Club Drupal

  /**

   * Test that an invalid source image returns a 404.

   */

  function testImageStyleUrlForMissingSourceImage() {

    $non_existent_uri = 'public://foo.png';

    $generated_url = image_style_url($this->style_name, $non_existent_uri);

    $this->drupalGet($generated_url);

    $this->assertResponse(404, 'Accessing an image style URL with a source image that does not exist provides a 404 error response.');

  }