Testing ui.router $stateChangeSuccess

I have a simple function in my main controller that updates $scope.loading based on ui.router's $stateChangeStart and $stateChangeSuccess events.

$scope.$on('$stateChangeStart', function(event, toState) {
  if (toState.resolve) {
    $scope.loading = true;
  }
});
$scope.$on('$stateChangeSuccess', function(event, toState) {
  if (toState.resolve) {
    $scope.loading = false;
  }
});

This works great until I try to unit test. I can't find a way to trigger the $stateChangeSuccess event.

My Jasmine unit test looks something like this:

it('should set $scope.loading to true', function () {
    expect(scope.loading).toBe(false);
    $state.go('home');
    expect(scope.loading).toBe(true);
    scope.$digest();
    expect(scope.loading).toBe(false);

});

The test fails because $stateChangeSuccess never fires. Any ideas would be much appreciated.