TravisCI build improvements

Author: Sergei Antipov

.travis.yml

@@ -4,8 +4,17 @@
 sudo: required
 env:
   - >
-    distribution=ubuntu-upstart
-    version=14.04
+    DISTRIBUTION=ubuntu-upstart
+    DIST_VERSION=14.04
+    MONGODB_VERSION=3.2
+  - >
+    DISTRIBUTION=ubuntu-upstart
+    DIST_VERSION=14.04
+    MONGODB_VERSION=3.0
+  - >
+    DISTRIBUTION=ubuntu-upstart
+    DIST_VERSION=14.04
+    MONGODB_VERSION=2.6
 #  - >
 #    distribution=ubuntu-upstart
 #    version=12.04
@@ -24,14 +33,14 @@ before_install:
   - sudo apt-get install ansible python-pip -y
   - sudo pip install docker-py==1.5.0
   # Pull docker image
-  - sudo docker pull ${distribution}:${version}
+  - sudo docker pull ${DISTRIBUTION}:${DIST_VERSION}
   - sudo ln -s ${PWD} /etc/ansible/roles/greendayonfire.mongodb
 
 script:
-  - sudo ansible-playbook -i tests/hosts tests/site.yml -e target=mongo1
+  - sudo ansible-playbook -i tests/hosts tests/site.yml -e target=mongo1 -e mongodb_version=${MONGODB_VERSION}
     # Idempotence test
   - >
-    sudo ansible-playbook -i tests/hosts tests/site.yml -e target=mongo1
+    sudo ansible-playbook -i tests/hosts tests/site.yml -e target=mongo1 -e mongodb_version=${MONGODB_VERSION}
     | grep -q 'changed=0.*failed=0'
     && (echo 'Idempotence test: pass' && exit 0)
     || (echo 'Idempotence test: fail' && exit 1)