Fix validator info csv: Add explicit seek for StringIO

src/pvframework/execution.py

@@ -10,7 +10,7 @@
 from dataclasses import dataclass
 from datetime import timedelta
 from enum import IntEnum, StrEnum
-from io import StringIO
+from io import SEEK_END, StringIO
 from typing import Generic, Iterable, Iterator, Optional
 
 import networkx as nx
@@ -167,6 +167,7 @@ def get_csv_formatted_validator_infos(
         """
         if initial_value is None or isinstance(initial_value, str):
             output = StringIO(initial_value=initial_value)
+            output.seek(0, SEEK_END)
         else:
             output = initial_value
         csv_writer = csv.writer(output)

unittests/test_validation.py

@@ -555,12 +555,23 @@ def test_validator_info_table(self):
 
         csv_table = validation_manager.get_csv_formatted_validator_infos()
 
+        validation_manager2 = ValidationManager[DataSetTest](manager_id="TestValidationManager2")
+        validation_manager2.register(PathMappedValidator(validator_check_y_positive, {"y": "y"}))
+        validation_manager2.register(
+            PathMappedValidator(validator_check_required_and_optional_with_utility, {"z": "z"}),
+            mode=ValidationMode.WARNING,
+        )
+
+        csv_table = validation_manager.get_csv_formatted_validator_infos()
+        csv_table = validation_manager2.get_csv_formatted_validator_infos(headings=None, initial_value=csv_table)
+
         assert isinstance(csv_table, str)
         assert (
             "Just a heavy task to validate x.\\n"
             "This docstring is used to test the output of the csv renderer of the ValidationManager."
         ) in csv_table
         assert "TestValidationManager" in csv_table
+        assert "TestValidationManager2" in csv_table
         assert "check_x_expensive" in csv_table
         assert ValidationMode.ERROR.value in csv_table
         assert ValidationMode.WARNING.value in csv_table