What does the it ('renders without crashing', () = > {}) statement in the code mean?

problem description

the environmental background of the problems and what methods you have tried

related codes

/ / Please paste the code text below (do not replace the code with pictures)

it ("renders without crashing", () = > {
const div = document.createElement (" div");
ReactDOM.render (< App / >, div);
ReactDOM.unmountComponentAtNode (div);
});

what result do you expect? What is the error message actually seen?

Jan.08,2022
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3834d-40681.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3834d-40681.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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