test_must_fail git merge @{-100}
'
+test_expect_success 'log -g @{-1}' '
+ git checkout -b last_branch &&
+ git checkout -b new_branch &&
+ echo "last_branch@{0}" >expect &&
+ git log -g --format=%gd @{-1} >actual &&
+ test_cmp expect actual
+'
+
test_done