Individual skill
django-test-parallelization
Safely parallelize Django and pytest-django test suites with Django --parallel, pytest-xdist, test isolation checks, randomized order detection, shared-resource sharding, locks, and load balancing. Use when enabling parallel tests, diagnosing failures under parallel execution, handling flaky Django tests, or making caches, files, queues, and external resources safe across workers.
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# Django Test Parallelization
Parallel test execution is a multiplier after a suite is isolated. Treat failures under parallel execution as evidence of hidden shared state until proven otherwise.
## Readiness Workflow
1. Measure serial runtime first.
- If the suite is already dominated by startup or database creation, parallelism may not help enough on its own.
2. Check isolation before enabling parallelism as the default.
- Run in reverse order.
- Run with randomized order when reverse order is not enough.
- Preserve random seeds so failures can be reproduced.
