic in isolation.

Popular frameworks like pytest enable reusable fixtures, parameterized inputs, and clearer assertions, making testing scalable and maintainable.

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