test_add_delta() {
	local new_savedir="$TMP_DIR/new_savedir"
	local config_delta="$CONFIG_DIR/delta"

	# add normal changes
	touch "$config_delta"
	$UCI set delta.sec0=sectype
	$UCI add_list delta.sec0.li0=0

	# save new changes in "$new_savedir"
	mkdir -p "$new_savedir"
	touch "$new_savedir/delta"
	$UCI -P "$new_savedir" set delta.sec0=sectype
	$UCI -P "$new_savedir" add_list delta.sec0.li0=1

	assertEquals "delta.sec0='sectype'
delta.sec0.li0+='0'" "$($UCI changes)"

	# check combined changes.  order matters here.
	assertEquals "delta.sec0='sectype'
delta.sec0.li0+='1'
delta.sec0='sectype'
delta.sec0.li0+='0'" "$($UCI -P "$new_savedir" changes)"

	# check CLI_FLAG_NOCOMMIT with -P option.
	$UCI -P "$new_savedir" commit
	assertTrue "$?"
	assertEquals "" "$(cat $config_delta)"

	# check normal commit.
	$UCI -p "$new_savedir" commit
	assertTrue "$?"
	assertSameFile "$REF_DIR/options.delta.result" "$config_delta"

	rm -rf "$new_savedir"
	rm -f "$config_delta"
}