feat: 完善听力口语辅助状态记录、练习分块与复习抽查间隔机制

kouyu_english/test/placement_and_scene_test.dart

@@ -70,6 +70,32 @@ void main() {
     expect(find.text('从更简单内容开始'), findsNothing);
   });
 
+  testWidgets('self-reported basics move a learner who passes both checks', (
+    tester,
+  ) async {
+    final state = AppState();
+    await tester.pumpWidget(
+      MaterialApp(
+        home: PlacementPage(state: state, onStart: () {}),
+      ),
+    );
+    await tester.tap(find.text('能说一点'));
+    await tester.tap(find.text('开始 3 分钟定位'));
+    await tester.pumpAndSettle();
+    await tester.tap(find.text('你好，我叫 Mia，很高兴认识你。'));
+    await tester.pump();
+    await tester.tap(find.text('下一题'));
+    await tester.pumpAndSettle();
+    await tester.tap(find.text('现在不方便开口，跳过'));
+    await tester.pumpAndSettle();
+    await tester.enterText(find.byType(TextField), 'My name is Mia.');
+    await tester.tap(find.text('查看建议'));
+    await tester.pumpAndSettle();
+    expect(find.text('建议从 A0 第 3 课开始'), findsOneWidget);
+    await tester.tap(find.text('开始今天学习'));
+    expect(state.placementStartLessonId, 'a0-03');
+  });
+
   testWidgets('scene page lists open and locked scenes', (tester) async {
     final state = AppState()
       ..completedLessonIds.addAll(['a0-01', 'a0-02', 'a0-03', 'a0-04']);