Added testcases for using vendor specific types with the factory regi…

…stries

packages/kiota_abstractions/test/serialization/parse_node_factory_registry_test.dart

@@ -0,0 +1,23 @@
+import 'dart:convert';
+
+import 'package:kiota_abstractions/kiota_abstractions.dart';
+import 'package:mockito/annotations.dart';
+import 'package:mockito/mockito.dart';
+import 'package:test/test.dart';
+import 'parse_node_factory_registry_test.mocks.dart';
+
+@GenerateMocks([ParseNodeFactory, ParseNode])
+void main() {
+  group('ParseNodeFactoryRegistry', () {
+    test('VendorSpecificContentType', () {
+      const contentType = 'application/json';
+      final mockFactory = MockParseNodeFactory();
+      final jsonStream= utf8.encode('{"test": "input"}');
+      final mockParseNode = MockParseNode();
+      when(mockFactory.getRootParseNode(contentType, jsonStream)).thenReturn(mockParseNode);
+      ParseNodeFactoryRegistry.defaultInstance.contentTypeAssociatedFactories.putIfAbsent(contentType, ()=>mockFactory);
+      final rootParseNode = ParseNodeFactoryRegistry.defaultInstance.getRootParseNode('application/vnd+json', jsonStream);
+      expect(rootParseNode, isNotNull);
+    });
+  });
+}

packages/kiota_abstractions/test/serialization/serialization_writer_factory_registry_test.dart

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+import 'package:kiota_abstractions/kiota_abstractions.dart';
+import 'package:mockito/annotations.dart';
+import 'package:mockito/mockito.dart';
+import 'package:test/test.dart';
+import 'serialization_writer_factory_registry_test.mocks.dart';
+
+@GenerateMocks([SerializationWriter, SerializationWriterFactory])
+void main() {
+  group('SerializationWriterFactoryRegistry', () {
+    test('VendorSpecificContentType', () {
+      const contentType = 'application/text';
+      final mockWriter = MockSerializationWriter();
+      final mockFactory = MockSerializationWriterFactory();
+      when(mockFactory.getSerializationWriter(contentType)).thenReturn(mockWriter);
+      SerializationWriterFactoryRegistry.defaultInstance.contentTypeAssociatedFactories.putIfAbsent(contentType, () => mockFactory);
+      final serializationWriter = SerializationWriterFactoryRegistry.defaultInstance.getSerializationWriter('application/vnd+text');
+      expect(serializationWriter, isNotNull);
+    });
+  });
+}