test: add unit tests for RsocProjectModal

test/rsoc_project_modal_test.dart

@@ -0,0 +1,70 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:opso/modals/rsoc_project_modal.dart';
+
+void main() {
+  group('RsocProjectModal', () {
+    final tModal = RsocProjectModal(
+      name: 'TestProject',
+      contributor: 'Alice',
+      description: 'A test RSOC project',
+      githubUrl: 'https://github.com/test/rsoc',
+    );
+
+    test('constructor sets all fields correctly', () {
+      expect(tModal.name, 'TestProject');
+      expect(tModal.contributor, 'Alice');
+      expect(tModal.description, 'A test RSOC project');
+      expect(tModal.githubUrl, 'https://github.com/test/rsoc');
+    });
+
+    test('fromJson constructs correctly', () {
+      final json = {
+        'name': 'JsonProject',
+        'contributor': 'Bob',
+        'description': 'Json description',
+        'githubUrl': 'https://github.com/json/rsoc',
+      };
+      final modal = RsocProjectModal.fromJson(json);
+      expect(modal.name, 'JsonProject');
+      expect(modal.contributor, 'Bob');
+      expect(modal.description, 'Json description');
+      expect(modal.githubUrl, 'https://github.com/json/rsoc');
+    });
+
+    test('toJson returns correct map', () {
+      final map = tModal.toJson();
+      expect(map['name'], 'TestProject');
+      expect(map['contributor'], 'Alice');
+      expect(map['description'], 'A test RSOC project');
+      expect(map['githubUrl'], 'https://github.com/test/rsoc');
+    });
+
+    test('toJson and fromJson are symmetric', () {
+      final map = tModal.toJson();
+      final restored = RsocProjectModal.fromJson(map);
+      expect(restored.name, tModal.name);
+      expect(restored.contributor, tModal.contributor);
+      expect(restored.description, tModal.description);
+      expect(restored.githubUrl, tModal.githubUrl);
+    });
+
+    test('toString contains all fields', () {
+      final str = tModal.toString();
+      expect(str, contains('TestProject'));
+      expect(str, contains('Alice'));
+      expect(str, contains('A test RSOC project'));
+      expect(str, contains('https://github.com/test/rsoc'));
+    });
+
+    test('supports empty string fields', () {
+      final modal = RsocProjectModal(
+        name: '',
+        contributor: '',
+        description: '',
+        githubUrl: '',
+      );
+      expect(modal.name, '');
+      expect(modal.contributor, '');
+    });
+  });
+}