BDAQ Analysis Unit Test is expected to fail

The unit test test_analysis_utils.py subtest test_fit_less_scurves_ana tests fitting S-curve functions with negative threshold values. This fails for the module_qc branch, since fitting negative thresholds was removed as it messes with upload to the ITkPix Production Database. Is there a use-case, for which we want to keep the functionality? Should this test be removed entirely?