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    $edit["body[$langcode][0][value]"] = 'Data that should appear only in the body for the node.';

    $edit["body[$langcode][0][summary]"] = 'Extra data that should appear only in the teaser for the node.';

  /**

   * Tests fields that were previously hidden when the view mode is changed.

   */

  function testNodeViewModeChangeHiddenField() {

    // Hide the tags field on the default display

    $instance = field_info_instance('node', 'field_tags', 'article');

    $instance['display']['default']['type'] = 'hidden';

    field_update_instance($instance);

    $web_user = $this->drupalCreateUser(array('create article content', 'edit own article content'));

    $this->drupalLogin($web_user);

    // Create a node.

    $edit = array();

    $langcode = LANGUAGE_NONE;

    $edit["title"] = $this->randomName(8);

    $edit["body[$langcode][0][value]"] = 'Data that should appear only in the body for the node.';

    $edit["body[$langcode][0][summary]"] = 'Extra data that should appear only in the teaser for the node.';

    $edit["field_tags[$langcode]"] = 'Extra tag';

    $this->drupalPost('node/add/article', $edit, t('Save'));

    $node = $this->drupalGetNodeByTitle($edit["title"]);

    // Set the flag to alter the view mode and view the node.

    variable_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');

    // Make sure tags are present.

    $this->assertText('Extra tag', 'Taxonomy term 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.');

  }