Add export of node group templates

Partially-Implements: bp portable-node-group-and-cluster-templates

Depends-On: I7a2ef7e5cff70e6034c1222252fbf7c5c35a7e1c

This change adds functions to saharaclient to enable export of ngt
to JSON.

Change-Id: I33c3b6daa5b9e2be218a84efdb6113a4ce9a86df

saharaclient/api/node_group_templates.py

@@ -127,3 +127,7 @@ class NodeGroupTemplateManager(base.ResourceManager):
     def delete(self, ng_template_id):
         """Delete a Node Group Template."""
         self._delete('/node-group-templates/%s' % ng_template_id)
+
+    def export(self, ng_template_id):
+        """Export a Node Group Template."""
+        return self._get('/node-group-templates/%s/export' % ng_template_id)

saharaclient/tests/unit/base.py

@@ -35,6 +35,11 @@ class BaseTestCase(testtools.TestCase):
         for key, value in body.items():
             self.assertEqual(value, getattr(obj, key))
 
+    def assertDictsEqual(self, dict1, dict2):
+        self.assertEqual(len(dict1), len(dict2))
+        for key in dict1:
+            self.assertEqual(dict1[key], dict2[key])
+
 
 class TestResource(base.Resource):
     resource_name = 'Test Resource'

saharaclient/tests/unit/test_node_group_templates.py

@@ -145,3 +145,12 @@ class NodeGroupTemplateTest(base.BaseTestCase):
         self.assertEqual(update_url, self.responses.last_request.url)
         self.assertEqual(unset_json,
                          json.loads(self.responses.last_request.body))
+
+    def test_node_group_template_export(self):
+        url = self.URL + '/node-group-templates/id/export'
+        self.responses.get(url, json={'node_group_template': self.body})
+        resp = self.client.node_group_templates.export('id')
+
+        self.assertEqual(url, self.responses.last_request.url)
+        self.assertIsInstance(resp, ng.NodeGroupTemplate)
+        self.assertDictsEqual(self.body, resp.__dict__[u'node_group_template'])