Tweak MockClusterTest::testSetBrokerDownAndUp

* ensure broker is down before requesting metadata

Author: dirx

tests/RdKafka/Test/MockClusterTest.php

@@ -269,6 +269,8 @@ public function testSetBrokerDownAndUp(): void
         $producer = new Producer($producerConfig);
 
         $cluster->setBrokerDown(1);
+        sleep(1);
+
         try {
             $producer->getMetadata(false, null, KAFKA_TEST_TIMEOUT_MS);
             $errorCode = 0;