test: try things to reduce flakiness (ChromeDevTools#1879)

Author: OrKoN

scripts/test.mjs

@@ -72,7 +72,7 @@ const nodeArgs = [
   '--test-force-exit',
   '--test-concurrency=1',
   '--test',
-  '--test-timeout=60000',
+  '--test-timeout=120000',
   ...flags,
   ...files,
 ];

tests/server.ts

@@ -95,6 +95,7 @@ export class TestServer {
 
   stop(): Promise<void> {
     return new Promise((res, rej) => {
+      this.#server.closeAllConnections();
       this.#server.close(err => {
         if (err) {
           rej(err);