From 3151dc07732174034919c14f5e362fd4422fea46 Mon Sep 17 00:00:00 2001
From: Alex Chen <l46983284@gmail.com>
Date: Thu, 16 Jul 2026 15:20:59 +0000
Subject: [PATCH] Stop depending on deprecated PyPI curio in tests

Curio no longer publishes to PyPI, so the optional test dependency
breaks installs and CI that try to pull it. Keep the runtime curio
detection path, but cover it with a tiny module stub instead of
installing the unmaintained package.

Fixes #34

Signed-off-by: Alex Chen <l46983284@gmail.com>
---
 newsfragments/34.bugfix.rst    |  1 +
 pyproject.toml                 |  1 -
 sniffio/_tests/test_sniffio.py | 31 +++++++++++++++++--------------
 3 files changed, 18 insertions(+), 15 deletions(-)
 create mode 100644 newsfragments/34.bugfix.rst

diff --git a/newsfragments/34.bugfix.rst b/newsfragments/34.bugfix.rst
new file mode 100644
index 0000000..2018b38
--- /dev/null
+++ b/newsfragments/34.bugfix.rst
@@ -0,0 +1 @@
+Stop depending on the unmaintained PyPI ``curio`` package in tests; keep curio detection covered with a lightweight stub.
diff --git a/pyproject.toml b/pyproject.toml
index cd73b2a..4824f25 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,7 +38,6 @@ Changelog = "https://sniffio.readthedocs.io/en/latest/history.html"
 test = [
     "pytest",
     "pytest-cov",
-    "curio",
 ]
 rtd = [
     "sphinx >= 1.6.1",
diff --git a/sniffio/_tests/test_sniffio.py b/sniffio/_tests/test_sniffio.py
index 02945a9..cc466a2 100644
--- a/sniffio/_tests/test_sniffio.py
+++ b/sniffio/_tests/test_sniffio.py
@@ -1,5 +1,5 @@
-import os
 import sys
+import types
 
 import pytest
 
@@ -58,27 +58,30 @@ async def this_is_asyncio():
         current_async_library()
 
 
-@pytest.mark.skipif(
-    sys.version_info >= (3, 12),
-    reason=
-    "curio broken on 3.12 (https://github.com/python-trio/sniffio/pull/42)",
-)
-def test_curio():
-    import curio
+def test_curio_detection_without_installing_curio():
+    """Exercise the curio branch without the deprecated PyPI package.
 
+    Curio no longer ships releases on PyPI (see issue #34). Runtime support
+    remains for environments that still vendor curio; this test stubs the
+    tiny public surface sniffio actually imports.
+    """
     with pytest.raises(AsyncLibraryNotFoundError):
         current_async_library()
 
-    ran = []
+    meta = types.ModuleType("curio.meta")
+    meta.curio_running = lambda: True
+    curio = types.ModuleType("curio")
+    curio.meta = meta
 
-    async def this_is_curio():
+    sys.modules["curio"] = curio
+    sys.modules["curio.meta"] = meta
+    try:
         assert current_async_library() == "curio"
         # Call it a second time to exercise the caching logic
         assert current_async_library() == "curio"
-        ran.append(True)
-
-    curio.run(this_is_curio)
-    assert ran == [True]
+    finally:
+        sys.modules.pop("curio.meta", None)
+        sys.modules.pop("curio", None)
 
     with pytest.raises(AsyncLibraryNotFoundError):
         current_async_library()