tests/test-issue842.t

run-tests: move test filtering into TestSuite.run()

Upcoming patches will move the execution of tests to separate processes.
To facilitate this, it makes sense to move logic out of Test.
Furthermore, test filtering is logically the domain of the test runner,
not the test itself.

This patch interrupts our mini series of factoring options into named
arguments because filtering consults many options and it is easier to
move this logic out of Test sooner so we don't have to introduce
arguments at all.

http://mercurial.selenic.com/bts/issue842

  $ hg init
  $ echo foo > a
  $ hg ci -Ama
  adding a

  $ hg up -r0000
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

  $ echo bar > a

Should issue new head warning:

  $ hg ci -Amb
  adding a
  created new head

  $ hg up -r0000
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

  $ echo stuffy > a

Should not issue new head warning:

  $ hg ci -q -Amc

  $ hg up -r0000
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

  $ echo crap > a
  $ hg branch testing
  marked working directory as branch testing
  (branches are permanent and global, did you want a bookmark?)

Should not issue warning:

  $ hg ci -q -Amd