test: using TE to smuggle reqs is not possible

See: https://hackerone.com/reports/735748

PR-URL: nodejs-private/node-private#199
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>

test/parallel/test-http-client-error-rawbytes.js

@@ -19,7 +19,7 @@ server.listen(0, common.mustCall(() => {
   const req = http.get(`http://localhost:${server.address().port}/`);
   req.end();
   req.on('error', common.mustCall((err) => {
-    const reason = 'Content-Length can\'t be present with chunked encoding';
+    const reason = 'Content-Length can\'t be present with Transfer-Encoding';
     assert.strictEqual(err.message, `Parse Error: ${reason}`);
     assert(err.bytesParsed < response.length);
     assert(err.bytesParsed >= response.indexOf('Transfer-Encoding'));

test/parallel/test-http-invalid-te.js

@@ -0,0 +1,40 @@
+'use strict';
+
+const common = require('../common');
+
+// Test https://hackerone.com/reports/735748 is fixed.
+
+const assert = require('assert');
+const http = require('http');
+const net = require('net');
+
+const REQUEST_BB = `POST / HTTP/1.1
+Content-Type: text/plain; charset=utf-8
+Host: hacker.exploit.com
+Connection: keep-alive
+Content-Length: 10
+Transfer-Encoding: chunked, eee
+
+HELLOWORLDPOST / HTTP/1.1
+Content-Type: text/plain; charset=utf-8
+Host: hacker.exploit.com
+Connection: keep-alive
+Content-Length: 28
+
+I AM A SMUGGLED REQUEST!!!
+`;
+
+const server = http.createServer(common.mustNotCall());
+
+server.on('clientError', common.mustCall((err) => {
+  assert.strictEqual(err.code, 'HPE_UNEXPECTED_CONTENT_LENGTH');
+  server.close();
+}));
+
+server.listen(0, common.mustCall(() => {
+  const client = net.connect(
+    server.address().port,
+    common.mustCall(() => {
+      client.end(REQUEST_BB.replace(/\n/g, '\r\n'));
+    }));
+}));