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
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