TST: added an xfail to a new failing test

unittests/test_macros.py

@@ -300,7 +300,10 @@ extroot: !macro
     assert d["macro_sub_98"]["b"] == "98"
     assert d["macro_sub_98"]["another_param"] == 3
 
-
+@pytest.mark.xfail(
+    reason="This is discussed in the following issue"
+    "https://gitlab.com/caosdb/caosdb-crawler/-/issues/74."
+)
 def test_silent_overwrite(register_macros, macro_store_reset):
     cfood = _temp_file_load("""
 ---