How to determine if OnsenUI component is compiled in unit test

My project is built with vue-cordova-webpack template. I created a vue-component. There is v-ons-input inside the template of my component. I need to change the value of v-ons-input during the unit test of my component. I can do it only after ons-input is compiled, because only after compilation ons-input has input inside (see about OnsenUI component compilation). The problem is a compilation is executed asynchronously and I didn't find any "legit" way to catch the event when OnsenUI component is ready for use.

What do I do? I created a sinon spy for an internal method _compile of the ons-input and wait until it's been called:

it('test', (done) => {
   const wrapper = mount(myVueComponent)

   // here I can't set a value for ons-input

   var spy = sinon.spy(wrapper.find('ons-input').element, '_compile')

   function waitForCall(spy) {
     return new Promise(function (resolve, reject) {
       (function wait() {
         if (spy.called) {
           return resolve()
         }
         setTimeout(wait, 10)
       })()
     })
   }

   waitForCall(spy).then(function () {
     // now ons-input is compiled and I can set a value for ons-input
     wrapper.find('ons-input').element.value = 'foo'
     ...
   }).then(done, done)
 })

Is there more "clean" way to determine that OnsenUI component is ready for use in a unit test (without manipulation with internal methods of the component)?

P.S. I know the way not for test environment - listening for init event for document(see here), but it doesn't work in unit tests.

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