React testing library waitfor mutationobserver is not a constructor
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Jun 14, 2015 · Testing component methods. It's not uncommon to have a few methods attached to the React component and to need to test them. An example might be a method that performs some complex transforms on data sent in via the props. If you stick to pure functions on your React components then it's much easier to unit test them.
The default container is the global document.Make sure the elements you wait for will be attached to it, or set a different container.. The default timeout is 4500ms which will keep you under Jest's default timeout of 5000ms.. The default mutationObserverOptions is {subtree: true, childList: true, attributes: true, characterData: true} which will detect additions and removals of child elements ...