make sure we use ipv4 first lookup for testing because we start server on 127.0.0.1

Author: Apollon77

test/01_proxy.ts

@@ -7,7 +7,8 @@ import http from "http";
 import net from "net";
 import nodeStatic from "node-static";
 import WebSocket from "ws";
-import { Proxy } from "../lib/proxy";
+import { Proxy } from "../";
+import dns from "dns";
 
 const fileStaticA = new nodeStatic.Server(`${__dirname}/wwwA`);
 const fileStaticB = new nodeStatic.Server(`${__dirname}/wwwB`);
@@ -19,6 +20,10 @@ const testWSPort = 40007;
 const testUrlA = `http://${testHost}:${testPortA}`;
 const testUrlB = `http://${testHost}:${testPortB}`;
 
+if (typeof dns.setDefaultResultOrder === "function") {
+  dns.setDefaultResultOrder("ipv4first");
+}
+
 const getHttp = (url, cb) => {
   request({ url }, (err, resp, body) => {
     cb(err, resp, body);