Rails: "Migrations are pending

This configuration runs successfully in circleci.

machine:
      ruby:
        version: 2.3.1
    dependencies:
      pre:
        - gem install bundler
      post:
        - bundle exec rake assets:precompile
    database:
      override:
        - bundle exec rake db:drop
        - bundle exec rake db:create RAILS_ENV=test
        - bundle exec rake db:migrate RAILS_ENV=test
    test:
      post:
        - bundle exec rake test