ACP2E-956: [Magento Cloud] Drag & Drop Multiple Files Into The Gallery Not Working

 - Added the test coverage.

Author: devarul

dev/tests/js/jasmine/tests/app/code/Magento/Backend/view/adminhtml/web/js/media-uploader.test.js

@@ -0,0 +1,50 @@
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+/*eslint max-nested-callbacks: 0*/
+
+define([
+    'jquery',
+    'squire'
+], function ($, Squire) {
+    'use strict';
+
+    describe('Magento_Backend/js/media-uploader', function () {
+        let injector = new Squire(),
+            mediaUploaderComponent;
+
+        beforeEach(function (done) {
+            injector.require([
+                'Magento_Backend/js/media-uploader',
+                'knockoutjs/knockout-es5'
+            ], function (mediaUploader) {
+                mediaUploaderComponent = new mediaUploader({});
+                done();
+            });
+        });
+
+        afterEach(function () {
+            try {
+                injector.clean();
+                injector.remove();
+            } catch (e) {
+            }
+        });
+
+        describe('_create() method', function () {
+            it('_create method to be trigger and check the dropzone attribute key and value', function () {
+                spyOn(jQuery.fn, 'fileupload');
+                mediaUploaderComponent._create();
+                expect(jQuery.fn.fileupload).toHaveBeenCalledWith(
+                    jasmine.objectContaining({
+                        dropZone: mediaUploaderComponent.
+                                    element.find('input[type=file]')
+                                    .closest('[role="dialog"]')
+                    }
+                ));
+            });
+        });
+    });
+});