added service mysql

.gitlab-ci.yml

 image: node:6
 
+# Install node libraries
 before_script:
   - npm install
   
+# Run JEST tests
 test:
   script:
     - npm test
     
+# Publish coverage report on gitlab-pages
 pages:
   stage: deploy
   script:
@@ -18,3 +21,18 @@ pages:
     - public
   only:
   - master
+
+# Set up MySQL test-database
+services:
+  - mysql:latest
+
+# Configure test-database
+variables:
+  MYSQL_DATABASE: db
+  MYSQL_ROOT_PASSWORD: password
+  
+# Create database tables
+connect:
+  image: mysql
+  script:
+  - echo "SELECT 'OK';" | mysql --user=root --password="$MYSQL_ROOT_PASSWORD" --host=mysql "$MYSQL_DATABASE" < create_tables.sql

create_tables.sql

+CREATE TABLE`person` (
+  `id` int(11) NOT NULL,
+  `navn` varchar(256) NOT NULL,
+  `alder` int(3) DEFAULT NULL,
+  `adresse` varchar(256) NOT NULL,
+  `bilde_base64` longtext
+) ENGINE=InnoDB DEFAULT CHARSET=latin1;
\ No newline at end of file