tests/test-check-jshint.t

phabricator: add debug logging to show previous node values in `phabsend`

This isn't real useful here, but was very useful showing how `phabsend --fold`
handles commits created by `hg fold` and `hg split`.  It introduces a new debug
function and flag instead of using `ui.debug()`, because `--debug` prints out
all of the API chatter.

Differential Revision: https://phab.mercurial-scm.org/D8389

#require test-repo jshint hg10

  $ . "$TESTDIR/helpers-testrepo.sh"

run jshint on all tracked files ending in .js except vendored dependencies

  $ cd "`dirname "$TESTDIR"`"

  $ testrepohg locate 'set:**.js' \
  > 2>/dev/null \
  > | xargs jshint