fix: support stdClass in MockServerStreamingCall (#359)

src/Testing/MockServerStreamingCall.php

@@ -36,6 +36,7 @@
 use Google\ApiCore\ApiStatus;
 use Google\Rpc\Code;
 use Google\Rpc\Status;
+use stdClass;
 
 /**
  * The MockServerStreamingCall class is used to mock out the \Grpc\ServerStreamingCall class
@@ -52,14 +53,18 @@ class MockServerStreamingCall extends \Grpc\ServerStreamingCall
      * MockServerStreamingCall constructor.
      * @param mixed[] $responses A list of response objects.
      * @param callable|null $deserialize An optional deserialize method for the response object.
-     * @param MockStatus|null $status An optional status object. If set to null, a status of OK is used.
+     * @param MockStatus|stdClass|null $status An optional status object. If set to null, a status of OK is used.
      */
     public function __construct($responses, $deserialize = null, $status = null)
     {
         $this->responses = $responses;
         $this->deserialize = $deserialize;
         if (is_null($status)) {
             $status = new MockStatus(Code::OK, 'OK', []);
+        } elseif ($status instanceof stdClass) {
+            if (!property_exists($status, 'metadata')) {
+                $status->metadata = [];
+            }
         }
         $this->status = $status;
     }