Error: Invariant Violation: findAllInRenderedTree(...): instance must be a composite component
A composite component is a component which contains React Component (not div, span, ...) The method 'findRenderedDOMComponentWithTag' takes in parameter a composite component.
Try to parse the component directly in your case (jquery, js, ...) because it is not a composite one
This is late, but I just ran into this, and I haven't found a great answer for it.
My solution was to make a wrapper component in the test file
import { Component } from "react";class Wrapper extends Component { render() { return <YourComponent {...this.props} /> }}and instead of calling
TestUtils.renderIntoDocument( <YourComponent />);call
TestUtils.renderIntoDocument( <Wrapper />);Doing this ensures that your component is a composite component and isn't a stateless function.
Hope this helps anyone else in the future!