test(gateway): trim docstrings

tests/gateway/test_71671_faulthandler_no_stderr.py

@@ -0,0 +1,47 @@
+"""Regression: #71671 — gateway must survive faulthandler.enable() with sys.stderr=None."""
+
+from __future__ import annotations
+
+import faulthandler
+import os
+import sys
+
+import pytest
+
+
+def test_faulthandler_enable_falls_back_when_stderr_is_none(tmp_path):
+    was_enabled = faulthandler.is_enabled()
+    if was_enabled:
+        faulthandler.disable()
+
+    real_stderr = sys.stderr
+    sys.stderr = None
+    try:
+        with pytest.raises(RuntimeError, match="sys.stderr is None"):
+            faulthandler.enable()
+
+        log_path = tmp_path / "gateway_faulthandler.log"
+        fh = open(log_path, "a", encoding="utf-8")
+        try:
+            faulthandler.enable(file=fh, all_threads=True)
+            assert faulthandler.is_enabled()
+            assert log_path.exists()
+        finally:
+            faulthandler.disable()
+            fh.close()
+    finally:
+        sys.stderr = real_stderr
+        if was_enabled:
+            faulthandler.enable()
+
+
+def test_gateway_run_keeps_faulthandler_guard():
+    src = os.path.join(
+        os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__)))),
+        "gateway", "run.py",
+    )
+    with open(src, encoding="utf-8") as f:
+        text = f.read()
+    assert "try:\n            faulthandler.enable()\n        except (RuntimeError, ValueError, OSError):" in text, (
+        "gateway/run.py must keep the try/except guard around faulthandler.enable() (see #71671)"
+    )