Integration Test API: Adding CSV Logger to Test Logger

[M Starch]

F´ Version
Affected Component

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Recommendation for adding a csv logger to the TestLogger class:

1. Set up the csv log file in the constructor here.
2. Add a _log_csv_row() helper along similar lines to the _get_ws_row() helper here
3. Log the start time at the top of the file like the excel output does here.
4. Log the column headers to csv like the excel does here.
5. Log messages in the lock block here.