diff --git a/tests/dummy/app/app.js b/tests/dummy/app/app.js
index 831ad6106dd..394ec74d45e 100644
--- a/tests/dummy/app/app.js
+++ b/tests/dummy/app/app.js
@@ -2,10 +2,13 @@ import Ember from 'ember';
 import Resolver from './resolver';
 import loadInitializers from 'ember-load-initializers';
 import config from './config/environment';
+import {
+  setup as setupModelFactoryInjections
+} from 'dummy/tests/helpers/model-factory-injection';
 
 let App;
 
-Ember.MODEL_FACTORY_INJECTIONS = true;
+setupModelFactoryInjections();
 
 App = Ember.Application.extend({
   modulePrefix: config.modulePrefix,
diff --git a/tests/helpers/model-factory-injection.js b/tests/helpers/model-factory-injection.js
new file mode 100644
index 00000000000..aad65f95ade
--- /dev/null
+++ b/tests/helpers/model-factory-injection.js
@@ -0,0 +1,14 @@
+import Ember from 'ember';
+import hasEmberVersion from 'ember-test-helpers/has-ember-version';
+
+let ORIGINAL_MODEL_FACTORY_INJECTIONS = Ember.MODEL_FACTORY_INJECTIONS;
+
+export function setup(value = true) {
+  if (!hasEmberVersion(2, 14)) {
+    Ember.MODEL_FACTORY_INJECTIONS = value;
+  }
+}
+
+export function reset() {
+  setup(ORIGINAL_MODEL_FACTORY_INJECTIONS);
+}
diff --git a/tests/integration/injection-test.js b/tests/integration/injection-test.js
index c24c4bdacbe..dfbc603ff05 100644
--- a/tests/integration/injection-test.js
+++ b/tests/integration/injection-test.js
@@ -1,10 +1,13 @@
+import {
+  setup as setupModelFactoryInjections,
+  reset as resetModelFactoryInjections
+} from 'dummy/tests/helpers/model-factory-injection';
 import setupStore from 'dummy/tests/helpers/store';
 import Ember from 'ember';
 import DS from 'ember-data';
 import { module, test } from 'qunit';
 
 let env, hasFactoryFor, originalLookupFactory, originalOwnerLookupFactory, originalFactoryFor;
-let originalMODEL_FACTORY_INJECTIONS = Ember.MODEL_FACTORY_INJECTIONS;
 const { run } = Ember;
 
 const model = {
@@ -79,7 +82,7 @@ test('modelFor', function(assert) {
 
 module('integration/injection eager injections', {
   setup() {
-    Ember.MODEL_FACTORY_INJECTIONS = true;
+    setupModelFactoryInjections();
     env = setupStore();
 
     env.registry.injection('model:foo', 'apple', 'service:apple');
@@ -90,7 +93,7 @@ module('integration/injection eager injections', {
 
   teardown() {
     // can be removed once we no longer support ember versions without lookupFactory
-    Ember.MODEL_FACTORY_INJECTIONS = originalMODEL_FACTORY_INJECTIONS;
+    resetModelFactoryInjections();
 
     run(env.store, 'destroy');
   }
diff --git a/tests/integration/relationships/belongs-to-test.js b/tests/integration/relationships/belongs-to-test.js
index 88fa6b08f0e..1836ace5c9d 100644
--- a/tests/integration/relationships/belongs-to-test.js
+++ b/tests/integration/relationships/belongs-to-test.js
@@ -1,3 +1,7 @@
+import {
+  setup as setupModelFactoryInjections,
+  reset as resetModelFactoryInjections
+} from 'dummy/tests/helpers/model-factory-injection';
 import setupStore from 'dummy/tests/helpers/store';
 import Ember from 'ember';
 
@@ -11,10 +15,11 @@ const { attr, hasMany, belongsTo } = DS;
 const { hash } = RSVP;
 
 let env, store, User, Message, Post, Comment, Book, Chapter, Author, NewMessage;
-const injectionValue = Ember.MODEL_FACTORY_INJECTIONS;
 
 module("integration/relationship/belongs_to Belongs-To Relationships", {
   beforeEach() {
+    setupModelFactoryInjections();
+
     User = DS.Model.extend({
       name: attr('string'),
       messages: hasMany('message', { polymorphic: true, async: false }),
@@ -83,7 +88,7 @@ module("integration/relationship/belongs_to Belongs-To Relationships", {
   },
 
   afterEach() {
-    Ember.MODEL_FACTORY_INJECTIONS = injectionValue;
+    resetModelFactoryInjections();
     run(env.container, 'destroy');
   }
 });
diff --git a/tests/integration/relationships/has-many-test.js b/tests/integration/relationships/has-many-test.js
index e359df81d27..0db8908dd08 100644
--- a/tests/integration/relationships/has-many-test.js
+++ b/tests/integration/relationships/has-many-test.js
@@ -1,5 +1,9 @@
 /*eslint no-unused-vars: ["error", { "args": "none", "varsIgnorePattern": "(page)" }]*/
 
+import {
+  setup as setupModelFactoryInjections,
+  reset as resetModelFactoryInjections
+} from 'dummy/tests/helpers/model-factory-injection';
 import setupStore from 'dummy/tests/helpers/store';
 import Ember from 'ember';
 
@@ -1338,8 +1342,7 @@ test("When a polymorphic hasMany relationship is accessed, the store can call mu
 test("polymorphic hasMany type-checks check the superclass when MODEL_FACTORY_INJECTIONS is enabled", function(assert) {
   assert.expect(1);
 
-  let injectionValue = Ember.MODEL_FACTORY_INJECTIONS;
-  Ember.MODEL_FACTORY_INJECTIONS = true;
+  setupModelFactoryInjections();
 
   try {
     run(function () {
@@ -1351,7 +1354,7 @@ test("polymorphic hasMany type-checks check the superclass when MODEL_FACTORY_IN
       assert.equal(igor.get('messages.firstObject.body'), "Well I thought the title was fine");
     });
   } finally {
-    Ember.MODEL_FACTORY_INJECTIONS = injectionValue;
+    resetModelFactoryInjections();
   }
 });
 
diff --git a/tests/integration/relationships/polymorphic-mixins-belongs-to-test.js b/tests/integration/relationships/polymorphic-mixins-belongs-to-test.js
index 9439b60d168..f62f41e22d1 100644
--- a/tests/integration/relationships/polymorphic-mixins-belongs-to-test.js
+++ b/tests/integration/relationships/polymorphic-mixins-belongs-to-test.js
@@ -1,3 +1,8 @@
+import {
+  setup as setupModelFactoryInjections,
+  reset as resetModelFactoryInjections
+} from 'dummy/tests/helpers/model-factory-injection';
+
 import setupStore from 'dummy/tests/helpers/store';
 import Ember from 'ember';
 
@@ -155,8 +160,7 @@ testInDebug("Setting the polymorphic belongsTo with an object that does not impl
 
 test("Setting the polymorphic belongsTo gets propagated to the inverse side - model injections true", function(assert) {
   assert.expect(2);
-  var injectionValue = Ember.MODEL_FACTORY_INJECTIONS;
-  Ember.MODEL_FACTORY_INJECTIONS = true;
+  setupModelFactoryInjections();
 
   try {
     var user, video;
@@ -190,13 +194,12 @@ test("Setting the polymorphic belongsTo gets propagated to the inverse side - mo
       });
     });
   } finally {
-    Ember.MODEL_FACTORY_INJECTIONS = injectionValue;
+    resetModelFactoryInjections();
   }
 });
 
 testInDebug("Setting the polymorphic belongsTo with an object that does not implement the mixin errors out - model injections true", function(assert) {
-  var injectionValue = Ember.MODEL_FACTORY_INJECTIONS;
-  Ember.MODEL_FACTORY_INJECTIONS = true;
+  setupModelFactoryInjections();
 
   try {
     var user, video;
@@ -226,6 +229,6 @@ testInDebug("Setting the polymorphic belongsTo with an object that does not impl
       }, /You cannot add a record of modelClass 'not-message' to the 'user.bestMessage' relationship \(only 'message' allowed\)/);
     });
   } finally {
-    Ember.MODEL_FACTORY_INJECTIONS = injectionValue;
+    resetModelFactoryInjections();
   }
 });
diff --git a/tests/integration/relationships/polymorphic-mixins-has-many-test.js b/tests/integration/relationships/polymorphic-mixins-has-many-test.js
index 9141b088522..8993ad3f8c4 100644
--- a/tests/integration/relationships/polymorphic-mixins-has-many-test.js
+++ b/tests/integration/relationships/polymorphic-mixins-has-many-test.js
@@ -1,3 +1,8 @@
+import {
+  setup as setupModelFactoryInjections,
+  reset as resetModelFactoryInjections
+} from 'dummy/tests/helpers/model-factory-injection';
+
 import setupStore from 'dummy/tests/helpers/store';
 import Ember from 'ember';
 
@@ -170,8 +175,7 @@ testInDebug("Pushing a an object that does not implement the mixin to the mixin
 });
 
 test("Pushing to the hasMany reflects the change on the belongsTo side - model injections true", function(assert) {
-  var injectionValue = Ember.MODEL_FACTORY_INJECTIONS;
-  Ember.MODEL_FACTORY_INJECTIONS = true;
+  setupModelFactoryInjections();
 
   try {
     var user, video;
@@ -209,7 +213,7 @@ test("Pushing to the hasMany reflects the change on the belongsTo side - model i
       });
     });
   } finally {
-    Ember.MODEL_FACTORY_INJECTIONS = injectionValue;
+    resetModelFactoryInjections();
   }
 });
 
@@ -217,8 +221,7 @@ test("Pushing to the hasMany reflects the change on the belongsTo side - model i
   Local edits
 */
 testInDebug("Pushing a an object that does not implement the mixin to the mixin accepting array errors out - model injections true", function(assert) {
-  var injectionValue = Ember.MODEL_FACTORY_INJECTIONS;
-  Ember.MODEL_FACTORY_INJECTIONS = true;
+  setupModelFactoryInjections();
 
   try {
     var user,notMessage;
@@ -255,7 +258,6 @@ testInDebug("Pushing a an object that does not implement the mixin to the mixin
       });
     });
   } finally {
-    Ember.MODEL_FACTORY_INJECTIONS = injectionValue;
+    resetModelFactoryInjections();
   }
 });
-