@list = $git->qx(qw(ls-tree -r --name-only refs/heads/master));
is(scalar @list, 0, 'tree is empty');
@list = $git->qx(qw(rev-list refs/heads/master));
is(scalar @list, 4, 'four revisions in rev-list');
@list = $git->qx(qw(ls-tree -r --name-only refs/heads/master));
is(scalar @list, 0, 'tree is empty');
@list = $git->qx(qw(rev-list refs/heads/master));
is(scalar @list, 4, 'four revisions in rev-list');