Cover changes with jasmine tests, cover case with hide method

Author: Nazar65

app/code/Magento/Ui/view/base/web/js/grid/columns/image-preview.js

@@ -167,7 +167,7 @@ define([
          * Close image preview
          */
         hide: function () {
-            this.lastOpenedImage(null);
+            this.lastOpenedImage(false);
             this.visibleRecord(null);
             this.height(0);
             this._selectRow(null);

dev/tests/js/jasmine/tests/app/code/Magento/Ui/base/js/grid/columns/image-preview.test.js

@@ -51,14 +51,18 @@ define([
             imagePreview.visibleRecord = ko.observable(1);
         });
 
-        describe('show method', function () {
+        describe('verify show && hide record', function () {
+
             it('show image', function () {
-                var mockImg = document.createElement('img'),
-                    hide = spyOn(imagePreview, 'hide');
+                var mockImg = document.createElement('img');
 
+                imagePreview.visibleRecord(2);
                 spyOn($.fn, 'get').and.returnValue(mockImg);
                 imagePreview.show(record);
-                expect(hide).toHaveBeenCalledTimes(1);
+                expect(imagePreview.lastOpenedImage()).toBe(record._rowIndex);
+
+                imagePreview.hide();
+                expect(imagePreview.lastOpenedImage()).toBe(false);
             });
 
         });