Test assertStatus() on GZIP-encoded JSON

Avoid exception "Invalid JSON was returned from the route"
when the TestResponse class is unable to discover the
JSON response body 'errors' key.

tests/Testing/TestResponseTest.php

@@ -607,6 +607,18 @@ public function testAssertStatusWhenJsonIsFalse()
         $response->assertStatus(200);
     }
 
+    public function testAssertStatusWhenJsonIsEncoded()
+    {
+        $baseResponse = tap(new Response, function ($response) {
+            $response->header('Content-Type', 'application/json');
+            $response->header('Content-Encoding', 'gzip');
+            $response->setContent('b"x£½V*.I,)-V▓R╩¤V¬\x05\x00+ü\x059"');
+        });
+
+        $response = TestResponse::fromBaseResponse($baseResponse);
+        $response->assertStatus(200);
+    }
+
     public function testAssertHeader()
     {
         $this->expectException(AssertionFailedError::class);