[test] Add core `test-http-response-close` test

Modifications:

  * make client connect to `PROXY_PORT` instead of `PORT`

test/core/simple/test-http-response-close.js

+// 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.
+
+var common = require('../common');
+var assert = require('assert');
+var http = require('http');
+
+var gotEnd = false;
+
+var server = http.createServer(function(req, res) {
+  res.writeHead(200);
+  res.write('a');
+
+  req.on('close', function() {
+    console.error('aborted');
+    gotEnd = true;
+  });
+});
+server.listen(common.PORT);
+
+server.on('listening', function() {
+  console.error('make req');
+  http.get({
+    port: common.PROXY_PORT
+  }, function(res) {
+    console.error('got res');
+    res.on('data', function(data) {
+      console.error('destroy res');
+      res.destroy();
+      server.close();
+    });
+  });
+});
+
+process.on('exit', function() {
+  assert.ok(gotEnd);
+});