Unit test for asynchronous code

I have got some code, which is using HttpWebRequest class's .BeginGetResponse() method and it is asynchronous. Also, I am using Microsoft's Unit Test App project for testing application.

The problem is that test framework does not waiting for end of running asynchronous code, so I can not check its result.

How should I test asynchronous code using Unit Test App project? I'm not using async/await modificators.