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tests/utils/test_network_logging.py

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+# Copyright 2026 The HuggingFace Team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import threading
+import time
+import unittest
+from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
+
+import httpx
+
+from transformers.utils.network_logging import (
+    _clear_network_debug_report,
+    _disable_network_debug_report,
+    _enable_network_debug_report,
+    _format_network_debug_report,
+    _get_network_debug_report,
+)
+
+
+class _SlowHandler(BaseHTTPRequestHandler):
+    def do_GET(self):
+        time.sleep(0.01)
+        response = b"ok"
+        self.send_response(200)
+        self.send_header("Content-Length", str(len(response)))
+        self.end_headers()
+        self.wfile.write(response)
+
+    def log_message(self, format, *args):
+        return
+
+
+class NetworkLoggingTester(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls):
+        cls._server = ThreadingHTTPServer(("127.0.0.1", 0), _SlowHandler)
+        cls._thread = threading.Thread(target=cls._server.serve_forever, daemon=True)
+        cls._thread.start()
+        cls._base_url = f"http://127.0.0.1:{cls._server.server_port}"
+
+    @classmethod
+    def tearDownClass(cls):
+        cls._server.shutdown()
+        cls._thread.join()
+        cls._server.server_close()
+
+    def tearDown(self):
+        _disable_network_debug_report()
+
+    def test_network_debug_report_records_httpx_requests(self):
+        _enable_network_debug_report()
+        _clear_network_debug_report()
+
+        response = httpx.get(f"{self._base_url}/slow")
+        self.assertEqual(response.text, "ok")
+
+        report = _get_network_debug_report()
+        matching_requests = [request for request in report["requests"] if request["url"].endswith("/slow")]
+        self.assertEqual(len(matching_requests), 1)
+
+        request = matching_requests[0]
+        self.assertEqual(request["method"], "GET")
+        self.assertEqual(request["status_code"], 200)
+        self.assertEqual(request["path"], "/slow")
+        self.assertGreater(request["total_ms"], 0)
+        self.assertIn("receive_response_headers", request["phases_ms"])
+
+        summary = _format_network_debug_report()
+        self.assertIn("Network debug report", summary)
+        self.assertIn("Slowest requests:", summary)
+        self.assertIn("/slow", summary)