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[tests] <StrictMode /> nested in tree is broken #31825

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merged 1 commit into from
Dec 18, 2024
Merged

[tests] <StrictMode /> nested in tree is broken #31825

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34 changes: 34 additions & 0 deletions packages/react/src/__tests__/ReactStrictMode-test.internal.js
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Original file line number Diff line number Diff line change
Expand Up @@ -179,6 +179,40 @@ describe('ReactStrictMode', () => {
'B: useEffect mount',
]);
});

it('should support nested strict mode on initial mount', async () => {
function Wrapper({children}) {
return children;
}
await act(() => {
const container = document.createElement('div');
const root = ReactDOMClient.createRoot(container);
root.render(
<Wrapper>
<Component label="A" />
<React.StrictMode>
<Component label="B" />,
</React.StrictMode>
,
</Wrapper>,
);
});

expect(log).toEqual([
'A: render',
'B: render',
'B: render',
'A: useLayoutEffect mount',
'B: useLayoutEffect mount',
'A: useEffect mount',
'B: useEffect mount',
// TODO: this is currently broken
// 'B: useLayoutEffect unmount',
// 'B: useEffect unmount',
// 'B: useLayoutEffect mount',
// 'B: useEffect mount',
]);
});
}
});
});
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