How to test component methods?

@okachynskyy wrote:

I have component with one method and service, which can run functions for some components.

export default Ember.Component.extend({
  foo: false,

  bar() {
    this.set('foo', true);
  },

  someService: Ember.inject.service('some-service'),

  didInsertElement: function () {
    const someService = this.get('someService');
    someService.registerComponent(this);
  },
});

---

export default Ember.Service.extend({
  components: [],
  registerComponent: function (component) {
    let components = this.get('components');
    components.push(component);
  },
  runBar(index) {
    let components = this.get('components');
    components[index].bar();
  }
});

1) How can I write tests for bar() method?
2) And also how can I write tests for this service?
3) Or how can I refactor this approach?

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