CKEditor fill in field in a Behat step definition

FeaturesContext.php

  /**
   * @Then I fill in wysiwyg on field :locator with :value
   */
  public function iFillInWysiwygOnFieldWith($locator, $value) {
    $el = $this->getSession()->getPage()->findField($locator);

    if (empty($el)) {
      throw new ExpectationException('Could not find WYSIWYG with locator: ' . $locator, $this->getSession());
    }

    $fieldId = $el->getAttribute('id');

    if (empty($fieldId)) {
      throw new Exception('Could not find an id for field with locator: ' . $locator);
    }

    $this->getSession()
      ->executeScript("CKEDITOR.instances[\"$fieldId\"].setData(\"$value\");");
  }

Thanks a lot ! Still useful 6 years later