Aurelia Testing Components with <compose>

Question

I am trying to test the component of the dialog box that will be used with aurelia-dialog, which gets property bindings through a method activate(). To test the component, I configure the tests with an element <compose>that also uses the method activate()as follows:

beforeEach(() => {
  component = StageComponent
    .withResources('path/to/dialogComponent')
    .inView(`<compose view-model="path/to/dialogComponent" model.bind="mockModel">
             </compose>`)
    .boundTo(mockModel);
});

However, when I come to check the view model for related properties, I get zero where the actual view model was used before.

describe('#someComponentMethod()', () => {
  it('Should exist', done => {
    // In the past, I succesfully accessed child viewModels for
    // compose through the following property, after a general package update, 
    // this seems not to work anymore
    let viewModel = component.viewModel.currentViewModel

    expect(viewModel.someComponentMethod).toBeDefined(); 
    // ==> Runtime error, since currentViewModel === null

    done();
  });
});

Is there a known or better way to test custom elements that do not have binding properties but rely on a model that needs to be bound activate()?

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