diff --git a/ember-cli-build.js b/ember-cli-build.js
index e5f72809c..8012b37da 100644
--- a/ember-cli-build.js
+++ b/ember-cli-build.js
@@ -9,7 +9,7 @@ module.exports = function (defaults) {
       testGenerator: 'qunit',
     },
     trees: {
-      vendor: null,
+      vendor: 'tests/dummy/vendor',
     },
   };
 
diff --git a/tests/dummy/vendor/ember-cli/test-support-suffix.js b/tests/dummy/vendor/ember-cli/test-support-suffix.js
new file mode 100644
index 000000000..0b3c6676d
--- /dev/null
+++ b/tests/dummy/vendor/ember-cli/test-support-suffix.js
@@ -0,0 +1,15 @@
+/** globals runningTests */
+/*
+  used to determine if the application should be booted immediately when `app-name.js` is evaluated
+  when `runningTests` the `app-name.js` file will **not** import the applications `app/app.js` and
+  call `Application.create(...)` on it. Additionally, applications can opt-out of this behavior by
+  setting `autoRun` to `false` in their `ember-cli-build.js`
+*/
+runningTests = true;
+
+/*
+  This file overrides a file built into ember-cli's build pipeline and prevents
+  this built-in `Testem.hookIntoTestFramework` invocation:
+
+  https://github.com/ember-cli/ember-cli/blob/v3.20.0/lib/broccoli/test-support-suffix.js#L3-L5
+*/
diff --git a/tests/test-helper.js b/tests/test-helper.js
index 05f20f156..82362e937 100644
--- a/tests/test-helper.js
+++ b/tests/test-helper.js
@@ -1,3 +1,4 @@
+/* globals Testem */
 import QUnit from 'qunit';
 import { registerDeprecationHandler } from '@ember/debug';
 import AbstractTestLoader from 'ember-cli-test-loader/test-support/index';
@@ -125,3 +126,7 @@ QUnit.assert.deprecationsInclude = function (expected) {
 };
 
 QUnit.start();
+
+if (typeof Testem !== 'undefined') {
+  Testem.hookIntoTestFramework();
+}