checking karma rootScope.$on event for successfully changing location

In my code snippet, I have a simple function that reloads the current window when $locationChangeSuccess occurs:

$rootScope.$on('$locationChangeSuccess', function(){
    self.window.location.reload();
});

I am looking to test this function using karma. My initial approach was as follows:

beforeEach(inject(function($rootScope) {
    rootScope = $rootScope;
}));


it('should reload the window if the URL changes', function() {
    spyOn(rootScope, '$on');
    rootScope.$broadcast('$locationChangeSuccess');
    expect(rootScope.$on).toHaveBeenCalled();
});

I have also attempted using $emit instead of $broadcast, but encountered the same outcome. Does anyone have suggestions on how to make this work?

javascriptangularjskarma-jasmine

Answer №1

One key aspect of Angular that you might have overlooked is the $digest cycle. It's crucial to keep in mind for future reference, especially when writing unit tests. Whenever there's a need to update a model and expect some action or event to be triggered, running $digest becomes essential. The same principle applies when utilizing $compile in unit tests for testing directives. Any time you anticipate Angular to perform tasks automatically, remember to use either scope$digest() or rootScope.$digest().

beforeEach(inject(function($rootScope) {
  rootScope = $rootScope;
}));

it('should trigger a window reload upon URL change', function() {
  spyOn(rootScope, '$on');
  rootScope.$broadcast('$locationChangeSuccess');
  rootScope.$digest();
  expect(rootScope.$on).toHaveBeenCalled();
});

This approach works effectively because the digest cycle ensures proper processing of the broadcast event.

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