D3444: tests: comprehensively test exit handling

[durin42 (Augie Fackler)]

durin42 accepted this revision.
durin42 added a comment.
This revision is now accepted and ready to land.


  This LG, esp with https://phab.mercurial-scm.org/D3445 which appears to be its child, but https://phab.mercurial-scm.org/D3445 still needs rebased AFAICT

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D3444

To: indygreg, #hg-reviewers, durin42
Cc: durin42, yuja, mercurial-devel