title: KIF can not force app to background
body: <p>I have a problem when app push to background and resume app. 
  When app push to background then it can not force to ground to resume my app
  Here is my code: </p>
  
  <pre><code>   - (void)testResumingEditProfile {
      self.methodName = NSStringFromSelector(_cmd);
  
      user = [TestUser sharedInstance].defaultNextUser;
      user.username = @"347";
      [tester doLoginSuccessfully:user];
  
      app = [UITestApp sharedInstance];
      screen = [tester navigateToOverviewPage];
  
      employee = [[TestEmployee alloc] init].profileEmployee;
  
      [self openEditProfile];
      [tester catpureScreen:[self getCaptureScreenName:@"afterOpenEditProfile"]];
  
      [system deactivateAppForDuration:5]; //Code to deactive and resume app
      [tester catpureScreen:[self getCaptureScreenName:@"afterResumeEditProfile"]];
  
      [tester waitForView:@"text-first-name" in:screen];
      [tester waitForView:@"text-last-name" in:screen];
  
      [tester tap:@"label-show-detail" in:screen];
      [tester catpureScreen:[self getCaptureScreenName:@"afterOpenDetail"]];
  
      [system deactivateAppForDuration:5]; //Code to deactive and resume app
      [tester catpureScreen:[self getCaptureScreenName:@"afterResumeEditProfileDetail"]];
      [tester waitForView:@"label-personal-infomation" in:screen];
      [tester waitForView:@"label-contact-infomation" in:screen];
  }
  </code></pre>
  
  <p>Someone guy please help me to solve this problem. Thanks.</p>