test: check types for http request and response

test/parallel/test-http-same-map.js

@@ -0,0 +1,55 @@
+// Flags: --allow_natives_syntax
+'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+const http = require('http');
+
+const server =
+    http.createServer(onrequest).listen(0, common.localhostIPv4, () => next(0));
+
+function onrequest(req, res) {
+  res.end('ok');
+  onrequest.requests.push(req);
+  onrequest.responses.push(res);
+}
+onrequest.requests = [];
+onrequest.responses = [];
+
+function next(n) {
+  const { address: host, port } = server.address();
+  const req = http.get({ host, port });
+  req.once('response', (res) => onresponse(n, req, res));
+}
+
+function onresponse(n, req, res) {
+  res.resume();
+
+  if (n < 3) {
+    res.once('end', () => next(n + 1));
+  } else {
+    server.close();
+  }
+
+  onresponse.requests.push(req);
+  onresponse.responses.push(res);
+}
+onresponse.requests = [];
+onresponse.responses = [];
+
+function allSame(list) {
+  assert(list.length >= 2);
+  // Use |elt| in no-op position to pacify eslint.
+  for (const elt of list) elt, eval('%DebugPrint(elt)');
+  for (const elt of list) elt, assert(eval('%HaveSameMap(list[0], elt)'));
+}
+
+process.on('exit', () => {
+  eval('%CollectGarbage(0)');
+  // TODO(bnoordhuis) Investigate why the first IncomingMessage ends up
+  // with a deprecated map.  The map is stable after the first request.
+  allSame(onrequest.requests.slice(1));
+  allSame(onrequest.responses);
+  allSame(onresponse.requests);
+  allSame(onresponse.responses);
+});