Remove duplicated features folder in unit test

test/features/email/presentation/extensions/calendar_event_extension_test.dart

@@ -1,10 +1,12 @@
+import 'package:date_format/date_format.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:date_format/date_format.dart' as date_format;
+import 'package:jmap_dart_client/jmap/core/utc_date.dart';
 import 'package:jmap_dart_client/jmap/mail/calendar/calendar_event.dart';
 import 'package:tmail_ui_user/features/email/presentation/extensions/calendar_event_extension.dart';
 
 void main() {
-  group('calendar event extension test', () {
+  group('calendar_event_extension::formatDateTime::test', () {
     final dateTime = DateTime(2021, 10, 10, 10, 30, 00, 00, 00);
 
     const locale = date_format.EnglishDateLocale();
@@ -27,4 +29,48 @@ void main() {
       expect(formattedTime, expectedFormattedTime);
     });
   });
+
+  group('calendar_event_extension::dateTimeEventAsString::test', () {
+    test('dateTimeEventAsString should return string with format start date - end date (timezone offset) and date formatted as DD, MM dd, YYYY for all-day event for many days', () {
+      const expectedFormattedDateString = 'Sunday, October 10, 2021 - Sunday, October 24, 2021 (GMT+0)';
+
+      final startDate = DateTime(2021, 10, 10, 00, 00, 00, 00, 00);
+      final endDate = DateTime(2021, 10, 25, 00, 00, 00, 00, 00);
+
+      final calendarEvent = CalendarEvent(
+        startDate: startDate,
+        endDate: endDate,
+        startUtcDate: UTCDate(startDate),
+        endUtcDate: UTCDate(endDate),
+      );
+
+      final formattedDateString = calendarEvent.getDateTimeEvent(
+          timeZone: 'GMT+0',
+          dateLocale: const EnglishDateLocale()
+      );
+
+      expect(formattedDateString, expectedFormattedDateString);
+    });
+
+    test('dateTimeEventAsString should return string with format date (timezone offset) and date formatted as DD, MM dd, YYYY for all-day event for one day', () {
+      const expectedFormattedDateString = 'Sunday, October 10, 2021 (GMT+0)';
+
+      final startDate = DateTime(2021, 10, 10, 00, 00, 00, 00, 00);
+      final endDate = DateTime(2021, 10, 11, 00, 00, 00, 00, 00);
+
+      final calendarEvent = CalendarEvent(
+        startDate: startDate,
+        endDate: endDate,
+        startUtcDate: UTCDate(startDate),
+        endUtcDate: UTCDate(endDate),
+      );
+
+      final formattedDateString = calendarEvent.getDateTimeEvent(
+        timeZone: 'GMT+0',
+        dateLocale: const EnglishDateLocale()
+      );
+
+      expect(formattedDateString, expectedFormattedDateString);
+    });
+  });
 }