Merged branch docker-mysql-travis into master

.travis.yml

@@ -1,6 +1,15 @@
 language: crystal
 services:
-  - mysql
+  - docker
+env:
+  - MYSQL_DOCKER_IMAGE=mysql:5.7
+  - MYSQL_DOCKER_IMAGE=mysql:5.6
+  - MYSQL_DOCKER_IMAGE=mariadb:latest
+before_install:
+  - docker run -e MYSQL_ALLOW_EMPTY_PASSWORD=yes -p 3306:3306 -d ${MYSQL_DOCKER_IMAGE}
+  - docker ps -a # log docker image
+  - while ! echo exit | nc localhost 3306; do sleep 5; done # wait mysql to start accepting connections
+  - sleep 15
 script:
   - crystal spec
   - crystal tool format --check

spec/driver_spec.cr

@@ -50,24 +50,24 @@ describe Driver do
   it "should connect with credentials" do
     with_db do |db|
       db.scalar("SELECT DATABASE()").should be_nil
-      db.scalar("SELECT CURRENT_USER()").should eq("root@localhost")
+      db.scalar("SELECT CURRENT_USER()").should match(/^root@(localhost|%)$/)
 
       # ensure user is deleted
-      db.exec "GRANT USAGE ON *.* TO crystal_test@localhost IDENTIFIED BY 'secret'"
-      db.exec "DROP USER crystal_test@localhost"
+      db.exec "GRANT USAGE ON *.* TO crystal_test IDENTIFIED BY 'secret'"
+      db.exec "DROP USER crystal_test"
       db.exec "DROP DATABASE IF EXISTS crystal_mysql_test"
       db.exec "FLUSH PRIVILEGES"
 
       # create test db with user
       db.exec "CREATE DATABASE crystal_mysql_test"
-      db.exec "CREATE USER crystal_test@localhost IDENTIFIED BY 'secret'"
-      db.exec "GRANT ALL PRIVILEGES ON crystal_mysql_test.* TO crystal_test@localhost"
+      db.exec "CREATE USER crystal_test IDENTIFIED BY 'secret'"
+      db.exec "GRANT ALL PRIVILEGES ON crystal_mysql_test.* TO crystal_test"
       db.exec "FLUSH PRIVILEGES"
     end
 
     DB.open "mysql://crystal_test:secret@localhost/crystal_mysql_test" do |db|
       db.scalar("SELECT DATABASE()").should eq("crystal_mysql_test")
-      db.scalar("SELECT CURRENT_USER()").should eq("crystal_test@localhost")
+      db.scalar("SELECT CURRENT_USER()").should match(/^crystal_test@(localhost|%)$/)
     end
 
     with_db do |db|