FeatureContext.php

<?php

use Behat\Mink\Driver\GoutteDriver;
use Behat\Mink\Exception\ElementNotFoundException;
use Behat\Mink\Exception\ExpectationException;
use Drupal\DrupalExtension\Context\RawDrupalContext;
use Behat\Behat\Context\SnippetAcceptingContext;

/**
 * Defines application features from the specific context.
 */
class FeatureContext extends RawDrupalContext implements SnippetAcceptingContext {
  /**
   * @Given I wait for the :region region
   */
  public function iWaitForTheRegion($region) {
    $this->spin(function (FeatureContext $context) use ($region) {
      try {
        $session = $this->getSession();
        $region_obj = $session->getPage()->find('region', $region);
        if (!$region_obj) {
          throw new \Exception(sprintf('No region "%s" found on the page %s.', $region, $session->getCurrentUrl()));
        }
        return TRUE;
      }
      catch (\Exception $e) {
        return FALSE;
      }
    });
  }
  /**
   * @Then /^(?:|I )wait to see "(?P<text>(?:[^"]|\\")*)"$/
   */
  public function iWaitToSee($text) {
    $this->spin(function (FeatureContext $context) use ($text) {
      try {
        $this->assertSession()->pageTextContains($text);
        return TRUE;
      }
      catch (ElementNotFoundException $e) {
        return FALSE;
      }
    });
  }
    /**
   * Based on Behat's own example.
   *
   * @see http://docs.behat.org/en/v2.5/cookbook/using_spin_functions.html#adding-a-timeout
   * @param $lambda
   * @param int $wait
   * @throws \Exception
   */
  public function spin($lambda, $wait = 60) {
    $time = time();
    $stopTime = $time + $wait;
    while (time() < $stopTime) {
      try {
        if ($lambda($this)) {
          return;
        }
      }
      catch (\Exception $e) {
        // do nothing.
      }

      usleep(250000);
    }

    throw new \Exception("Spin function timed out after {$wait} seconds");
  }
}