currently I am creating a custom web component and I want to use mocha as my testing framework. Is there a way to check whether the component that I created is inserted into the DOM?
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Mocha is mostly just a framework to describe your tests and assert things. For checking whether a component you created is in the DOM, you can probably use plain old JavaScript with document.querySelector or document.getElementById. But yes, you would use that together with Mocha to write your test.