test: test requests with Unicode in the URL

This test currently fails. It illustrates that Unicode in the URL does
not arrive intact to the server, there is silent data corruption along
the way at some point.

This test is for the issue nodejs#13296.

test/parallel/test-http-path-contains-unicode.js

@@ -0,0 +1,64 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+'use strict';
+require('../common');
+const assert = require('assert');
+const http = require('http');
+
+const expected = '/café🐶';
+let result = '';
+
+assert.strictEqual(
+ expected,
+ '/caf\u{e9}\u{1f436}',
+ 'Sanity check that string literal produced the expected string'
+);
+
+const server = http.Server(function(req, res) {
+  result = req.url;
+  req.on('data', function() {
+  }).on('end', function() {
+    server.close();
+    res.writeHead(200);
+    res.end('hello world\n');
+  });
+
+});
+
+server.listen(0, function() {
+  http.request({
+    port: this.address().port,
+    path: expected,
+    method: 'GET'
+  }, function(res) {
+    console.log(res.statusCode);
+    res.resume();
+  }).on('error', function(e) {
+    console.log(e.message);
+    process.exit(1);
+  }).end();
+});
+
+process.on('exit', function() {
+  assert.strictEqual(expected, result);
+});