FIX: compare_entities was not written for properties. raise error

Summary

#121 (closed) Remove xfail of test. This fixes two things:

• use 'importance' in the test correctly and test it correctly
• add 'value' to SPECIAL_PROPERTIES list such that it is also compared

Test Environment

pipelines

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src/linkahead/apiutils.py

@@ -215,6 +215,9 @@ def compare_entities(old_entity: Entity, new_entity: Entity, compare_referenced_
     if old_entity is new_entity:
         return (olddiff, newdiff)
 
+    if (isinstance(old_entity, Property) or isinstance(old_entity, Property)):
+        raise NotImplementedError("Comparing Properties is currently not supported.")
+
     for attr in SPECIAL_ATTRIBUTES:
         try:
             oldattr = old_entity.__getattribute__(attr)
@@ -246,7 +249,6 @@ def compare_entities(old_entity: Entity, new_entity: Entity, compare_referenced_
                 newdiff[attr] = newattr
 
     # properties
-
     for prop in old_entity.properties:
         matching = [p for p in new_entity.properties if p.name == prop.name]