tests: make test-convert-git.t reproducible
For reasons I can't explain, Git's copy detection code was identifying
different source files on OS X and (presumably) Solaris versus Linux
(which the test was originally authored against). This was causing
unstable test output.
Changing the test to use a non-ambiguous source file appears to make
the test stable.
The test was introduced recently in ea3540e66fd8.
$ hg init
$ touch unknown
$ touch a
$ hg add a
$ hg ci -m "1"
$ touch b
$ hg add b
$ hg ci -m "2"
Should show unknown
$ hg status
? unknown
$ hg revert -r 0 --all
removing b
Should show unknown and b removed
$ hg status
R b
? unknown
Should show a and unknown
$ ls
a
unknown