test_cmp expect actual
'
+test_expect_success 'Prune empty commits' '
+ git rev-list HEAD > expect &&
+ make_commit to_remove &&
+ git filter-branch -f --index-filter "git update-index --remove to_remove" --prune-empty HEAD &&
+ git rev-list HEAD > actual &&
+ test_cmp expect actual
+'
+
test_done