Explicitly requiring a newer PHPUnit version for builds

Author: Ocramius

.gitignore

@@ -5,5 +5,6 @@ dist/
 tests/Doctrine/Tests/Common/Proxy/generated/
 vendor/
 .idea
+composer.lock
 doctrine-common-*.tar
 doctrine-common-*.tar.gz

.travis.yml

@@ -10,6 +10,9 @@ php:
 before_script:
   - composer --prefer-source install
 
+script:
+  - ./vendor/bin/phpunit
+
 matrix:
   allow_failures:
      - php: hhvm

composer.json

@@ -20,6 +20,10 @@
         "doctrine/lexer": "1.*",
         "doctrine/annotations": "1.*"
     },
+    "minimum-stability": "dev",
+    "require-dev": {
+        "phpunit/phpunit": "~3.7"
+    },
     "autoload": {
         "psr-0": { "Doctrine\\Common\\": "lib/" }
     },