use caplog_level for validation in testing framework

Author: lukaspie

src/pynxtools/testing/nexus_conversion.py

@@ -165,7 +165,8 @@ def convert_to_nexus(
         assert test_output == []
 
         # Validate created file using the validate_nexus functionality
-        validate(self.created_nexus, ignore_undocumented=ignore_undocumented)
+        with self.caplog.at_level(caplog_level):
+            validate(self.created_nexus, ignore_undocumented=ignore_undocumented)
 
         if NOMAD_AVAILABLE:
             kwargs = dict(