Update HttpTestCase.php (#117)

Author: xiaoguo0426

test/HttpTestCase.php

@@ -15,6 +15,8 @@
 use Hyperf\Testing\Client;
 use PHPUnit\Framework\TestCase;
 
+use function Hyperf\Support\make;
+
 /**
  * Class HttpTestCase.
  * @method get($uri, $data = [], $headers = [])