JCUnit currently does not support a "fault localizer", which identifies failure triggering test input combination(s).
There is a conference paper discussing the automatic fault localization and its framework called "coffee4j".

• https://ieeexplore.ieee.org/document/8728924
• https://github.com/coffee4j/coffee4j