title: How to rollback, reset, or drop Ecto test database?
body: <p>Usually <code>mix.test</code> cleans the test database, but it is not working. </p>
  
  <p>It may be because I was playing around with making a <code>users</code> 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.</p>
  
  <p>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. </p>