AsyncTest.swift

import XCTest

class AsyncTests: XCTestCase {
    
    func testExample() {
        //set expectaton
        let expectation = expectationWithDescription("Swift Expectations")
        let url = NSURL(string: "http://www.stackoverflow.com")
        let request = NSURLRequest(URL: url!)
        NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue()) {
            (response, data, error) in
                let page = NSString(data: data!, encoding: NSUTF8StringEncoding)
                XCTAssertTrue(page!.containsString(">Stack Overflow<"))
                //fulfill expectation
                expectation.fulfill()
        }
        //wait
        waitForExpectationsWithTimeout(5.0, handler:nil)
    }
}