add delete flavor test case for trio2o

1. what is the problem?

   flavors case  has not finished

2. What is the solution to the problem?

   complete the test finished create  all flavors

3. What the features to be implemented in the Trio2o to realize the solution?

   Signed-off-by: zhangchi <zhangchi@szzt.com.cn>
   co-Authored-By: tangzhuo <ztang@hnu.edu.cn>

Change-Id: I16873ecd4002abdaf214b29c6bec199e7958b443

trio2o/nova_apigw/controllers/flavor.py

@@ -214,4 +214,4 @@ class FlavorController(rest.RestController):
         except Exception:
             return utils.format_nova_error(500, _('Failed to delete flavor'))
         pecan.response.status = 202
-        return
+        return pecan.response

trio2o/tests/unit/nova_apigw/controllers/test_flavor.py

@@ -14,6 +14,7 @@
 #    under the License.
 
 from mock import patch
+import pecan
 import unittest
 
 from trio2o.common import context
@@ -21,6 +22,10 @@ from trio2o.db import core
 from trio2o.nova_apigw.controllers import flavor
 
 
+class FakeResponse(object):
+    pass
+
+
 class FlavorTest(unittest.TestCase):
     def setUp(self):
         core.initialize()
@@ -29,6 +34,7 @@ class FlavorTest(unittest.TestCase):
         self.project_id = 'test_project'
         self.controller = flavor.FlavorController(self.project_id)
 
+    @patch.object(pecan, 'response', new=FakeResponse)
     @patch.object(context, 'extract_context_from_environ')
     def test_post(self, mock_context):
         mock_context.return_value = self.context
@@ -42,6 +48,8 @@ class FlavorTest(unittest.TestCase):
         self.assertEqual(1024, flavor_dict['memory_mb'])
         self.assertEqual(1, flavor_dict['vcpus'])
         self.assertEqual(10, flavor_dict['root_gb'])
+        res = self.controller.delete('1')
+        self.assertEqual(202, res.status)
 
     def tearDown(self):
         core.ModelBase.metadata.drop_all(core.get_engine())