build: use Docker containers in Travis CI

Author: dougwilson

.travis.yml

@@ -1,25 +1,28 @@
 language: node_js
 node_js:
-  - '0.6'
-  - '0.8'
-  - '0.10'
-  - '0.12'
-  - '1.8'
-  - '2.5'
-  - '3.3'
-  - '4.2.0' # Test timers regression
-  - '4.8'
-  - '5.12'
-  - '6.10'
-  - '7.6'
-
+  - "0.6"
+  - "0.8"
+  - "0.10"
+  - "0.12"
+  - "1.8"
+  - "2.5"
+  - "3.3"
+  - "4.2.0" # Test timers regression
+  - "4.8"
+  - "5.12"
+  - "6.10"
+  - "7.6"
+env:
+  - "DOCKER_MYSQL_TYPE=mysql DOCKER_MYSQL_VERSION=5.5"
 matrix:
   include:
-    - node_js: '4.8'
-      env: MYSQL_TYPE=mariadb MYSQL_HOST=localhost MYSQL_DATABASE=node_mysql MYSQL_USER=root MYSQL_PASSWORD=
-      addons: {mariadb: '10.1'}
+    - node_js: "6.10"
+      env: "DOCKER_MYSQL_TYPE=mariadb DOCKER_MYSQL_VERSION=10.1"
 
-sudo: false
+dist: trusty
+sudo: required
+services:
+  - docker
 
 cache:
   directories:
@@ -35,8 +38,18 @@ before_install:
   - "test ! -d node_modules || npm prune"
   - "test ! -d node_modules || npm rebuild"
 
+  # Setup environment
+  - "export MYSQL_DATABASE=node_mysql"
+  - "export MYSQL_USER=root"
+
+install:
+  - "docker run -d --name mysql -e MYSQL_ALLOW_EMPTY_PASSWORD=yes -e MYSQL_DATABASE=$MYSQL_DATABASE $DOCKER_MYSQL_TYPE:$DOCKER_MYSQL_VERSION"
+  - "npm install"
+  - "docker run --link mysql:db -e CHECK_PORT=3306 -e CHECK_HOST=db giorgos/takis"
+
 before_script:
-- "mysql -e 'create database node_mysql; select version();'"
+  - "docker --version"
+  - "docker exec mysql mysql -e 'select version()'"
 
 script:
   # Run test script, depending on istanbul install
@@ -46,12 +59,3 @@ script:
 
 after_script:
   - "test -e ./coverage/lcov.info && npm install coveralls@2 && cat ./coverage/lcov.info | coveralls"
-
-env:
-  - MYSQL_TYPE=mysql MYSQL_HOST=localhost MYSQL_DATABASE=node_mysql MYSQL_USER=root MYSQL_PASSWORD=
-
-mysql:
-  adapter: mysql2
-  username: root
-  encoding: utf8
-  database: node_mysql