test_expect_success 't7900-subtree' '
(
	chks="sub1
sub2
sub3
sub4" &&
	chks_sub=$(cat <<TXT | sed "s,^,sub dir/,"
$chks
TXT
) &&
	chkms="main-sub1
main-sub2
main-sub3
main-sub4" &&
	chkms_sub=$(cat <<TXT | sed "s,^,sub dir/,"
$chkms
TXT
) &&

	subfiles=$(git ls-files) &&
	check_equal "$subfiles" "$chkms
$chks"
)
'