test: refactor test-http-server-keep-alive-timeout

Make the same reliability changes that were applied to the https test in
ce5745bf92.

Refs: https://github.com/nodejs/node/pull/13312
PR-URL: https://github.com/nodejs/node/pull/13448
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Alexey Orlenko <eaglexrlnk@gmail.com>

test/parallel/test-http-server-keep-alive-timeout.js

@@ -20,24 +20,20 @@ function run() {
 }
 
 test(function serverEndKeepAliveTimeoutWithPipeline(cb) {
-  let socket;
-  let destroyedSockets = 0;
-  let timeoutCount = 0;
   let requestCount = 0;
   process.on('exit', () => {
-    assert.strictEqual(timeoutCount, 1);
     assert.strictEqual(requestCount, 3);
-    assert.strictEqual(destroyedSockets, 1);
   });
   const server = http.createServer((req, res) => {
-    socket = req.socket;
     requestCount++;
     res.end();
   });
-  server.setTimeout(200, (socket) => {
-    timeoutCount++;
+  server.setTimeout(500, common.mustCall((socket) => {
+    // End this test and call `run()` for the next test (if any).
     socket.destroy();
-  });
+    server.close();
+    cb();
+  }));
   server.keepAliveTimeout = 50;
   server.listen(0, common.mustCall(() => {
     const options = {
@@ -49,32 +45,23 @@ test(function serverEndKeepAliveTimeoutWithPipeline(cb) {
       c.write('GET /2 HTTP/1.1\r\nHost: localhost\r\n\r\n');
       c.write('GET /3 HTTP/1.1\r\nHost: localhost\r\n\r\n');
     });
-    setTimeout(() => {
-      server.close();
-      if (socket.destroyed) destroyedSockets++;
-      cb();
-    }, 1000);
   }));
 });
 
 test(function serverNoEndKeepAliveTimeoutWithPipeline(cb) {
-  let socket;
-  let destroyedSockets = 0;
-  let timeoutCount = 0;
   let requestCount = 0;
   process.on('exit', () => {
-    assert.strictEqual(timeoutCount, 1);
     assert.strictEqual(requestCount, 3);
-    assert.strictEqual(destroyedSockets, 1);
   });
   const server = http.createServer((req, res) => {
-    socket = req.socket;
     requestCount++;
   });
-  server.setTimeout(200, (socket) => {
-    timeoutCount++;
+  server.setTimeout(500, common.mustCall((socket) => {
+    // End this test and call `run()` for the next test (if any).
     socket.destroy();
-  });
+    server.close();
+    cb();
+  }));
   server.keepAliveTimeout = 50;
   server.listen(0, common.mustCall(() => {
     const options = {
@@ -86,10 +73,5 @@ test(function serverNoEndKeepAliveTimeoutWithPipeline(cb) {
       c.write('GET /2 HTTP/1.1\r\nHost: localhost\r\n\r\n');
       c.write('GET /3 HTTP/1.1\r\nHost: localhost\r\n\r\n');
     });
-    setTimeout(() => {
-      server.close();
-      if (socket.destroyed) destroyedSockets++;
-      cb();
-    }, 1000);
   }));
 });