react19-test-patterns
React 19 Test Migration Patterns
Reference for all test file migrations required by React 19.
Priority Order
Fix test files in this order; each layer depends on the previous:
actimport fix first, it unblocks everything elseSimulate→fireEventfix immediately after act- Full react-dom/test-utils cleanup remove remaining imports
- StrictMode call counts measure actual, don't guess
- Async act wrapping for remaining "not wrapped in act" warnings
- Custom render helper verify once per codebase, not per test
1. act() Import Fix
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