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According to the docs, when trying to do visual diff testing and running bok-choy with pytest, all that is needed to create initial baseline shots is to set the environment variable NEEDLE_SAVE_BASELINE. However this does not work because the code that checks for this environment variable is in the setUpClass method of NeedleTestCase which is skipped by BokChoy's WebAppTest setUpClass method so setting the environment variable has no effect when running test cases and instead throws an error.