Preserve courses with pending rooms and report precise graduate import errors

mobile/test/school/recognized_timetable_test.dart

@@ -16,6 +16,31 @@ String fixture() {
 
 void main() {
   final url = Uri.parse('https://yjsjy.uestc.edu.cn/pyxx/pygl/xskbcx/index/1');
+  test('graduate course identifiers need not be numeric and missing rooms remain explicit', () {
+    final body = fixture()
+        .replaceAll('101/示例', 'G101/示例')
+        .replaceAll('/示例楼B212', '/');
+    final draft = SchoolPageAdapter().extract(body, url);
+    expect(draft.courses, hasLength(4));
+    final pending = draft.courses.where((c) => c.name.contains('集成电路'));
+    expect(pending.every((c) => c.room == '教室待定'), isTrue);
+    expect(pending.every((c) => c.notes.contains('学校未提供教室')), isTrue);
+  });
+  test('graduate malformed record provides a safe specific reason', () {
+    expect(
+      () => SchoolPageAdapter().extract(
+        fixture().replaceFirst('1-3周', '未知周'),
+        url,
+      ),
+      throwsA(
+        isA<UnsupportedSchoolLayout>().having(
+          (e) => e.toString(),
+          'reason',
+          contains('上课周次'),
+        ),
+      ),
+    );
+  });
   test('school DOM merges week segments without losing full metadata or evening periods', () {
     final draft = SchoolPageAdapter().extract(fixture(), url);
     expect(draft.courses.length, 4);

mobile/test/school/school_session_flow_test.dart

@@ -31,6 +31,59 @@ void main() {
     platform.delegate.finished(url);
   }
 
+  testWidgets(
+    'graduate parser rejection keeps its reason instead of becoming a network timeout',
+    (tester) async {
+      addTearDown(SchoolPageDiagnostic.instance.clear);
+      session.connectionState = SchoolConnectionState.connected;
+      await session.openTimetable(term: SchoolTerm(73));
+      platform.web.javascript = (_) async => schoolPageEvidence(
+        topUrl: platform.web.url!,
+        html: fixture().replaceFirst('1-3周', '未知周'),
+      );
+      await tester.runAsync(() async {
+        navigate(SchoolTerm(73).timetableUri.toString());
+        await flushSchoolEvents();
+      });
+      expect(session.message, contains('上课周次'));
+      await tester.pump(const Duration(seconds: 46));
+      expect(session.message, contains('上课周次'));
+      expect(session.message, isNot(contains('查找超时')));
+      expect(session.pendingDraft, isNull);
+      final log = utf8.decode(await DiagnosticLog.instance.export());
+      expect(log, contains('"code":"weeks_invalid"'));
+      expect(log, contains('"column":5'));
+      expect(log, isNot(contains('示例集成电路')));
+      SchoolPageDiagnostic.instance.clear();
+    },
+  );
+  testWidgets('a new graduate page never inherits an old parsing reason', (
+    tester,
+  ) async {
+    addTearDown(SchoolPageDiagnostic.instance.clear);
+    session.connectionState = SchoolConnectionState.connected;
+    await session.openTimetable(term: SchoolTerm(73));
+    platform.web.javascript = (_) async => schoolPageEvidence(
+      topUrl: platform.web.url!,
+      html: fixture().replaceFirst('1-3周', '未知周'),
+    );
+    await tester.runAsync(() async {
+      navigate(SchoolTerm(73).timetableUri.toString());
+      await flushSchoolEvents();
+    });
+    expect(session.message, contains('上课周次'));
+    platform.web.javascript = (_) async =>
+        schoolPageEvidence(topUrl: platform.web.url!);
+    await tester.runAsync(() async {
+      navigate(SchoolTerm(72).timetableUri.toString());
+      await flushSchoolEvents();
+    });
+    await tester.pump(const Duration(seconds: 46));
+    expect(session.message, contains('查找超时'));
+    expect(session.message, isNot(contains('上课周次')));
+    SchoolPageDiagnostic.instance.clear();
+  });
+
   test(
     'graduate auto read retains HTML after leaving and clears on next query',
     () async {

mobile/test/school/undergraduate_timetable_adapter_test.dart

@@ -7,6 +7,7 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:hepan_everyday/features/school/undergraduate/timetable_adapter.dart';
 import 'package:hepan_everyday/data/schedule_file_import.dart';
 import 'package:hepan_everyday/domain/school_identity.dart';
+import 'package:hepan_everyday/domain/course.dart';
 
 void main() {
   test('missing course fields identify the failing field without disclosing values', () {
@@ -15,7 +16,6 @@ void main() {
         'index=0*unitCount+0;table0.activities[index][table0.activities[index].length]=activity;';
     for (final entry in {
       'teacher_missing': base.replaceFirst('"教师"', '""'),
-      'room_missing': base.replaceFirst('"教室"', '""'),
       'course_sequence_invalid': base.replaceFirst('课程(C.01)', '课程'),
     }.entries) {
       expect(
@@ -51,6 +51,24 @@ void main() {
   String fixture() =>
       File('test/fixtures/school/undergraduate-timetable.html')
           .readAsStringSync();
+  test('missing room retains every scheduled occurrence and clearly marks it pending', () {
+    final original = UndergraduateTimetableAdapter.extract(fixture(), uri);
+    final draft = UndergraduateTimetableAdapter.extract(
+      fixture().replaceFirst('"教室1"', '""'),
+      uri,
+    );
+    Set<String> occurrences(Iterable<Course> courses) => <String>{
+      for (final c in courses)
+        for (final w in c.weeks)
+          for (var p = c.startPeriod; p <= c.endPeriod; p++)
+            '${c.courseCode}/${c.teacher}/${c.weekday}/$p/$w',
+    };
+    expect(occurrences(draft.courses), occurrences(original.courses));
+    final pending = draft.courses.where((c) => c.room == '教室待定');
+    expect(pending, isNotEmpty);
+    expect(pending.every((c) => c.notes.contains('学校未提供教室')), isTrue);
+    expect(draft.courses.any((c) => c.room == '教室2'), isTrue);
+  });
   test('undergraduate activity data preserves teachers rooms weeks and period twelve', () {
     final draft = UndergraduateTimetableAdapter.extract(fixture(), uri);
     expect(draft.schoolTerm!.id, 523);