python3Packages.agate: disable test on darwin that fails due to differences in locale rendering

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

@@ -1,5 +1,6 @@
 {
   lib,
+  stdenv,
   babel,
   buildPythonPackage,
   cssselect,
@@ -22,8 +23,6 @@ buildPythonPackage rec {
   version = "1.14.0";
   pyproject = true;
 
-  disabled = pythonOlder "3.8";
-
   src = fetchFromGitHub {
     owner = "wireservice";
     repo = "agate";
@@ -50,6 +49,11 @@ buildPythonPackage rec {
     pytestCheckHook
   ];
 
+  disabledTests = lib.optionals stdenv.isDarwin [
+    # Output is slightly different on macOS
+    "test_cast_format_locale"
+  ];
+
   pythonImportsCheck = [ "agate" ];
 
   meta = {