Skip the pexpect-based unit test on Windows due to the pexpect API being different there

Author: tleonhardt

tests/test_cmd2.py

@@ -1528,6 +1528,8 @@ def test_poutput_none(base_app):
     assert out == expected
 
 
+@pytest.mark.skipif(sys.platform == 'win32',
+                    reason="pexpect doesn't have a spawn() function on Windows")
 def test_persistent_history(request):
     test_dir = os.path.dirname(request.module.__file__)
     persistent_app = os.path.join(test_dir, '..', 'examples', 'persistent_history.py')