test(servient): add tests for handling ProtocolClientFactories

test/core/servient_test.dart

@@ -0,0 +1,61 @@
+// Copyright 2023 Contributors to the Eclipse Foundation. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+//
+// SPDX-License-Identifier: BSD-3-Clause
+
+import 'package:dart_wot/dart_wot.dart';
+import 'package:test/test.dart';
+
+const testUriScheme = 'test';
+
+class MockedProtocolClientFactory implements ProtocolClientFactory {
+  @override
+  ProtocolClient createClient() {
+    throw UnimplementedError('Instantiating a client is not supported yet.');
+  }
+
+  @override
+  bool destroy() {
+    return true;
+  }
+
+  @override
+  bool init() {
+    return true;
+  }
+
+  @override
+  Set<String> get schemes => {testUriScheme};
+}
+
+void main() {
+  group('Servient Tests', () {
+    test('Should accept a ProtocolClientFactory list as constructor argument',
+        () {
+      final servient = Servient(
+        clientFactories: [
+          MockedProtocolClientFactory(),
+        ],
+      );
+
+      expect(servient.clientSchemes, [testUriScheme]);
+      expect(servient.hasClientFor(testUriScheme), true);
+    });
+
+    test(
+      'Should allow for adding and removing a ProtocolClientFactory at runtime',
+      () {
+        final servient = Servient()
+          ..addClientFactory(MockedProtocolClientFactory());
+
+        expect(servient.hasClientFor(testUriScheme), true);
+
+        servient.removeClientFactory(testUriScheme);
+
+        expect(servient.hasClientFor(testUriScheme), false);
+        expect(servient.clientSchemes.length, 0);
+      },
+    );
+  });
+}