sort enabled feature keys (#104)

* 🖊️ sort enabled feature keys response

* 🖊️ Dictionary values are called in different orders in python versions

optimizely/optimizely.py

@@ -421,7 +421,7 @@ def get_enabled_features(self, user_id, attributes=None):
       attributes: Dict representing user attributes.
 
     Returns:
-      A list of the keys of the features that are enabled for the user.
+      A sorted list of the keys of the features that are enabled for the user.
     """
 
     enabled_features = []
@@ -433,6 +433,7 @@ def get_enabled_features(self, user_id, attributes=None):
       if self.is_feature_enabled(feature.key, user_id, attributes):
         enabled_features.append(feature.key)
 
+    enabled_features.sort()
     return enabled_features
 
   def get_feature_variable_boolean(self, feature_key, variable_key, user_id, attributes=None):

tests/test_optimizely.py

@@ -1438,6 +1438,29 @@ def side_effect(*args, **kwargs):
     mock_is_feature_enabled.assert_any_call('test_feature_in_group', 'user_1', None)
     mock_is_feature_enabled.assert_any_call('test_feature_in_experiment_and_rollout', 'user_1', None)
 
+  def test_get_enabled_features_returns_a_sorted_list(self):
+    """ Test that get_enabled_features returns a sorted list of enabled feature keys. """
+
+    opt_obj = optimizely.Optimizely(json.dumps(self.config_dict_with_features))
+
+    with mock.patch('optimizely.optimizely.Optimizely.is_feature_enabled',
+                    return_value=True) as mock_is_feature_enabled:
+      received_features = opt_obj.get_enabled_features('user_1')
+
+    mock_is_feature_enabled.assert_any_call('test_feature_in_experiment', 'user_1', None)
+    mock_is_feature_enabled.assert_any_call('test_feature_in_rollout', 'user_1', None)
+    mock_is_feature_enabled.assert_any_call('test_feature_in_group', 'user_1', None)
+    mock_is_feature_enabled.assert_any_call('test_feature_in_experiment_and_rollout', 'user_1', None)
+
+    expected_sorted_features = [
+      'test_feature_in_experiment',
+      'test_feature_in_experiment_and_rollout',
+      'test_feature_in_group',
+      'test_feature_in_rollout'
+      ]
+
+    self.assertEqual(expected_sorted_features, received_features)
+
   def test_get_enabled_features__invalid_object(self):
     """ Test that get_enabled_features returns empty list if Optimizely object is not valid. """