整个课程和数据UI重新设计版本

kouyu_english/test/deepseek_thinking_test.dart

@@ -105,6 +105,32 @@ void main() {
     expect(jsonDecode(messages![1]['content'] as String), {
       'reply': "Hi! What's your name?",
     });
-    expect(messages![2], {'role': 'user', 'content': 'My name is Alex.'});
+    expect(messages![2]['role'], 'user');
+    final last = messages![2]['content'] as String;
+    expect(last, startsWith('My name is Alex.'));
+    expect(
+      last,
+      endsWith('After your line the learner has to: say where they are from.'),
+    );
+    expect(messages![0]['content'], isNot(contains('Ask where the learner')));
+  });
+
+  test('dialogue system prompt stays identical across turns', () {
+    final words = ['Excuse me.', 'Can you help me?'];
+    final a = AiService.dialogueSystemPrompt(
+      level: 'A1',
+      allowedLanguage: words,
+    );
+    final b = AiService.dialogueSystemPrompt(
+      level: 'A1',
+      allowedLanguage: words,
+    );
+    expect(a, b);
+    expect(a, contains('CEFR A1'));
+    expect(a, endsWith('Taught language: Excuse me.; Can you help me?'));
+    expect(
+      AiService.dialogueSystemPrompt(level: 'A0', allowedLanguage: const []),
+      contains('A0 English conversation partner'),
+    );
   });
 }