test: adjust flaky test which relies on filesystem permissions (#481)

Signed-off-by: Nathan Nguyen <[email protected]>

tests/config/test_defaults.py

@@ -29,7 +29,15 @@ def test_create_defaults() -> None:
     """Test dumping the default values."""
     output_dir = os.path.dirname(os.path.abspath(__file__))
     assert create_defaults(output_dir, global_config.macaron_path) is True
-    assert create_defaults("/", "/") is False
+
+
+@pytest.mark.xfail(
+    os.geteuid() == 0,
+    reason="Only effective for non-root users",
+)
+def test_create_defaults_without_permission() -> None:
+    """Test dumping default config in cases where the user does not have write permission to the output location."""
+    assert create_defaults(output_path="/", cwd_path="/") is False
 
 
 @pytest.mark.parametrize(