Move validation to Method class

Author: zoonman

src/Client.php

@@ -483,7 +483,7 @@ public function api($endpoint, array $params = [], $method = Method::GET)
     {
         $headers = $this->getApiHeaders();
         $options = $this->prepareOptions($params, $method);
-        $this->isMethodSupported($method);
+        Method::isMethodSupported($method);
         if ($this->isUsingTokenParam()) {
             $params['oauth2_access_token'] = $this->accessToken->getToken();
         } else {
@@ -545,14 +545,4 @@ protected function prepareOptions(array $params, $method)
         }
         return $options;
     }
-
-    /**
-     * @param $method
-     */
-    private function isMethodSupported($method)
-    {
-        if (!in_array($method, [Method::GET, Method::POST])) {
-            throw new \InvalidArgumentException('The method is not correct');
-        }
-    }
 }

src/Http/Method.php

@@ -66,4 +66,14 @@ class Method extends AbstractEnum
      *
      */
     const TRACE = 'TRACE';
+
+    /**
+     * @param $method
+     */
+    public static function isMethodSupported($method)
+    {
+        if (!in_array($method, [Method::GET, Method::POST])) {
+            throw new \InvalidArgumentException('The method is not correct');
+        }
+    }
 }