Intern ajax testing with node.js

I'm using intern with node.js, trying to set up intern for ajax testing. The server code below serves direct GET requests, but XHR request by Intern doesn't seem to reach to it. I suspect the problem is something to do with proxyUrl setup for the Node.

server/main.js: Node/express

...

app.get('/data', function(request, response, next){
if(request.xhr)
{
    var data = dfs.readFileSync("src/server/data.json");
    response.render(data, {
        root: root,
        error: new Error('Cant read file')
});
}
else
    next();
});

...

app.listen(8001);

http_proxy.createServer(function(req,res, proxy){
    proxy.proxyRequest(req,res, {host:'localhost', port:8001});
}).listen(9000);

intern.hello.js: (unit test code)

...

'async test': function () {
    var dfd = this.async(1000);

    request('/data').then(dfd.callback(function (data) {
        assert.strictEqual(data, 'hello world');
    }, dfd.reject.bind(dfd)));
}

intern config:

...
proxyPort:9000,
proxyUrl: 'http://localhost:8001/',
...

intern error:

Warning: FAIL: async test (1015ms)
Error: Timeout reached on main - wait - async test
    at Error (<anonymous>)
    at new ErrorCtor (.../node_modules/intern/node_modules/dojo/errors/create.js:13:21)
    at null._onTimeout (.../node_modules/intern/lib/Test.js:164:21)
    at Timer.listOnTimeout [as ontimeout] (timers.js:110:15)
2/3 tests passed
2/3 tests passed Use --force to continue.