diff --git a/js/tests/unit/alert.js b/js/tests/unit/alert.js
index 5fbb7e5988d3..990905fc3724 100644
--- a/js/tests/unit/alert.js
+++ b/js/tests/unit/alert.js
@@ -1,6 +1,8 @@
 $(function () {
   'use strict'
 
+  window.Alert = typeof bootstrap !== 'undefined' ? bootstrap.Alert : Alert
+
   QUnit.module('alert plugin')
 
   QUnit.test('should be defined on jquery object', function (assert) {
@@ -114,10 +116,6 @@ $(function () {
   QUnit.test('should return alert version', function (assert) {
     assert.expect(1)
 
-    if (typeof Alert !== 'undefined') {
-      assert.strictEqual(typeof Alert.VERSION, 'string')
-    } else {
-      assert.notOk()
-    }
+    assert.strictEqual(typeof Alert.VERSION, 'string')
   })
 })
diff --git a/js/tests/unit/button.js b/js/tests/unit/button.js
index 8dd0cfb3f7ba..cb0d5d70d7dc 100644
--- a/js/tests/unit/button.js
+++ b/js/tests/unit/button.js
@@ -1,6 +1,8 @@
 $(function () {
   'use strict'
 
+  window.Button = typeof bootstrap !== 'undefined' ? bootstrap.Button : Button
+
   QUnit.module('button plugin')
 
   QUnit.test('should be defined on jquery object', function (assert) {
@@ -472,10 +474,6 @@ $(function () {
   QUnit.test('should return button version', function (assert) {
     assert.expect(1)
 
-    if (typeof Button !== 'undefined') {
-      assert.strictEqual(typeof Button.VERSION, 'string')
-    } else {
-      assert.notOk()
-    }
+    assert.strictEqual(typeof Button.VERSION, 'string')
   })
 })
diff --git a/js/tests/unit/toast.js b/js/tests/unit/toast.js
index 4c06be4f4c9b..aa8c490b17f0 100644
--- a/js/tests/unit/toast.js
+++ b/js/tests/unit/toast.js
@@ -1,9 +1,7 @@
 $(function () {
   'use strict'
 
-  if (typeof bootstrap !== 'undefined') {
-    window.Toast = bootstrap.Toast
-  }
+  window.Toast = typeof bootstrap !== 'undefined' ? bootstrap.Toast : Toast
 
   QUnit.module('toast plugin')