$this->drupalGet('admin/structure/views/nojs/display/test_page_display_menu/page_5/menu');
$this->assertResponse(200);
$menu_parent = $this->xpath('//select[@id="edit-menu-parent"]');
$this->drupalGet('admin/structure/views/nojs/display/test_page_display_menu/page_5/menu');
$this->assertResponse(200);
$menu_parent = $this->xpath('//select[@id="edit-menu-parent"]');