test: add tests for JSON schema validation of values

test/content_serdes_test.dart

@@ -0,0 +1,45 @@
+// Copyright 2022 The NAMIB Project Developers. 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/src/core/content.dart';
+import 'package:dart_wot/src/core/content_serdes.dart';
+import 'package:dart_wot/src/definitions/data_schema.dart';
+import 'package:test/test.dart';
+
+Content _getTestContent() {
+  return Content("application/json", Stream<List<int>>.value('42'.codeUnits));
+}
+
+void main() {
+  group('Content Serdes Tests', () {
+    setUp(() {
+      // Additional setup goes here.
+    });
+  });
+
+  test('Content Validation', () async {
+    final contentSerdes = ContentSerdes();
+
+    final testContent1 = _getTestContent();
+    final successfulSchema =
+        DataSchema.fromJson(<String, dynamic>{"type": "number"});
+
+    expect(
+        await contentSerdes.contentToValue(testContent1, successfulSchema), 42);
+
+    final testContent2 = _getTestContent();
+    final failingSchema =
+        DataSchema.fromJson(<String, dynamic>{"type": "string"});
+
+    expect(contentSerdes.contentToValue(testContent2, failingSchema),
+        throwsA(TypeMatcher<ContentSerdesException>()));
+
+    expect(
+        () =>
+            contentSerdes.valueToContent(42, failingSchema, "application/json"),
+        throwsA(TypeMatcher<ContentSerdesException>()));
+  });
+}