tools: Testing should not begin until element fixtures are ready.

I have an element that goes through some startup steps but the test environment initiates the test before the element has finished setting up. I ran into this error when the setup was done in a created callback. Currently, I’m attempting to performing the setup in an anonymous function that sets a parameter’s default value:

client: {
        type: Object,
        value: function(){
          //do suff
          return object;
        }
      }

Ideally, testing should not begin until the elements have been fully constructed. I’m not sure if there is a nice event we can watch for, but perhaps we could wait until 100ms after the ready function has been called?