test(request): add unit test for isPost method

Author: jturbide

tests/Unit/Http/RequestTest.php

@@ -73,6 +73,7 @@ public function testToArray(): void
             'isConnect' => false,
             'isTrace' => false,
             'isPut' => false,
+            'isPost' => false,
             'isPurge' => false,
             'isOptions' => false,
             'isSoap' => false,