fix failing unit test src/execution_testing/test_types/tests/test_types.py::test_model_copy[Environment]

Author: felix314159

packages/testing/src/execution_testing/base_types/pydantic.py

@@ -31,8 +31,20 @@ class CopyValidateModel(EthereumTestBaseModel):
     def copy(self: Self, **kwargs: Any) -> Self:
         """
         Create a copy of the model with the updated fields that are validated.
+
+        This method preserves the actual field values (including those set via
+        default_factory) while maintaining the model_fields_set to track which
+        fields were explicitly set.
         """
-        return self.__class__(**(self.model_dump(exclude_unset=True) | kwargs))
+        # Get all current field values, including those set via default_factory
+        dump_dict = self.model_dump()
+        # Merge with the updates
+        dump_dict.update(kwargs)
+        # Create the new instance
+        new_instance = self.__class__(**dump_dict)
+        # Preserve the original model_fields_set, adding any new kwargs
+        new_instance.__pydantic_fields_set__ = self.model_fields_set | kwargs.keys()
+        return new_instance
 
 
 class CamelModel(CopyValidateModel):