Behat: Custom step to test clicking on an element with a class

gistfile1.txt

/**
   * Clicks on a css element.
   *
   * @Given I click the :arg1 element
   */
  public function iClickTheElement($selector) {
    $page = $this->getSession()->getPage();
    $element = $page->find('css', $selector);

    if (empty($element)) {
      throw new Exception("No html element found for the selector ('$selector')");
    }

    $element->click();
  }