public function testStartProcessInstance()
 {
     $restClient = new camundaRestClient(self::$restApi);
     $countPreStart = $restClient->getProcessInstanceCount()->count;
     foreach ($restClient->getProcessDefinitions() as $data) {
         if ($data->key == 'invoice') {
             $restClient->startProcessInstance($data->id);
         }
     }
     $this->assertGreaterThan($countPreStart, $restClient->getProcessInstanceCount()->count);
 }