cleaner patch/mod exclusion logic

Co-authored-by: Eli Chadwick <eli.chadwick@manchester.ac.uk>

Author: douglowe

tests/shared.py

@@ -104,7 +104,7 @@ def do_entity_test(
     """
     Shared function to test a RO-Crate entity
     """
-    assert sum([bool(rocrate_entity_patch), bool(rocrate_entity_mod_sparql)]) != 2, "Cannot use rocrate_entity_patch and rocrate_entity_mod_sparql together"
+    assert not (rocrate_entity_patch and rocrate_entity_mod_sparql), "Cannot use rocrate_entity_patch and rocrate_entity_mod_sparql together"
 
     # declare variables
     failed_requirements = None