Trying out the Angular resolve feature

I am utilizing Angular with ui-router, so the toResolve variable will be resolved in my SomeController.

.state('some.state', {
      url: '/some',
      controller: 'SomeController',
      templateUrl: '/static/views/some-state.html',
      resolve: {
        toResolve: function(Resource) {
          return Resource.get(function(response) {
            return response;
          });
        },

However, I am facing a challenge on how to effectively test this functionality using Jasmine. In a hypothetical scenario where I omit the return statement, the toResolve within my scope would then become undefined.

Answer №1

To ensure efficient testing of resolvers, utilize services to make them easily testable and mockable, especially in integration and end-to-end tests.

Keep in mind that Angular services are singletons while state/route resolvers are not.

If you anticipate the need to cache a resolution, consider moving the resolver to a factory service.

app.factory('someResolver', function(Resource) {
  return Resource.get(function(response) {
    return response;
  })
});
...

resolve: { toResolve: 'someResolver' },

However, if the resolver is expected to be reevaluated on every route change, this could potentially cause unwanted behavior in your application. In such cases, using a constant annotated function may be more appropriate:

app.constant('someResolver', ['Resource', function(Resource) {
  return Resource.get(function(response) {
    return response;
  })
}]);

app.config(function (someResolver, ...) {
  ...
  resolve: { toResolve: someResolver },
  ...

Otherwise, you might find yourself with excessive boilerplate code cluttering your specs:

var toResolveFactory = $state.get('some.state').resolve.toResolve;
var toResolve = $injector.invoke(toResolveFactory);

Answer №2

If you're looking for more information on a related topic, I found a great article at . However, it's important to note that this is not the ultimate solution. One approach could be passing another object to resolve and then testing that specific unit of code separately, especially useful when dealing with multiple items being resolved.

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