Added number_of_parameters rule copyWith test

Author: Aygistov

lint_test/analysis_options.yaml

@@ -15,7 +15,8 @@ custom_lint:
       exclude:
         - class_name: Exclude
           method_name: avoidNumberOfParameters
-        - method_name: avoidNumberOfParameters          
+        - method_name: avoidNumberOfParameters
+        - method_name: copyWith                  
     - function_lines_of_code:
       max_lines: 50
     - avoid_non_null_assertion

lint_test/number_of_parameters_test.dart

@@ -18,3 +18,28 @@ class Exclude {
     return a + b + c;
   }
 }
+
+class UserDto {
+  final String email;
+  final String firstName;
+  final String id;
+
+  const UserDto({
+    required this.email,
+    required this.firstName,
+    required this.id,
+  });
+
+  /// Excluded by method_name
+  UserDto copyWith({
+    String? email,
+    String? firstName,
+    String? id,
+  }) {
+    return UserDto(
+      email: email ?? this.email,
+      firstName: firstName ?? this.firstName,
+      id: id ?? this.id,
+    );
+  }
+}