PHPLIB-98: Add multiple server versions to Travis CI

.travis.yml

@@ -7,12 +7,27 @@ php:
   - 5.6
 
 env:
-  - MONGODB_VERSION=alpha
+  global:
+    - KEY_SERVER="hkp://keyserver.ubuntu.com:80"
+    - MONGO_REPO_URI="http://repo.mongodb.com/apt/ubuntu"
+    - MONGO_REPO_TYPE="precise/mongodb-enterprise/"
+    - SOURCES_LOC="/etc/apt/sources.list.d/mongodb.list"
+  matrix:
+    - DRIVER_VERSION=alpha SERVER_VERSION=2.4
+    - DRIVER_VERSION=alpha SERVER_VERSION=2.6
+    - DRIVER_VERSION=alpha SERVER_VERSION=3.0
 
-services: mongodb
+before_install:
+  - sudo apt-key adv --keyserver ${KEY_SERVER} --recv 7F0CEB10
+  - echo "deb ${MONGO_REPO_URI} ${MONGO_REPO_TYPE}${SERVER_VERSION} multiverse" | sudo tee ${SOURCES_LOC}
+  - sudo apt-get update -qq
+
+install:
+  - if dpkg --compare-versions ${SERVER_VERSION} le "2.4"; then export SERVER_PACKAGE=mongodb-10gen-enterprise; else export SERVER_PACKAGE=mongodb-enterprise; fi
+  - sudo apt-get install ${SERVER_PACKAGE}
 
 before_script:
-  - mongo --eval 'tojson(db.runCommand({buildInfo:1}))'
-  - pecl install -f mongodb-${MONGODB_VERSION}
+  - mongod --version
+  - pecl install -f mongodb-${DRIVER_VERSION}
   - php --ri mongodb
   - composer install --dev --no-interaction --prefer-source