Add and extend unit tests#7694

Merged

calixtus merged 2 commits intoJabRef:mainfrom

ningxie1991:a4-df

May 3, 2021

Commits on May 1, 2021

cover boundary cases & add more unit tests
Davfon
committed

Commits on May 3, 2021

Merge remote-tracking branch 'upstream/main' into a4-df
Davfon
committed