python3Packages.essentials: disable broken tests on darwin

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

···
   fetchFromGitHub,
   setuptools,
   pytestCheckHook,
+  stdenv,
   lib,
 }:
 buildPythonPackage rec {
···
   nativeBuildInputs = [ setuptools ];
 
   nativeCheckInputs = [ pytestCheckHook ];
+
+  disabledTests = lib.optionals stdenv.hostPlatform.isDarwin [
+    # time.sleep(0.01) can be up to 0.05s on darwin
+    "test_stopwatch"
+    "test_stopwatch_with_context_manager"
+  ];
 
   pythonImportsCheck = [ "essentials" ];