title: Enzyme Test Code Memory cleanup
body: <p>I have been looking at a lot of examples for testing react and redux applications using Enzyme and Jest, and there are very few that even mention code cleanup. When using <code>shallow</code> or <code>mount</code> do you not explicitly need to call <code>unmount</code> or <code>detach</code> to try to keep the memory bloat and runtime down?</p>