The test expects a warning like

   The signer certificate expired on 2019-06-01. However, the JAR will be valid until the timestamp expires on 2026-03-20.

but instead sees

   The timestamp will expire within one year on 2026-03-20.

This is because the tsbefore2019 cert is created with a start date of 2018/1/1 and 3000 valid days, and it expires today.