Add a network pytest mark for tests that use the network

setup.cfg

@@ -21,6 +21,7 @@ filterwarnings =
   default:::uvicorn
 markers =
   copied_from(source, changes=None): mark test as copied from somewhere else, along with a description of changes made to accodomate e.g. our test setup
+  network: marks tests which require network connection. Used in 3rd-party build environments that have network disabled.
 
 [coverage:run]
 omit = venv/*, httpx/_compat.py

tests/client/test_proxies.py

@@ -122,6 +122,7 @@ def test_transport_for_request(url, proxies, expected):
 
 
 @pytest.mark.asyncio
+@pytest.mark.network
 async def test_async_proxy_close():
     try:
         client = httpx.AsyncClient(proxies={"https://": PROXY_URL})
@@ -130,6 +131,7 @@ async def test_async_proxy_close():
         await client.aclose()
 
 
+@pytest.mark.network
 def test_sync_proxy_close():
     try:
         client = httpx.Client(proxies={"https://": PROXY_URL})

tests/test_timeouts.py

@@ -23,6 +23,7 @@ async def test_write_timeout(server):
 
 
 @pytest.mark.usefixtures("async_environment")
+@pytest.mark.network
 async def test_connect_timeout(server):
     timeout = httpx.Timeout(None, connect=1e-6)