add configuration to mysql image and remove prepare-tests

Author: wojsmol

.circleci/config.yml

@@ -11,6 +11,11 @@ jobs:
           MYSQL_PASSWORD: password1
           MYSQL_HOST: 127.0.0.1
     - image: circleci/mysql:5.7
+      environment:
+          MYSQL_DB: wp_cli_test_scaffold
+          MYSQL_USER: wp_cli_test
+          MYSQL_PASSWORD: password1
+          MYSQL_HOST: 127.0.0.1
     steps:
     - checkout
     - run: |
@@ -22,7 +27,6 @@ jobs:
         echo -e "memory_limit = 1024M" | sudo tee /usr/local/etc/php/php.ini > /dev/null
     - run: |
         composer install
-        composer prepare-tests
     - run: |
         echo 'export PATH=$HOME/wp-cli/package-tests/vendor/bin:$PATH' >> $BASH_ENV
         source $BASH_ENV