Test renaming built-in menu.
function testSystemMenuRename() {
$this
->drupalLogin($this->big_user);
$edit = array(
'label' => $this
->randomName(16),
);
$this
->drupalPost('admin/structure/menu/manage/main/edit', $edit, t('Save'));
// Make sure menu shows up with new name in block addition.
$default_theme = variable_get('theme_default', 'stark');
$this
->drupalget('admin/structure/block/list/block_plugin_ui:' . $default_theme . '/add');
$this
->assertText($edit['label']);
}