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The test coverage is currently at 67%. It would be good to be able to automatically test more things in the test suite. You can see which files are covered at https://coveralls.io/github/Zulko/moviepy (or PyCharm has a test coverage plugin that can be enabled).
In particular:
For the video tests it is better to use BitmapClip because it allows you to test pixel-perfect effects. But generally just testing that an action can be performed without crashing is better than nothing.