test_cmp empty result
'
+test_expect_success 'print errors when failed to update worktree' '
+ echo sub >.git/info/sparse-checkout &&
+ git checkout -f init &&
+ mkdir sub &&
+ touch sub/added sub/addedtoo &&
+ test_must_fail git checkout top 2>actual &&
+ cat >expected <<\EOF &&
+error: The following untracked working tree files would be overwritten by checkout:
+ sub/added
+ sub/addedtoo
+Please move or remove them before you can switch branches.
+Aborting
+EOF
+ test_cmp expected actual
+'
+
test_done