tests: add test for hg-test-mode emacs code
This is just coverage for the compilation-mode support, but that was
enough of a hassle that I wanted to have it covered somehow. Test
methodology is _extremely_ cargo-culted from the test for
compilation-mode in emacs, so I still have no idea what I'm doing.
Differential Revision: https://phab.mercurial-scm.org/D6003
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing::
$ make local # build for inplace usage
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See https://mercurial-scm.org/ for detailed installation
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