test: add tests for codecs

Author: JKRhb

test/core/codec_test.dart

@@ -0,0 +1,97 @@
+// 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 'dart:convert';
+
+import 'package:dart_wot/scripting_api.dart';
+import 'package:dart_wot/src/core/codecs/cbor_codec.dart';
+import 'package:dart_wot/src/core/codecs/json_codec.dart' as json_codec;
+import 'package:dart_wot/src/core/codecs/text_codec.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('TextCodec should', () {
+    test('convert bytes to values and back', () {
+      final textCodec = TextCodec();
+
+      const testValue = 'foo';
+      final testInput = utf8.encode(testValue);
+
+      final convertedValue = textCodec.bytesToValue(testInput, null, {});
+      expect(convertedValue?.value, testValue);
+
+      final convertedBytes = textCodec.valueToBytes(convertedValue, null, {});
+
+      expect(convertedBytes, testInput);
+
+      final convertedNullValue = textCodec.valueToBytes(null, null, {});
+      expect(convertedNullValue, []);
+    });
+
+    test('reject unknown charsets', () {
+      final textCodec = TextCodec();
+
+      const charsetParameters = {'charset': 'foobar'};
+
+      expect(
+        () =>
+            textCodec.bytesToValue(utf8.encode('foo'), null, charsetParameters),
+        throwsFormatException,
+      );
+
+      expect(
+        () => textCodec.valueToBytes(
+          DataSchemaValue.fromNull(),
+          null,
+          charsetParameters,
+        ),
+        throwsFormatException,
+      );
+    });
+  });
+
+  group('JsonCodec should', () {
+    test('convert bytes to values and back', () {
+      final jsonCodec = json_codec.JsonCodec();
+
+      const testValue = 'foo';
+      final testInput = utf8.encode('"$testValue"');
+
+      final convertedValue = jsonCodec.bytesToValue(testInput, null, {});
+      expect(convertedValue?.value, testValue);
+
+      final convertedBytes = jsonCodec.valueToBytes(convertedValue, null, {});
+
+      expect(convertedBytes, testInput);
+
+      final convertedNullValue = jsonCodec.valueToBytes(null, null, {});
+      expect(convertedNullValue, []);
+    });
+  });
+
+  group('CborCodec should', () {
+    test('convert bytes to values and back', () {
+      final cborCodec = CborCodec();
+      const testValue = {
+        'foo': ['bar', 'baz'],
+      };
+
+      final convertedBytes = cborCodec
+          .valueToBytes(DataSchemaValue.fromObject(testValue), null, {});
+
+      expect(
+        convertedBytes,
+        [161, 99, 102, 111, 111, 130, 99, 98, 97, 114, 99, 98, 97, 122],
+      );
+
+      final convertedValue = cborCodec.bytesToValue(convertedBytes, null, {});
+      expect(convertedValue?.value, testValue);
+
+      final convertedNullValue = cborCodec.valueToBytes(null, null, {});
+      expect(convertedNullValue, []);
+    });
+  });
+}