> Have I just made something public in order to test it? > > If yes, consider instead writing higher level tests that each each test more of the code.

This is one that I struggle with in JS with React.js components. If you have a little helper component in a file that isn't exported but used in the same file by a component that is exported, it is sometimes difficult to test that non-exported component. Because of how enzyme shallow rendering works you don't get the full tree so that component, if sufficiently nested, might not ever be touched. This forces me to export the component just to test it.

example: https://imgur.com/a/gqgcS