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Description
DOM Testing Library
version: 6.1.0node
version: 11.15.0npm
(oryarn
) version: 1.17.3
Problem description:
I'm seeing this intermittent error in my tests:
TypeError: Cannot read property 'nodeType' of null
at copy (node_modules/@sheerun/mutationobserver-shim/MutationObserver.js:504:45)
at clone (node_modules/@sheerun/mutationobserver-shim/MutationObserver.js:533:11)
at createMutationSearcher (node_modules/@sheerun/mutationobserver-shim/MutationObserver.js:178:25)
at MutationObserver.observe (node_modules/@sheerun/mutationobserver-shim/MutationObserver.js:110:21)
at Promise (node_modules/@testing-library/dom/dist/wait-for-element.js:31:14)
at waitForElement (node_modules/@testing-library/dom/dist/wait-for-element.js:22:10)
at asyncWrapper (node_modules/@testing-library/dom/dist/wait-for-element.js:67:54)
at node_modules/@testing-library/react/dist/pure.js:51:22
at batchedUpdates$1 (node_modules/react-dom/cjs/react-dom.development.js:21643:12)
at act (node_modules/react-dom/cjs/react-dom-test-utils.development.js:1002:14)
at act (node_modules/react-dom/cjs/react-dom-test-utils.development.js:1418:12)
at asyncAct (node_modules/@testing-library/react/dist/act-compat.js:118:12)
Unfortunately it's a heisenbug which only seems to reproduce (sometimes) when running the full suite of tests in our proprietary codebase.
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