diff --git a/packages/devextreme/testing/helpers/calendarFixtures.js b/packages/devextreme/testing/helpers/calendarFixtures.js
index 905ee592c731..efef5de6387a 100644
--- a/packages/devextreme/testing/helpers/calendarFixtures.js
+++ b/packages/devextreme/testing/helpers/calendarFixtures.js
@@ -1,91 +1,88 @@
 import $ from 'jquery';
-import { noop } from 'core/utils/common';
-import Class from 'core/class';
-import Views from '__internal/ui/calendar/calendar.views';
 
 const TEXTEDITOR_INPUT_SELECTOR = '.dx-texteditor-input';
 
 window.DevExpress = window.DevExpress || {};
+DevExpress.ui = DevExpress.ui || {};
+DevExpress.ui.testing = DevExpress.ui.testing || {};
 
-$.extend(true, DevExpress.ui = DevExpress.ui || {}, {
-    testing: {
-        BaseCalendarFixture: Class.inherit({
-            extractArray: function(elements, delegate) {
-                return $.map($.makeArray(elements), delegate);
-            },
-            extractInnerHTMLArray: function(elements) {
-                return this.extractArray(elements, function(element, index) {
-                    return element.innerHTML;
-                });
-            },
-            extractInnerTextArray: function(elements) {
-                return this.extractArray(elements, function(element, index) {
-                    return $(element).text();
-                });
-            },
-            extractClassArray: function(elements) {
-                return this.extractArray(elements, function(element, index) {
-                    return element.getAttribute('class') || '';
-                });
-            },
-            typeIntoInput: function(dateString, input) {
-                const keyPress = $.Event('keypress');
-                let i;
-                for(i = 0; i < dateString.length; ++i) {
-                    keyPress.key = dateString[i];
-                    input.val(input.val() + dateString[i]);
-                    input.trigger(keyPress);
-                }
-            }
-        }),
-        MockMonthView: Views['month'].inherit({
-            renderHeader: noop,
-            renderBody: noop
-        })
+class BaseCalendarFixture {
+    extractArray(elements, delegate) {
+        return $.map($.makeArray(elements), delegate);
     }
-});
 
-$.extend(true, DevExpress.ui, {
-    testing: {
-        CalendarFixture: DevExpress.ui.testing.BaseCalendarFixture.inherit({
-            ctor: function(options) {
-                this.rootElement = $('<div id=\'calendar\'></div>');
-                this.rootElement.appendTo('body');
-                this.calendar = $('#calendar')
-                    .dxCalendar($.extend({ monthViewType: DevExpress.ui.testing.MockMonthView }, options))
-                    .dxCalendar('instance');
-                this.navigatorLinks = {
-                    'prevYear': this.rootElement.find('.dx-calendar-navigator-previous-year'),
-                    'prevView': this.rootElement.find('.dx-calendar-navigator-previous-view'),
-                    'nextYear': this.rootElement.find('.dx-calendar-navigator-next-year'),
-                    'nextView': this.rootElement.find('.dx-calendar-navigator-next-view')
-                };
-            },
-            dispose: function() {
-                this.rootElement.remove();
-                this.calendar = null;
-            }
-        }),
+    extractInnerHTMLArray(elements) {
+        return this.extractArray(elements, function(element) {
+            return element.innerHTML;
+        });
+    }
+
+    extractInnerTextArray(elements) {
+        return this.extractArray(elements, function(element) {
+            return $(element).text();
+        });
+    }
+
+    extractClassArray(elements) {
+        return this.extractArray(elements, function(element) {
+            return element.getAttribute('class') || '';
+        });
+    }
+
+    typeIntoInput(dateString, input) {
+        const keyPress = $.Event('keypress');
+        for(let i = 0; i < dateString.length; ++i) {
+            keyPress.key = dateString[i];
+            input.val(input.val() + dateString[i]);
+            input.trigger(keyPress);
+        }
+    }
+}
 
-        DateBoxFixture: DevExpress.ui.testing.BaseCalendarFixture.inherit({
-            ctor: function(element, options) {
-                this.format = 'shortdate';
-                this.rootElement = $(element);
+class CalendarFixture extends BaseCalendarFixture {
+    constructor(options) {
+        super();
+        this.rootElement = $('<div id=\'calendar\'></div>');
+        this.rootElement.appendTo('body');
+        this.calendar = $('#calendar')
+            .dxCalendar(options)
+            .dxCalendar('instance');
+        this.navigatorLinks = {
+            'prevYear': this.rootElement.find('.dx-calendar-navigator-previous-year'),
+            'prevView': this.rootElement.find('.dx-calendar-navigator-previous-view'),
+            'nextYear': this.rootElement.find('.dx-calendar-navigator-next-year'),
+            'nextView': this.rootElement.find('.dx-calendar-navigator-next-view')
+        };
+    }
+
+    dispose() {
+        this.rootElement.remove();
+        this.calendar = null;
+    }
+}
+
+class DateBoxFixture extends BaseCalendarFixture {
+    constructor(element, options) {
+        super();
+        this.format = 'shortdate';
+        this.rootElement = $(element);
 
-                this.dateBox = this.rootElement
-                    .dxDateBox($.extend(true, {
-                        pickerType: 'calendar',
-                        displayFormat: this.format,
-                        calendarOptions: { monthViewType: DevExpress.ui.testing.MockMonthView }
-                    }, options))
-                    .dxDateBox('instance');
-                this.input = this.rootElement.find(TEXTEDITOR_INPUT_SELECTOR);
-            },
-            dispose: function() {
-                this.rootElement.empty();
-                $.cleanData(this.rootElement);
-                this.dateBox = null;
-            }
-        })
+        this.dateBox = this.rootElement
+            .dxDateBox($.extend(true, {
+                pickerType: 'calendar',
+                displayFormat: this.format,
+            }, options))
+            .dxDateBox('instance');
+        this.input = this.rootElement.find(TEXTEDITOR_INPUT_SELECTOR);
     }
-});
+
+    dispose() {
+        this.rootElement.empty();
+        $.cleanData(this.rootElement);
+        this.dateBox = null;
+    }
+}
+
+DevExpress.ui.testing.BaseCalendarFixture = BaseCalendarFixture;
+DevExpress.ui.testing.CalendarFixture = CalendarFixture;
+DevExpress.ui.testing.DateBoxFixture = DateBoxFixture;