How do you measure and improve test coverage in a Django project? Django प्रोजेक्ट में टेस्ट कवरेज को कैसे मापें और बेहतर बनाएं?

The coverage.py library, run alongside Django's test suite (coverage run manage.py test), tracks which lines of source code were actually executed during the test run, and coverage report/coverage html produce a summary showing the percentage of covered lines per file, highlighting exactly which lines were never exercised by any test.

High coverage doesn't guarantee correctness — a test can execute a line without actually asserting anything meaningful about its behavior — so coverage is best treated as a tool for finding untested code paths (especially error-handling branches and edge cases that are easy to forget) rather than a target number to chase for its own sake. CI pipelines commonly enforce a minimum coverage threshold to prevent untested code from being merged.

# Run tests with coverage tracking
coverage run --source='.' manage.py test
coverage report -m
coverage html  # generates browsable HTML report