add chinese subtitles

sentence_api/tests/test_ai_tutor.py

@@ -71,3 +71,34 @@ def test_ai_tutor_rejects_unexpected_response(monkeypatch):
 
     with pytest.raises(AITutorError):
         tutor.explain("Hello.")
+
+
+from sentence_api.ai_tutor import _parse_translation_payload
+
+
+def test_ai_tutor_translates_full_document(monkeypatch):
+    requests_payloads = []
+
+    def fake_post(endpoint, headers, json, timeout):
+        requests_payloads.append((endpoint, headers, json, timeout))
+        return FakeResponse(body={"choices": [{"message": {"content": '["你好。", "见到你很高兴。"]'}}]})
+
+    monkeypatch.setattr("sentence_api.ai_tutor.requests.post", fake_post)
+    tutor = AITutor("https://ai.test/v1", "secret", "test-model", 1.5)
+
+    translated = tutor.translate_sentences(
+        [(0, "Hello."), (1, "Nice to meet you.")],
+        course_title="Greetings",
+    )
+
+    assert translated == {0: "你好。", 1: "见到你很高兴。"}
+    _endpoint, _headers, payload, timeout = requests_payloads[0]
+    user_prompt = payload["messages"][1]["content"]
+    assert "Hello." in user_prompt
+    assert "Nice to meet you." in user_prompt
+    assert timeout == 90.0
+
+
+def test_parse_translation_payload_accepts_fenced_json_and_numbered_lines():
+    assert _parse_translation_payload('```json\n["一", "二"]\n```', 2) == ["一", "二"]
+    assert _parse_translation_payload("1. 一\n2. 二", 2) == ["一", "二"]