Add test to check for the absence of volumes_from

tests/test.py

@@ -341,6 +341,15 @@ class DockerClientTest(unittest.TestCase):
                          ','.join(vol_names))
         self.assertEqual(args[1]['headers'],
                          {'Content-Type': 'application/json'})
+    def test_create_container_empty_volumes_from(self):
+        try:
+            self.client.create_container('busybox', 'true', volumes_from=[])
+        except Exception as e:
+            self.fail('Command should not raise exception: {0}'.format(e))
+
+        args = fake_request.call_args
+        data = json.loads(args[1]['data'])
+        self.assertTrue('VolumesFrom' not in data)
 
     def test_create_named_container(self):
         try: