t / t4013 / diff.diff-tree_--cc_--shortstat_masteron commit t2027: use test_must_be_empty (bcba406)
   1$ git diff-tree --cc --shortstat master
   259d314ad6f356dd08601a4cd5e530381da3e3c64
   3 2 files changed, 5 insertions(+)
   4$