tests: use 'test_must_be_empty' instead of 'test_cmp <empty> <out>'

[git] / templates / info--exclude

# git ls-files --others --exclude-from=.git/info/exclude
# Lines that start with '#' are comments.
# For a project mostly in C, the following would be a good set of
# exclude patterns (uncomment them if you want to use them):
# *.[oa]
# *~