Let's try the nightly !

Author: Geolim4

.travis.yml

@@ -20,7 +20,7 @@ php:
   - 5.5
   - 5.6
   - 7.0
-  # - nightly
+  - nightly
   # - hhvm We may need to do review this check later
 install:
   - ./bin/ci/install_dependencies.sh

tests/Psr6InterfaceImplements.test.php

@@ -18,7 +18,7 @@
 /**
  * Testing memcached as it is declared in .travis.yml
  */
-$driverInstance = CacheManager::getInstance();
+$driverInstance = CacheManager::getInstance('Memcached');
 
 if (!is_object($driverInstance)) {
     echo '[FAIL] CacheManager::getInstance() returned an invalid variable type:' . gettype($driverInstance) . "\n";