Add test for proxy option

tests/test-proxy.js

@@ -0,0 +1,40 @@
+var server = require('./server')
+  , events = require('events')
+  , stream = require('stream')
+  , assert = require('assert')
+  , fs = require('fs')
+  , request = require('../main.js')
+  , path = require('path')
+  , util = require('util')
+  ;
+
+var port = 6768
+  , called = false
+  , proxiedHost = 'google.com'
+  ;
+
+var s = server.createServer(port)
+s.listen(port, function () {
+  s.on('/', function (req, res) {
+    called = true
+    assert.equal(req.headers.host, proxiedHost)
+    res.writeHeader(200)
+    res.end()
+  })
+  console.error('oaneuth')
+  request ({
+    url: 'http://'+proxiedHost,
+    proxy: 'http://localhost:'+port
+    /*
+    //should behave as if these arguments where passed:
+    url: 'http://localhost:'+port,
+    headers: {host: proxiedHost}
+    //*/
+  }, function (err, res, body) {
+    s.close()
+  })
+})
+
+process.on('exit', function () {
+  assert.ok(called, 'the request must be made to the proxy server')
+})