Fix pytest-socket raises IndexError with httpx

pyproject.toml

@@ -31,7 +31,7 @@ classifiers = [
 ]
 
 [tool.poetry.dependencies]
-python = "^3.6"
+python = "^3.6.2"
 pytest = ">=3.6.3"
 
 [tool.poetry.dev-dependencies]
@@ -42,6 +42,7 @@ pytest-flake8 = "^1.0.4"
 asynctest = "^0.13.0"
 requests = "^2.26.0"
 starlette = "^0.14.2"
+httpx = "^0.21.1"
 
 [tool.poetry.plugins.pytest11]
 socket = 'pytest_socket'

pytest_socket.py

@@ -87,7 +87,7 @@ class GuardedSocket(socket.socket):
         def __new__(cls, *args, **kwargs):
             try:
                 is_unix_socket = args[0] == socket.AF_UNIX
-            except AttributeError:
+            except (AttributeError, IndexError):
                 # AF_UNIX not supported on Windows https://bugs.python.org/issue33408
                 is_unix_socket = False
 

tests/test_async.py

@@ -1,7 +1,7 @@
 import socket
 
 import pytest
-
+from test_socket import assert_socket_blocked
 
 unix_sockets_only = pytest.mark.skipif(
     not hasattr(socket, "AF_UNIX"),
@@ -54,3 +54,22 @@ def test_app():
     """)
     result = testdir.runpytest("--verbose", "--disable-socket", "--allow-unix-socket")
     result.assert_outcomes(passed=1, skipped=0, failed=0)
+
+
+@unix_sockets_only
+def test_httpx_fails(testdir):
+    testdir.makepyfile("""
+        import pytest
+        import httpx
+
+
+        @pytest.fixture(autouse=True)
+        def anyio_backend():
+            return "asyncio"
+
+        async def test_httpx():
+            async with httpx.AsyncClient() as client:
+                await client.get("http://www.example.com/")
+    """)
+    result = testdir.runpytest("--verbose", "--disable-socket", "--allow-unix-socket")
+    assert_socket_blocked(result)