Controller Test - get variables defined for ViewModel

gistfile1.php

<?php 

    public function testIfSetsVariablesInRequestABudgetAction()
    {
        $this->createMocks(); // create mocks for services
        $this->dispatch('/en/contact/request-a-budget');
        $this->assertResponseStatusCode(200);
        
        $viewManager = $this->getApplicationServiceLocator()->get('ViewManager');
        $variables   = $viewManager->getViewModel()->getChildren()[0]->getVariables();
        
        $this->assertArrayHasKey('form', $variables);
        $this->assertInstanceOf('Services\Form\RequestABudget', $variables['form']);
        $this->assertArrayHasKey('message', $variables);

    }