class NodeEntityViewModeAlterTest

class NodeEntityViewModeAlterTest extends NodeTestBase {

  /**
   * Enable dummy module that implements hook_node_view().
   */
  public static $modules = array(
    'node_test',
  );
  public static function getInfo() {
    return array(
      'name' => 'Node entity view mode',
      'description' => 'Test changing view mode.',
      'group' => 'Node',
    );
  }

  /**
   * Create a "Basic page" node and verify its consistency in the database.
   */
  function testNodeViewModeChange() {
    $web_user = $this
      ->drupalCreateUser(array(
      'create page content',
      'edit own page content',
    ));
    $this
      ->drupalLogin($web_user);

    // Create a node.
    $edit = array();
    $langcode = Language::LANGCODE_NOT_SPECIFIED;
    $edit["title"] = $this
      ->randomName(8);
    $edit["body[{$langcode}][0][value]"] = t('Data that should appear only in the body for the node.');
    $edit["body[{$langcode}][0][summary]"] = t('Extra data that should appear only in the teaser for the node.');
    $this
      ->drupalPost('node/add/page', $edit, t('Save'));
    $node = $this
      ->drupalGetNodeByTitle($edit["title"]);

    // Set the flag to alter the view mode and view the node.
    \Drupal::state()
      ->set('node_test_change_view_mode', 'teaser');
    $this
      ->drupalGet('node/' . $node->nid);

    // Check that teaser mode is viewed.
    $this
      ->assertText('Extra data that should appear only in the teaser for the node.', 'Teaser text present');

    // Make sure body text is not present.
    $this
      ->assertNoText('Data that should appear only in the body for the node.', 'Body text not present');

    // Test that the correct build mode has been set.
    $build = node_view($node);
    $this
      ->assertEqual($build['#view_mode'], 'teaser', 'The view mode has correctly been set to teaser.');
  }

}