fix(decision_service): Return null variation if experiment key does not exist in feature's experimentIds array. (#206)

(cherry picked from commit cfea9ce)

Author: mfahadahmed

packages/optimizely-sdk/lib/core/decision_service/index.js

@@ -1,5 +1,5 @@
 /****************************************************************************
- * Copyright 2017-2018, Optimizely, Inc. and contributors                   *
+ * Copyright 2017-2019, Optimizely, Inc. and contributors                   *
  *                                                                          *
  * Licensed under the Apache License, Version 2.0 (the "License");          *
  * you may not use this file except in compliance with the License.         *
@@ -314,7 +314,7 @@ DecisionService.prototype._getVariationForFeatureExperiment = function(feature,
     var group = this.configObj.groupIdMap[feature.groupId];
     if (group) {
       experiment = this._getExperimentInGroup(group, userId);
-      if (experiment) {
+      if (experiment && feature.experimentIds.indexOf(experiment.id) !== -1) {
         variationKey = this.getVariation(experiment.key, userId, attributes);
       }
     }

packages/optimizely-sdk/lib/core/decision_service/index.tests.js

@@ -1,5 +1,5 @@
 /****************************************************************************
- * Copyright 2017-2018, Optimizely, Inc. and contributors                        *
+ * Copyright 2017-2019, Optimizely, Inc. and contributors                        *
  *                                                                          *
  * Licensed under the Apache License, Version 2.0 (the "License");          *
  * you may not use this file except in compliance with the License.         *
@@ -888,6 +888,18 @@ describe('lib/core/decision_service', function() {
             assert.deepEqual(decision, expectedDecision);
             sinon.assert.calledWithExactly(mockLogger.log, LOG_LEVEL.DEBUG, 'DECISION_SERVICE: User user1 is not in any experiment on the feature feature_with_group.');
           });
+
+          it('returns null decision for group experiment not referenced by the feature', function() {
+            var noTrafficExpFeature = configObj.featureKeyMap.feature_exp_no_traffic;
+            var decision = decisionServiceInstance.getVariationForFeature(noTrafficExpFeature, 'user1');
+            var expectedDecision = {
+              experiment: null,
+              variation: null,
+              decisionSource: null,
+            };
+            assert.deepEqual(decision, expectedDecision);
+            sinon.assert.calledWithExactly(mockLogger.log, LOG_LEVEL.DEBUG, 'DECISION_SERVICE: User user1 is not in any experiment on the feature feature_exp_no_traffic.');
+          });
         });
 
         describe('user not bucketed into the group', function() {

packages/optimizely-sdk/lib/optimizely/index.tests.js

@@ -1,5 +1,5 @@
 /****************************************************************************
- * Copyright 2016-2018, Optimizely, Inc. and contributors                   *
+ * Copyright 2016-2019, Optimizely, Inc. and contributors                   *
  *                                                                          *
  * Licensed under the Apache License, Version 2.0 (the "License");          *
  * you may not use this file except in compliance with the License.         *
@@ -2955,7 +2955,7 @@ describe('lib/optimizely', function() {
         assert.strictEqual(result.length, 2);
         assert.isAbove(result.indexOf('test_feature'), -1);
         assert.isAbove(result.indexOf('test_feature_for_experiment'), -1);
-        sinon.assert.callCount(optlyInstance.isFeatureEnabled, 6);
+        sinon.assert.callCount(optlyInstance.isFeatureEnabled, 7);
         sinon.assert.calledWithExactly(
           optlyInstance.isFeatureEnabled,
           'test_feature',
@@ -2992,6 +2992,12 @@ describe('lib/optimizely', function() {
           'user1',
           attributes
         );
+        sinon.assert.calledWithExactly(
+          optlyInstance.isFeatureEnabled,
+          'feature_exp_no_traffic',
+          'user1',
+          attributes
+        );
       });
     });
 

packages/optimizely-sdk/lib/tests/test_data.js

@@ -1,5 +1,5 @@
 /**
- * Copyright 2016-2018, Optimizely
+ * Copyright 2016-2019, Optimizely
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -417,6 +417,15 @@ var configWithFeatures = {
       'id': '599110',
       'experimentIds': [],
       'variables': []
+    },
+    {
+      'rolloutId': '',
+      'key': 'feature_exp_no_traffic',
+      'id': '4482920079',
+      'experimentIds': [
+        '12115595439'
+      ],
+      'variables': []
     }
   ],
   'experiments': [
@@ -625,6 +634,74 @@ var configWithFeatures = {
           'entityId': '599082'
         }
       ]
+    },
+    {
+      'policy': 'random',
+      'id': '595025',
+      'experiments': [
+        {
+          'trafficAllocation': [
+            {
+              'endOfRange': 10000,
+              'entityId': '12098126627'
+            }
+          ],
+          'layerId': '595005',
+          'forcedVariations': {},
+          'audienceIds': [],
+          'variations': [
+            {
+              'key': 'all_traffic_variation',
+              'id': '12098126627',
+              'variables': []
+            },
+            {
+              'key': 'no_traffic_variation',
+              'id': '12098126628',
+              'variables': []
+            }
+          ],
+          'status': 'Running',
+          'key': 'all_traffic_experiment',
+          'id': '12198292375'
+        },
+        {
+          'trafficAllocation': [
+            {
+              'endOfRange': 5000,
+              'entityId': '12098126629'
+            },
+            {
+              'endOfRange': 10000,
+              'entityId': '12098126630'
+            }
+          ],
+          'layerId': '12187694826',
+          'forcedVariations': {},
+          'audienceIds': [],
+          'variations': [
+            {
+              'key': 'variation_5000',
+              'id': '12098126629',
+              'variables': []
+            },
+            {
+              'key': 'variation_10000',
+              'id': '12098126630',
+              'variables': []
+            }
+          ],
+          'status': 'Running',
+          'key': 'no_traffic_experiment',
+          'id': '12115595439'
+        }
+      ],
+      'trafficAllocation': [
+        {
+          'endOfRange': 10000,
+          'entityId': '12198292375'
+        }
+      ]
     }
   ],
   'attributes': [
@@ -1321,6 +1398,10 @@ var datafileWithFeaturesExpectedData = {
     },
     599080: {},
     599081: {},
+    12098126627: {},
+    12098126628: {},
+    12098126629: {},
+    12098126630: {},
   },
 
   featureKeyMap: {
@@ -1535,6 +1616,15 @@ var datafileWithFeaturesExpectedData = {
       'variables': [],
       variableKeyMap: {},
     },
+    feature_exp_no_traffic: {
+      'rolloutId': '',
+      'key': 'feature_exp_no_traffic',
+      'id': '4482920079',
+      'experimentIds': ['12115595439'],
+      'variables': [],
+      variableKeyMap: {},
+      groupId: '595025',
+    },
   },
 };