tests: add more tests for "hg shelve --delete"...
tests: add more tests for "hg shelve --delete"
It appears that the only tests for "hg shelve --delete" concern command
errors (e.g. incompatible command options). Adding some more to check
that non-existent names are handled and a success case.
Differential Revision:
https://phab.mercurial-scm.org/D7460