Report Ember.js routing errors in QUnit output

setup.js

// By default errors thrown in route hooks log to the console.
// The router then gracefully transitions to the error substate.
// In tests we’d rather see these errors reported in QUnit’s output.
// Implementing this is easy and here’s how...

// In app/routes/application.js add:

export default Ember.Route.extend({
  actions: {
    error: function(error) {
      if (Ember.onerror) {
        // Pass the error to the global onerror handler
        Ember.onerror(error);
      }
      
      // Allow the event to continue bubbling
      return true;
    }
  }
});

// In tests/test-helper.js add:

Ember.onerror = function(error) {
  QUnit.pushFailure(error.message, error.stack);
}