Chore: Refactor infra/conf.TestToCidrList() (#4017)

infra/conf/dns_test.go

@@ -2,35 +2,15 @@ package conf_test
 
 import (
 	"encoding/json"
-	"os"
-	"path/filepath"
 	"testing"
 
 	"github.com/xtls/xray-core/app/dns"
-	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
-	"github.com/xtls/xray-core/common/platform"
-	"github.com/xtls/xray-core/common/platform/filesystem"
 	. "github.com/xtls/xray-core/infra/conf"
 	"google.golang.org/protobuf/proto"
 )
 
-func init() {
-	wd, err := os.Getwd()
-	common.Must(err)
-
-	if _, err := os.Stat(platform.GetAssetLocation("geoip.dat")); err != nil && os.IsNotExist(err) {
-		common.Must(filesystem.CopyFile(platform.GetAssetLocation("geoip.dat"), filepath.Join(wd, "..", "..", "resources", "geoip.dat")))
-	}
-
-	os.Setenv("xray.location.asset", wd)
-}
-
 func TestDNSConfigParsing(t *testing.T) {
-	defer func() {
-		os.Unsetenv("xray.location.asset")
-	}()
-
 	parserCreator := func() func(string) (proto.Message, error) {
 		return func(s string) (proto.Message, error) {
 			config := new(DNSConfig)