feat: add the option to add an error to an ActivityResult

Author: Marvin Schenkel

src/data_factory_testing_framework/_pythonnet/data_factory_testing_framework_expressions_evaluator.py

@@ -42,6 +42,7 @@ def evaluate(expression: str, state: PipelineRunState) -> Union[str, int, float,
                     "body": {
                         "output": activity.output,
                         "status": activity.status,
+                        "error": activity.error,
                     }
                 }
             }

src/data_factory_testing_framework/state/_activity_result.py

@@ -9,17 +9,20 @@ def __init__(
         activity_name: str,
         status: Optional[DependencyCondition] = None,
         output: Optional[Any] = None,  # noqa: ANN401
+        error: Optional[Any] = None,  # noqa: ANN401
     ) -> None:
         """Represents the result of an activity.
 
         Args:
             activity_name: Name of the activity.
             status: Status of the activity.
             output: Output of the activity. (e.g. { "count": 1 } for activity('activityName').output.count)
+            error: Error of the activity. (e.g. { "code": "ErrorCode", "message": "ErrorMessage" } for activity('activityName').Error)
         """
         self.activity_name = activity_name
         self.status = status if status is not None else DependencyCondition.SUCCEEDED
         self.output = output
+        self.error = error
 
     def __getitem__(self, item: str) -> Any:  # noqa: ANN401
         return getattr(self, item)