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Showing content from https://enzymejs.github.io/enzyme/docs/api/ShallowWrapper/isEmptyRender.html below:

isEmptyRender() ยท Enzyme

.isEmptyRender() => Boolean

Returns whether or not the wrapper would ultimately render only the allowed falsy values: false or null.

Returns

Boolean: whether the return is falsy

Example
function Foo() {
  return null;
}

const wrapper = shallow(<Foo />);
expect(wrapper.isEmptyRender()).to.equal(true);

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