iOS TestCase for method which includes NS Timer

I have a IBAction in my view controller which looks like this

-(IBAction)signUpAction:(id)sender
 {
     AppDelegate *appDel = [[UIApplication sharedApplication]delegate];

    //check for internet Connection
    if(appDel.isReachable)
    {
        //Internet Connection available
        //perform animation od buttons and imagie view
        [self fallDownAnimation];

        //after animation perform model segue to corresponding view controller

        NSTimer* timer =   [NSTimer scheduledTimerWithTimeInterval:0.8f target:self selector:@selector(performRegistrationPageSegue) userInfo:nil repeats:NO];
        [[NSRunLoop mainRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
    }
    else
    {
        //No internet Connection
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:ALERT_VIEW_TITLE message:@"No Internet Connection" delegate:self cancelButtonTitle:nil otherButtonTitles:@"Okay", nil];
        [alert show];
    }
}



-(void)performRegistrationPageSegue{
    [self performSegueWithIdentifier:@"registerVCSegue" sender:self];
}

I want to write a test case on signUpAction method and verify if the Segue is performed. Since it has a timer the test case i have written is failing. I Need a way to test the following condition

My Current Testcase method is

-(void)testRegisterViewControllerSegueOnAvailableInternetConnection{
    AppDelegate *appDel = [[UIApplication sharedApplication]delegate];
    appDel.isReachable = YES;
    id loginMock = [OCMockObject partialMockForObject:_initialViewControllerToTest];

    [[loginMock expect] performSegueWithIdentifier:@"registerVCSegue" sender:[OCMArg any]];

    [loginMock performSelectorOnMainThread:@selector(signUpAction:) withObject:_initialViewControllerToTest.signUpButton waitUntilDone:YES];

    XCTAssert([loginMock verify],@"Segue to Register Page not Performed on Sign Up Click");
}