chore(internal): make test_proxy_environment_variables more resilient

Author: stainless-app[bot]

tests/test_client.py

@@ -955,6 +955,8 @@ def retry_handler(_request: httpx.Request) -> httpx.Response:
     def test_proxy_environment_variables(self, monkeypatch: pytest.MonkeyPatch) -> None:
         # Test that the proxy environment variables are set correctly
         monkeypatch.setenv("HTTPS_PROXY", "https://example.org")
+        # Delete in case our environment has this set
+        monkeypatch.delenv("HTTP_PROXY", raising=False)
 
         client = DefaultHttpxClient()
 
@@ -1912,6 +1914,8 @@ async def test_main() -> None:
     async def test_proxy_environment_variables(self, monkeypatch: pytest.MonkeyPatch) -> None:
         # Test that the proxy environment variables are set correctly
         monkeypatch.setenv("HTTPS_PROXY", "https://example.org")
+        # Delete in case our environment has this set
+        monkeypatch.delenv("HTTP_PROXY", raising=False)
 
         client = DefaultAsyncHttpxClient()