When pre-image deletion tests fail, too little relevant information is shown in the logs to diagnose the nature of the issue:

•  assert.soons should include additional information in the error message, and this should be a function, in case the information can change over time
• change stream pre-image deletion job logs should use the "QUERY" component (currently it is "-")
• the dedicated tests should activate the matching verbosity level
• forcing the oplog roll-over should be simplified in the tests