Fokko commented on issue #3691: [AIRFLOW-2846] Add missing python test dependency to setup.py URL: https://github.com/apache/incubator-airflow/pull/3691#issuecomment-410503637 In case who missed it: https://www.youtube.com/watch?v=5Il3w2P7IcM Awesome work @holdenk for getting people inspired to contribute to open source software! I've checked. The tox version being installed with `apt-get` by Travis is also 3.1.3. Not completely sure why this failed :-) In the end we should rely less on Travis and move to a Dockerized setup to make testing easier. There is a great effort going on in https://github.com/apache/incubator-airflow/pull/3393/ but there are still some lose ends that need to be fixed before we can merge it.
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