feat: code task required for lesson completion (P0.4)

app/main.py

@@ -192,19 +192,31 @@ def submit_lesson(lesson_id: str, submission: Submission) -> dict:
     question_ids = {question["id"] for question in lesson["questions"]}
     results, correct_count = grade_answers(submission.answers, question_ids)
     total = len(question_ids)
-    passed = correct_count >= 2
+    code_question_ids = [
+        question["id"] for question in lesson["questions"] if question["kind"] == "code"
+    ]
+    code_correct = bool(code_question_ids) and all(
+        any(r["question_id"] == question_id and r["correct"] for r in results)
+        for question_id in code_question_ids
+    )
+    passed = (not code_question_ids or code_correct) and correct_count * 3 >= total * 2
     gained = 0
     if passed:
         gained, _ = save_lesson(lesson_id, correct_count, total, lesson["xp"])
     return {
         "passed": passed,
         "correct_count": correct_count,
         "total_count": total,
+        "code_correct": code_correct,
         "xp_gained": gained,
         "results": results,
         "message": "Урок пройден! Новый урок уже открыт."
         if passed
-        else "Нужно минимум 2 верных ответа из 3. Попробуй ещё раз — это нормально.",
+        else (
+            "Для зачёта нужно решить задачу на код"
+            if correct_count * 3 >= total * 2 and not code_correct
+            else "Нужно минимум 2 верных ответа из 3. Попробуй ещё раз — это нормально."
+        ),
     }
 
 

tests/test_api.py

@@ -57,3 +57,34 @@ def test_extended_course_unlocks_after_foundation() -> None:
         assert code_check.status_code == 200
         assert code_check.json()["correct"] is True
         client.post("/api/reset")
+
+
+def test_lesson_requires_correct_code_for_completion() -> None:
+    with TestClient(app) as client:
+        client.post("/api/reset")
+        two_without_code = [
+            {"question_id": "hello-print", "answer": "print('Привет')"},
+            {"question_id": "hello-string", "answer": "строка"},
+            {"question_id": "hello-code", "answer": ""},
+        ]
+        response = client.post("/api/lessons/hello/submit", json={"answers": two_without_code})
+        assert response.json()["passed"] is False
+        assert response.json()["message"] == "Для зачёта нужно решить задачу на код"
+
+        code_and_one_other = [
+            {"question_id": "hello-print", "answer": "print('неверно')"},
+            {"question_id": "hello-string", "answer": "строка"},
+            {"question_id": "hello-code", "answer": "print('Я начинаю путь в Python!')"},
+        ]
+        response = client.post("/api/lessons/hello/submit", json={"answers": code_and_one_other})
+        assert response.json()["passed"] is True
+
+        code_only = [
+            {"question_id": "hello-print", "answer": "неверно"},
+            {"question_id": "hello-string", "answer": "неверно"},
+            {"question_id": "hello-code", "answer": "print('Я начинаю путь в Python!')"},
+        ]
+        client.post("/api/reset")
+        response = client.post("/api/lessons/hello/submit", json={"answers": code_only})
+        assert response.json()["passed"] is False
+        client.post("/api/reset")