pythonPackages.websocket: disable failing tests on darwin

pkgs/development/python-modules/websockets/default.nix

@@ -3,6 +3,7 @@
 , buildPythonPackage
 , pythonOlder
 , pytest
+, stdenv
 }:
 
 buildPythonPackage rec {
@@ -18,6 +19,9 @@ buildPythonPackage rec {
 
   disabled = pythonOlder "3.3";
 
+  # Tests fail on Darwin with `OSError: AF_UNIX path too long`
+  doCheck = !stdenv.isDarwin;
+
   meta = with lib; {
     description = "WebSocket implementation in Python 3";
     homepage = "https://github.com/aaugustin/websockets";