Adds resize option to linode Instance objects

Includes test.

Author: Adam Heinz

linode_api4/objects/linode.py

@@ -348,6 +348,13 @@ def reboot(self):
             return False
         return True
 
+    def resize(self, new_type):
+        resp = self._client.post("{}/resize".format(Instance.api_endpoint), model=self, data={"type": new_type})
+
+        if 'error' in resp:
+            return False
+        return True
+
     @staticmethod
     def generate_root_password():
         def _func(value):

test/objects/linode_test.py

@@ -160,6 +160,18 @@ def test_boot(self):
             linode.boot()
             self.assertEqual(m.call_url, '/linode/instances/123/boot')
 
+    def test_resize(self):
+        """
+        Tests that you can submit a correct resize api request
+        """
+        linode = Instance(self.client, 123)
+        result = {}
+
+        with self.mock_post(result) as m:
+            linode.resize(new_type='g6-standard-1')
+            self.assertEqual(m.call_url, '/linode/instances/123/resize')
+            self.assertEqual(m.call_data, {'type': 'g6-standard-1'})
+
     def test_boot_with_config(self):
         """
         Tests that you can submit a correct boot with a config api request