register and add tests

lib/src/resource/registry.dart

@@ -69,6 +69,7 @@ class Registry {
     registerSubtype(ResourceRegistration(Sensor.subtype, (name, channel) => SensorClient(name, channel)));
     registerSubtype(ResourceRegistration(Servo.subtype, (name, channel) => ServoClient(name, channel)));
     registerSubtype(ResourceRegistration(VisionClient.subtype, (name, channel) => VisionClient(name, channel)));
+    registerSubtype(ResourceRegistration(DiscoveryClient.subtype, (name, channel) => DiscoverClient(name, channel)));
   }
 
   /// The [Subtype] available in the SDK

test/unit_test/services/discovery_test.dart

@@ -0,0 +1,39 @@
+import 'package:fixnum/fixnum.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:mockito/mockito.dart';
+import 'package:viam_sdk/protos/service/discovery.dart';
+import 'package:viam_sdk/src/gen/common/v1/common.pb.dart';
+import 'package:viam_sdk/src/gen/service/discovery/v1/discovery.pbgrpc.dart';
+import 'package:viam_sdk/viam_sdk.dart';
+
+import '../mocks/mock_response_future.dart';
+import '../mocks/service_clients_mocks.mocks.dart';
+
+class FakeDiscoveryClient extends DiscoverClient {
+  @override
+  DiscoveryServiceClient get client => _client;
+
+  final MockDiscoveryServiceClient _client;
+
+  FakeDiscoveryClient(super.name, super.channel, this._client);
+}
+
+void main() {
+  late DiscoveryClient client;
+  late MockDiscoveryServiceClient serviceClient;
+
+  setUp(() {
+    serviceClient = MockDiscoveryServiceClient();
+    client = FakeDiscoveryClient('discovery', MockClientChannelBase(), serviceClient);
+  });
+
+  group('Discovery RPC Client Tests', () {
+    test('discoverResources', () async {
+      final expected = [ComponentConfig()];
+      when(serviceClient.discoverResources(any))
+          .thenAnswer((_) => MockResponseFuture.value(DiscoverResourcesResponse(discovery: expected)));
+      final response = await client.discoverResources('discoveryName');
+      expect(response, equals(expected));
+    });
+  });
+}