tests: add test showing that paths outside narrowspec are not added
We had a test that shows that trying to explicitly add a file outside
the narrowspec results in an error, but we didn't have a test that
shows that paths from subdirectories outside the narrowspec are not
added (on e.g. `hg add .`) but silently ignored.
Differential Revision: https://phab.mercurial-scm.org/D4822
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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