72일차 정답 추가 (실습 정답본 · answers · VIBE-A · tbench)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Last3Mon/72/tbench/tests/conftest.py

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+"""A fake server inside pytest, so tests never call the real helpdesk (or OpenAI).
+
+Query options: delay=<s>, fail_every=<k> (every k-th call answers 500), first_delay=<s>,
+status=<code>, timings=1 (answer with a helpdesk-like `timings`). Counters reset per test.
+"""
+import json
+import threading
+import time
+from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
+from urllib.parse import parse_qs, urlparse
+
+import pytest
+
+
+class Handler(BaseHTTPRequestHandler):
+    def log_message(self, *args):
+        pass
+
+    def do_POST(self):
+        length = int(self.headers.get("Content-Length") or 0)
+        self.server.bodies.append(self.rfile.read(length).decode())
+        self.handle_call()
+
+    def do_GET(self):
+        self.handle_call()
+
+    def handle_call(self):
+        q = {k: v[0] for k, v in parse_qs(urlparse(self.path).query).items()}
+        with self.server.lock:
+            self.server.count += 1
+            count = self.server.count
+        delay = float(q.get("first_delay", 0)) if count == 1 and "first_delay" in q else float(q.get("delay", 0))
+        time.sleep(delay)
+        status = int(q.get("status", 200))
+        if "fail_every" in q and count % int(q["fail_every"]) == 0:
+            status = 500
+        payload = {"count": count}
+        if q.get("timings"):
+            payload["timings"] = {"classify_ms": 100 * count, "answer_ms": 300, "total_ms": 400 + 100 * count}
+        data = json.dumps(payload).encode()
+        try:
+            self.send_response(status)
+            self.send_header("Content-Type", "application/json")
+            self.send_header("Content-Length", str(len(data)))
+            self.end_headers()
+            self.wfile.write(data)
+        except (BrokenPipeError, ConnectionResetError):
+            pass
+
+
+@pytest.fixture
+def server(tmp_path, monkeypatch):
+    monkeypatch.setenv("TBENCH_HOME", str(tmp_path / "home"))
+    httpd = ThreadingHTTPServer(("127.0.0.1", 0), Handler)
+    httpd.daemon_threads = True
+    httpd.count, httpd.lock, httpd.bodies = 0, threading.Lock(), []
+    threading.Thread(target=httpd.serve_forever, daemon=True).start()
+    httpd.base = f"http://127.0.0.1:{httpd.server_address[1]}/hook"
+    yield httpd
+    httpd.shutdown()
+    httpd.server_close()
+
+
+@pytest.fixture
+def body_file(tmp_path):
+    p = tmp_path / "faq-vpn.json"
+    p.write_text(json.dumps({"question": "VPN 접속이 자꾸 끊겨요", "no_cache": True}, ensure_ascii=False))
+    return p