upgraded PHPUnit to version 4 for better HHVM support

.travis.yml

@@ -21,8 +21,9 @@ before_script:
     - sh -c 'if [ "$TRAVIS_PHP_VERSION" != "hhvm" ] && [ $(php -r "echo PHP_MINOR_VERSION;") -le 4 ]; then echo "extension = apc.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini; fi;'
     - sh -c 'if [ "$TRAVIS_PHP_VERSION" != "hhvm" ]; then echo "extension = memcached.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini; fi;'
     - sh -c 'if [ "$TRAVIS_PHP_VERSION" != "hhvm" ]; then echo "extension = memcache.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini; fi;'
+    - wget https://phar.phpunit.de/phpunit.phar && chmod +x phpunit.phar && sudo mv phpunit.phar /usr/local/bin/phpunit
     - COMPOSER_ROOT_VERSION=dev-master composer --prefer-source --dev install
 
 script:
-    - ls -d src/Symfony/*/* | parallel --gnu --keep-order 'echo "Running {} tests"; phpunit --exclude-group tty,benchmark {};' || exit 1
-    - echo "Running tests requiring tty"; phpunit --group tty
+    - ls -d src/Symfony/*/* | parallel --gnu --keep-order 'echo "Running {} tests"; /usr/local/bin/phpunit --exclude-group tty,benchmark {};' || exit 1
+    - echo "Running tests requiring tty"; /usr/local/bin/phpunit --group tty