move cache test to a separate group

composer.json

@@ -28,6 +28,6 @@
     ]
   },
   "scripts": {
-    "test": "vendor/bin/phpunit"
+    "test": "vendor/bin/phpunit --testsuite unit"
   }
 }

phpunit.xml

@@ -3,8 +3,11 @@
   bootstrap="tests/bootstrap.php"
   beStrictAboutTestsThatDoNotTestAnything="true">
   <testsuites>
-    <testsuite name="comments">
-      <directory suffix="Test.php">tests</directory>
+    <testsuite name="unit">
+      <directory suffix="Test.php">tests/unit</directory>
+    </testsuite>
+    <testsuite name="integration">
+      <directory suffix="Test.php">tests/integration</directory>
     </testsuite>
   </testsuites>
   <filter>