GitLab CI

.gitlab-ci.yml

# Before Tests
before_script:
  - bash ci/docker_install.sh > /dev/null
  - composer self-update
  - composer install --prefer-dist > /dev/null
  - cp .env.gitlab .env
  - php artisan key:generate
  - php artisan migrate:refresh

# Services
services:
  - mysql:latest

# Variables
variables:
  MYSQL_USER: homestead
  MYSQL_PASSWORD: secret
  MYSQL_DATABASE: homestead

# PHP 5.6 Apache
php:5.6-apache:
  image: php:5.6-apache
  script:
    - phpunit --colors --debug --coverage-text

# PHP 5.6 FPM
php:5.6-fpm:
  image: php:5.6-fpm
  script:
    - phpunit --colors --debug --coverage-text

# PHP 7.0 Apache
php:7-apache:
  image: php:7-apache
  script:
    - phpunit --colors --debug --coverage-text

# PHP 7.0 FPM
php:7-fpm:
  image: php:7-fpm
  script:
    - phpunit --colors --debug --coverage-text

docker_install.sh

#!/bin/bash

# We need to install dependencies only for Docker
[[ ! -e /.dockerinit ]] && exit 0

set -xe

# Update
apt-get update -yqq

# Git
apt-get install git -yqq

# Zlib
apt-get install zlib1g-dev

# PHPUnit
curl -o /usr/local/bin/phpunit https://phar.phpunit.de/phpunit.phar
chmod +x /usr/local/bin/phpunit

# PHP Extensions
docker-php-ext-install pdo_mysql
docker-php-ext-install mbstring
docker-php-ext-install zip

# Composer
curl -sS https://getcomposer.org/installer | php
mv composer.phar /usr/local/bin/composer

Can you connect to mysql container ? I try to use your script, it's seems can't connect to mysql container :(

Yes, you have to make your mysql host: mysql instead of localhost.