TF-1706 Fix grey bar on server CYRUS

(cherry picked from commit 3ae632c967607cd84ddd79da8d9e17421f6b31ff)

test/features/email/avatar_email_test.dart

@@ -0,0 +1,31 @@
+
+import 'package:core/presentation/extensions/color_extension.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:model/extensions/presentation_email_extension.dart';
+
+import '../../fixtures/email_fixtures.dart';
+
+void main() {
+
+  group('avatar_email test', () {
+    test('presentationEmail.avatarColors should return list color when `From` email is NotNull and NotEmpty', () {
+      final listColors = EmailFixtures.presentationEmailWithFromIsNotNull.avatarColors;
+      
+      expect(listColors.length, equals(2));
+    });
+
+    test('presentationEmail.avatarColors should return list default color when `From` email is Null', () {
+      final listColors = EmailFixtures.presentationEmailWithFromIsNull.avatarColors;
+
+      expect(listColors, containsAll(AppColor.mapGradientColor.first));
+      expect(listColors.length, equals(2));
+    });
+
+    test('presentationEmail.avatarColors should return list default color when `From` email is Empty', () {
+      final listColors = EmailFixtures.presentationEmailWithFromIsEmpty.avatarColors;
+
+      expect(listColors, containsAll(AppColor.mapGradientColor.first));
+      expect(listColors.length, equals(2));
+    });
+  });
+}