[Config] Do not skip YamlReferenceDumperTest entirely

Author: ogizanagi

src/Symfony/Component/Config/Tests/Definition/Dumper/YamlReferenceDumperTest.php

@@ -22,8 +22,8 @@ public function testDumper()
 
         $dumper = new YamlReferenceDumper();
 
+        $this->assertContains($this->getConfigurationAsString(), $dumper->dump($configuration));
         $this->markTestIncomplete('The Yaml Dumper currently does not support prototyped arrays');
-        $this->assertEquals($this->getConfigurationAsString(), $dumper->dump($configuration));
     }
 
     private function getConfigurationAsString()
@@ -32,7 +32,7 @@ private function getConfigurationAsString()
 acme_root:
     boolean:              true
     scalar_empty:         ~
-    scalar_null:          ~
+    scalar_null:          null
     scalar_true:          true
     scalar_false:         false
     scalar_default:       default
@@ -59,10 +59,6 @@ enum:                 ~ # One of "this"; "that"
 
         # Prototype
         name:                 ~
-    connections:
-        # Prototype
-        - { user: ~, pass: ~ }
-
 EOL;
     }
 }