Jest in React Expected ref to be a function, a string, an object returned by React.createRef(), or null.

by frank · January 20, 2021

Expected ref to be a function, a string, an object returned by React.createRef(), or null.

test('MultipleFormAggregator to prevent an invalid form submit two times in a row', () => {

const formAggregatorRef = useRef<MultipleFormAggregatorRef>(null);

const component = renderer.create(

<div>

</div>,

);

(...)

});

Solution

Create a jig, dont use ref in your test code.

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