TF-4370 Add description field to Label object

labels/lib/model/label.dart

@@ -23,12 +23,14 @@ class Label with EquatableMixin {
   final KeyWordIdentifier? keyword;
   final String? displayName;
   final HexColor? color;
+  final String? description;
 
   Label({
     this.id,
     this.keyword,
     this.displayName,
     this.color,
+    this.description,
   });
 
   factory Label.fromJson(Map<String, dynamic> json) => _$LabelFromJson(json);
@@ -41,5 +43,6 @@ class Label with EquatableMixin {
         keyword,
         displayName,
         color,
+        description,
       ];
 }

labels/test/method/model/label_test.dart

@@ -0,0 +1,91 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:jmap_dart_client/jmap/core/id.dart';
+import 'package:jmap_dart_client/jmap/mail/email/keyword_identifier.dart';
+import 'package:labels/model/hex_color.dart';
+import 'package:labels/model/label.dart';
+
+void main() {
+  group('Label', () {
+    group('fromJson', () {
+      test('should deserialize all fields correctly', () {
+        final json = {
+          "id": "123",
+          "keyword": "important",
+          "displayName": "Important",
+          "color": "#ff0000",
+          "description": "Important emails"
+        };
+
+        final label = Label.fromJson(json);
+
+        expect(label.id, equals(Id('123')));
+        expect(label.keyword, equals(KeyWordIdentifier('important')));
+        expect(label.displayName, equals('Important'));
+        expect(label.color, equals(HexColor('#ff0000')));
+        expect(label.description, equals('Important emails'));
+      });
+
+      test('should handle missing optional fields', () {
+        final json = {
+          "displayName": "Simple label",
+        };
+
+        final label = Label.fromJson(json);
+
+        expect(label.id, isNull);
+        expect(label.keyword, isNull);
+        expect(label.color, isNull);
+        expect(label.description, isNull);
+      });
+    });
+
+    group('toJson', () {
+      test('should serialize all fields correctly', () {
+        final label = Label(
+          id: Id('123'),
+          keyword: KeyWordIdentifier('important'),
+          displayName: 'Important',
+          color: HexColor('#ff0000'),
+          description: 'Important emails',
+        );
+
+        final json = label.toJson();
+
+        expect(json['id'], equals('123'));
+        expect(json['keyword'], equals('important'));
+        expect(json['displayName'], equals('Important'));
+        expect(json['color'], equals('#ff0000'));
+        expect(json['description'], equals('Important emails'));
+      });
+
+      test('should not include null fields', () {
+        final label = Label(
+          displayName: 'Label',
+        );
+
+        final json = label.toJson();
+
+        expect(json.containsKey('id'), isFalse);
+        expect(json.containsKey('keyword'), isFalse);
+        expect(json.containsKey('color'), isFalse);
+        expect(json.containsKey('description'), isFalse);
+      });
+    });
+
+    group('equatable', () {
+      test('should support value equality', () {
+        final label1 = Label(
+          displayName: 'Test',
+          description: 'desc',
+        );
+
+        final label2 = Label(
+          displayName: 'Test',
+          description: 'desc',
+        );
+
+        expect(label1, equals(label2));
+      });
+    });
+  });
+}

labels/test/method/set/set_label_method_test.dart

@@ -176,5 +176,67 @@ void main() {
       // Assert
       expect(call, throwsA(isA<DioException>()));
     });
+
+    test('should include description when creating label', () async {
+      // Arrange
+      final dio = createDio();
+      final adapter = DioAdapter(dio: dio);
+
+      adapter.onPost(
+        '',
+        (server) => server.reply(200, {
+          "sessionState": "session-state",
+          "methodResponses": [
+            [
+              "Label/set",
+              {
+                "accountId": accountId.id.value,
+                "newState": "new",
+                "created": {
+                  "A": {"id": "123", "keyword": "descTag"}
+                }
+              },
+              "c0"
+            ]
+          ]
+        }),
+        data: buildPayload({
+          "A": {
+            "displayName": "Tag with description",
+            "color": "#123456",
+            "description": "This is a test label"
+          }
+        }),
+        headers: createJMAPHeader(),
+      );
+
+      final builder = createBuilder(dio);
+
+      final method = SetLabelMethod(accountId)
+        ..addCreate(
+          Id('A'),
+          Label(
+            displayName: "Tag with description",
+            color: HexColor("#123456"),
+            description: "This is a test label",
+          ),
+        );
+
+      final invocation = builder.invocation(method);
+
+      // Act
+      final response = await (builder..usings(method.requiredCapabilities))
+          .build()
+          .execute();
+
+      final parsed = response.parse<SetLabelResponse>(
+        invocation.methodCallId,
+        SetLabelResponse.deserialize,
+      );
+
+      // Assert
+      expect(parsed, isNotNull);
+      expect(parsed!.created![Id('A')]!.keyword?.value, equals('descTag'));
+    });
   });
 }