Skip some tests under HHVM.

Author: mekras

tests/CurlHttpAsyncClientTestCase.php

@@ -51,4 +51,12 @@ public function testSendAsyncRequestWithOutcome(
             $body
         );
     }
+
+    public function testSuccessiveCallMustUseResponseInterface()
+    {
+        if (defined('HHVM_VERSION')) {
+            static::markTestSkipped('This test can not run under HHVM');
+        }
+        parent::testSuccessiveCallMustUseResponseInterface();
+    }
 }