test: add unit tests for GsodModalOld

test/gsod_modal_old_test.dart

@@ -0,0 +1,122 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:opso/modals/gsod/gsod_modal_old.dart';
+
+void main() {
+  group('GsodModalOld', () {
+    final tModal = GsodModalOld(
+      organizationName: 'TestOrg',
+      organizationUrl: 'https://testorg.com',
+      technicalWriter: 'Alice Writer',
+      mentor: 'Bob Mentor',
+      project: 'Improve Documentation',
+      projectUrl: 'https://testorg.com/project',
+      report: 'Final Report',
+      reportUrl: 'https://testorg.com/report',
+      originalProjectProposal: 'Original Proposal',
+      originalProjectProposalUrl: 'https://testorg.com/proposal',
+      year: 2020,
+    );
+
+    test('constructor sets all fields correctly', () {
+      expect(tModal.organizationName, 'TestOrg');
+      expect(tModal.organizationUrl, 'https://testorg.com');
+      expect(tModal.technicalWriter, 'Alice Writer');
+      expect(tModal.mentor, 'Bob Mentor');
+      expect(tModal.project, 'Improve Documentation');
+      expect(tModal.report, 'Final Report');
+      expect(tModal.year, 2020);
+    });
+
+    test('copyWith updates organizationName via organization param', () {
+      final updated = tModal.copyWith(organization: 'NewOrg', year: 2019);
+      expect(updated.organizationName, 'NewOrg');
+      expect(updated.year, 2019);
+      expect(updated.technicalWriter, tModal.technicalWriter);
+    });
+
+    test('copyWith with no args returns equivalent object', () {
+      final copy = tModal.copyWith();
+      expect(copy.organizationName, tModal.organizationName);
+      expect(copy.year, tModal.year);
+      expect(copy.mentor, tModal.mentor);
+    });
+
+    test('toMap returns correct map', () {
+      final map = tModal.toMap();
+      expect(map['organization'], 'TestOrg');
+      expect(map['organization_url'], 'https://testorg.com');
+      expect(map['technical_writer'], 'Alice Writer');
+      expect(map['mentor'], 'Bob Mentor');
+      expect(map['project'], 'Improve Documentation');
+      expect(map['report'], 'Final Report');
+      expect(map['year'], 2020);
+    });
+
+    test('fromMap constructs correctly', () {
+      final map = {
+        'organization': 'FromMap Org',
+        'organization_url': 'https://frommap.com',
+        'technical_writer': 'Jane',
+        'mentor': 'John',
+        'project': 'Docs Project',
+        'project_url': 'https://frommap.com/proj',
+        'report': 'Report',
+        'report_url': 'https://frommap.com/report',
+        'original_project_proposal': 'Proposal',
+        'original_project_proposal_url': 'https://frommap.com/proposal',
+        'year': 2019,
+      };
+      final modal = GsodModalOld.fromMap(map);
+      expect(modal.organizationName, 'FromMap Org');
+      expect(modal.technicalWriter, 'Jane');
+      expect(modal.year, 2019);
+    });
+
+    test('fromMap handles missing fields with empty string defaults', () {
+      final modal = GsodModalOld.fromMap({});
+      expect(modal.organizationName, '');
+      expect(modal.technicalWriter, '');
+      expect(modal.year, 0);
+    });
+
+    test('equality operator works correctly', () {
+      final other = GsodModalOld(
+        organizationName: 'TestOrg',
+        organizationUrl: 'https://testorg.com',
+        technicalWriter: 'Alice Writer',
+        mentor: 'Bob Mentor',
+        project: 'Improve Documentation',
+        projectUrl: 'https://testorg.com/project',
+        report: 'Final Report',
+        reportUrl: 'https://testorg.com/report',
+        originalProjectProposal: 'Original Proposal',
+        originalProjectProposalUrl: 'https://testorg.com/proposal',
+        year: 2020,
+      );
+      expect(tModal == other, isTrue);
+    });
+
+    test('inequality when fields differ', () {
+      final other = tModal.copyWith(year: 2021);
+      expect(tModal == other, isFalse);
+    });
+
+    test('hashCode is consistent for equal objects', () {
+      final other = tModal.copyWith();
+      expect(tModal.hashCode, equals(other.hashCode));
+    });
+
+    test('toJson returns valid JSON string', () {
+      final jsonStr = tModal.toJson();
+      expect(jsonStr, isA<String>());
+      expect(jsonStr.contains('TestOrg'), isTrue);
+    });
+
+    test('toString contains key fields', () {
+      final str = tModal.toString();
+      expect(str, contains('TestOrg'));
+      expect(str, contains('Alice Writer'));
+      expect(str, contains('2020'));
+    });
+  });
+}