Move withUrl to an extension method

lib/kiota_abstractions.dart

@@ -15,6 +15,7 @@ import 'package:std_uritemplate/std_uritemplate.dart';
 
 part 'src/api_client_builder.dart';
 part 'src/base_request_builder.dart';
+part 'src/extensions/base_request_builder_extensions.dart';
 part 'src/extensions/map_extensions.dart';
 part 'src/extensions/request_information_extensions.dart';
 part 'src/http_method.dart';

lib/src/base_request_builder.dart

@@ -19,8 +19,4 @@ abstract class BaseRequestBuilder<T extends BaseRequestBuilder<T>> {
 
   /// Clones the current request builder.
   T clone();
-
-  /// Clones the current request builder using [clone] and sets the given
-  /// [template] as the url template.
-  T withUrl(String template) => this.clone()..urlTemplate = template;
 }

lib/src/extensions/base_request_builder_extensions.dart

@@ -0,0 +1,11 @@
+part of '../../kiota_abstractions.dart';
+
+extension BaseRequestBuilderExtensions<T extends BaseRequestBuilder<T>> on BaseRequestBuilder<T> {
+  /// Clones the current request builder using [clone] and sets the given
+  /// [rawUrl] as the url to use.
+  ///
+  /// This utilizes the [RequestInformation.rawUrlKey] to store the raw url
+  /// in the [pathParameters].
+  T withUrl(String rawUrl) => clone()
+    ..pathParameters.addOrReplace(RequestInformation.rawUrlKey, rawUrl);
+}

test/request_builder_test.dart

@@ -20,14 +20,14 @@ class SampleRequestBuilder extends BaseRequestBuilder<SampleRequestBuilder> {
       id,
       requestAdapter,
       urlTemplate,
-      pathParameters,
+      {...pathParameters},
     );
   }
 }
 
 @GenerateMocks([RequestAdapter])
 void main() {
-  test('BaseRequestBuilder.copyWith', () {
+  test('BaseRequestBuilder.withUrl', () {
     final mockRequestAdapter = MockRequestAdapter();
 
     final requestBuilder = SampleRequestBuilder(
@@ -38,18 +38,21 @@ void main() {
     );
 
     final newRequestBuilder =
-        requestBuilder.withUrl('https://graph.microsoft.com/v2.0/users/{id}');
+        requestBuilder.withUrl('https://graph.microsoft.com/v2.0/users/123');
 
     expect(newRequestBuilder.id, equals(1));
     expect(
-      newRequestBuilder.urlTemplate,
-      equals('https://graph.microsoft.com/v2.0/users/{id}'),
+      newRequestBuilder.pathParameters,
+      equals({
+        'id': '1',
+        'request-raw-url': 'https://graph.microsoft.com/v2.0/users/123',
+      }),
     );
 
     // make sure the original requestBuilder is not modified
     expect(
-      requestBuilder.urlTemplate,
-      equals('https://graph.microsoft.com/v1.0/users/{id}'),
+      requestBuilder.pathParameters,
+      equals({'id': '1'}),
     );
   });
 }