TF-3379 Add unit test for getCountMailAddressWithoutMe method

model/test/extensions/presentattion_email_extension_test.dart

@@ -0,0 +1,65 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:jmap_dart_client/jmap/mail/email/email_address.dart';
+import 'package:model/extensions/presentation_email_extension.dart';
+import 'package:model/email/presentation_email.dart';
+
+void main() {
+  group('PresentationEmailExtension::getCountMailAddressWithoutMe::', () {
+    test('Should return the correct count of email addresses excluding the user', () {
+      // Arrange
+      final email = PresentationEmail(
+        to: {EmailAddress('Alice', 'alice@example.com')},
+        cc: {EmailAddress('Bob', 'bob@example.com')},
+        bcc: {EmailAddress('Charlie', 'charlie@example.com')},
+        from: {EmailAddress('User', 'user@example.com')},
+      );
+
+      // Act
+      final count = email.getCountMailAddressWithoutMe('user@example.com');
+
+      // Assert
+      expect(count, 3);
+    });
+
+    test('Should return 0 when all email addresses are the user', () {
+      // Arrange
+      final email = PresentationEmail(
+        to: {EmailAddress('User', 'user@example.com')},
+        cc: {EmailAddress('User', 'user@example.com')},
+        bcc: {EmailAddress('User', 'user@example.com')},
+        from: {EmailAddress('User', 'user@example.com')},
+      );
+
+      // Act
+      final count = email.getCountMailAddressWithoutMe('user@example.com');
+
+      // Assert
+      expect(count, 0);
+    });
+
+    test('Should return the correct count excluding multiple instances of the user', () {
+      // Arrange
+      final email = PresentationEmail(
+        to: {
+          EmailAddress('Alice', 'alice@example.com'),
+          EmailAddress('User', 'user@example.com')
+        },
+        cc: {
+          EmailAddress('User', 'user@example.com')
+        },
+        bcc: {
+          EmailAddress('Charlie', 'charlie@example.com')
+        },
+        from: {
+          EmailAddress('User', 'user@example.com')
+        },
+      );
+
+      // Act
+      final count = email.getCountMailAddressWithoutMe('user@example.com');
+
+      // Assert
+      expect(count, 2);
+    });
+  });
+}