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fix(pretty-format): Handle empty string children in React same as react-test-renderer #14470

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SimenB
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@SimenB SimenB commented Sep 5, 2023

Summary

I tried to upgrade the entire repo to React 18 (for #14463), and it turns out react-test-renderer@18 has a change in how it handles empty string children. Which is fine, but aligning is a breaking change in Jest.

Test plan

Adjusted the test

@SimenB SimenB added this to the Jest 30 milestone Sep 5, 2023
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@@ -21,7 +21,7 @@ const getChildren = (arg: unknown, children: Array<unknown> = []) => {
arg.forEach(item => {
getChildren(item, children);
});
} else if (arg != null && arg !== false) {
} else if (arg != null && arg !== false && arg !== '') {
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this is the breaking change

assertPrintedJSX(
React.createElement('Mouse', null, ''),
'<Mouse>\n \n</Mouse>',
);
assertPrintedJSX(React.createElement('Mouse', null, ''), '<Mouse />');
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this shows the change that will show up in people's snapshots

@SimenB SimenB force-pushed the align-pretty-format-and-test-renderer-single-string-child branch from 6350ca8 to f0fefae Compare September 8, 2023 08:26
@SimenB SimenB enabled auto-merge (squash) September 19, 2023 08:19
@SimenB SimenB merged commit 149383e into jestjs:main Sep 19, 2023
3 of 7 checks passed
@SimenB SimenB deleted the align-pretty-format-and-test-renderer-single-string-child branch September 19, 2023 11:16
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SimenB commented Sep 19, 2023

I missed this made the tests time out on circle ci... 1a96a5c fixes it

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