Resolve "Testcenter Instanzen parallel anfragen"

#49

src/TestcenterConnector.php

@@ -684,15 +684,6 @@ class TestcenterConnector
             });
     }
 
-    /**
-     * @return bool
-     * @throws TestcenterConnectorException
-     */
-    private function hasRunningSession(): bool
-    {
-        return $this->hasRunningSessionAsync()->wait();
-    }
-
     private function hasRunningSessionAsync(): PromiseInterface
     {
         if ($this->authToken === null || $this->user->getUsername() !== $this->authenticatedUsername) {