skip a transient test on Windows

Author: xabbuh

Tests/Server/ConnectionTest.php

@@ -24,6 +24,10 @@ class ConnectionTest extends TestCase
 
     public function testDump()
     {
+        if ('True' === getenv('APPVEYOR')) {
+            $this->markTestSkipped('Skip transient test on AppVeyor');
+        }
+
         $cloner = new VarCloner();
         $data = $cloner->cloneVar('foo');
         $connection = new Connection(self::VAR_DUMPER_SERVER, [