Usually mix.test
cleans the test database, but it is not working.
It may be because I was playing around with making a users
schema, but didn't want to use what I made so I got rid of it. I then started over and made a new schema for users which was different from the first.
When I tried to run mix test again, there was an error that some fields did not exist which should have been there with the new schema.
question from:https://stackoverflow.com/questions/42162347/how-to-rollback-reset-or-drop-ecto-test-database