tests: Add test to assert ImmutableValidatedObject raises non-passed key(s)

Author: adisbladis

tests/unit/test_util.py

@@ -83,3 +83,9 @@ def _assign():
             r.x = 2
 
         self.assertRaises(AttributeError, _assign)
+
+        # Fuzz not passed, should raise TypeError
+        class MustRaise(util.ImmutableValidatedObject):
+            fuzz: str
+
+        self.assertRaises(TypeError, lambda: MustRaise())