python3Packages.token-bucket: Disable tests on darwin

pkgs/development/python-modules/token-bucket/default.nix

@@ -1,4 +1,5 @@
 { lib
+, stdenv
 , buildPythonPackage
 , fetchFromGitHub
 , pytest-runner
@@ -25,6 +26,8 @@ buildPythonPackage rec {
     pytestCheckHook
   ];
 
+  doCheck = !stdenv.isDarwin;
+
   meta = with lib; {
     description = "Token Bucket Implementation for Python Web Apps";
     homepage = "https://github.com/falconry/token-bucket";