How do I test this

conditiontest.php

<?php
//Basic condition should construct the correct widget and properly get its form
$test_widget = new \Drupal\sps\Test\Widget(array(), $manager);
$state = array();
$widget = $test_widget->getPreviewForm(array(), $state);

$state = array();
$element = $condition->getElement(array(), $state);

$this->assertEqual($subelement, $widget,
      'BasicCondition should construct the correct widget from the settings and properly return its form.');