public function test_filter_wp_nav_menu_args() {
    do_action( 'customize_register', $this->wp_customize );
    $menus   = $this->wp_customize->nav_menus;
    $menu_id = wp_create_nav_menu( 'Foo' );

    $results = $menus->filter_wp_nav_menu_args(
      array(
        'echo'        => true,
        'fallback_cb' => 'wp_page_menu',
        'walker'      => '',
        'menu'        => $menu_id,
        'items_wrap'  => '<ul id="%1$s" class="%2$s">%3$s</ul>',
      )
    );
    $this->assertArrayHasKey( 'customize_preview_nav_menus_args', $results );
    $this->assertTrue( $results['can_partial_refresh'] );

    $results = $menus->filter_wp_nav_menu_args(
      array(
        'echo'        => false,
        'fallback_cb' => 'wp_page_menu',
        'walker'      => new Walker_Nav_Menu(),
        'items_wrap'  => '<ul id="%1$s" class="%2$s">%3$s</ul>',
      )
    );
    $this->assertFalse( $results['can_partial_refresh'] );
    $this->assertArrayHasKey( 'customize_preview_nav_menus_args', $results );
    $this->assertSame( 'wp_page_menu', $results['fallback_cb'] );

    $nav_menu_term = get_term( wp_create_nav_menu( 'Bar' ) );
    $results       = $menus->filter_wp_nav_menu_args(
      array(
        'echo'        => true,
        'fallback_cb' => 'wp_page_menu',
        'walker'      => '',
        'menu'        => $nav_menu_term,
        'items_wrap'  => '<ul id="%1$s" class="%2$s">%3$s</ul>',
      )
    );
    $this->assertTrue( $results['can_partial_refresh'] );
    $this->assertArrayHasKey( 'customize_preview_nav_menus_args', $results );
    $this->assertSame( $nav_menu_term->term_id, $results['customize_preview_nav_menus_args']['menu'] );

    $results = $menus->filter_wp_nav_menu_args(
      array(
        'echo'        => true,
        'fallback_cb' => 'wp_page_menu',
        'walker'      => '',
        'menu'        => $menu_id,
        'container'   => 'div',
        'items_wrap'  => '%3$s',
      )
    );
    $this->assertTrue( $results['can_partial_refresh'] );

    $results = $menus->filter_wp_nav_menu_args(
      array(
        'echo'        => true,
        'fallback_cb' => 'wp_page_menu',
        'walker'      => '',
        'menu'        => $menu_id,
        'container'   => false,
        'items_wrap'  => '<ul id="%1$s" class="%2$s">%3$s</ul>',
      )
    );
    $this->assertTrue( $results['can_partial_refresh'] );

    $results = $menus->filter_wp_nav_menu_args(
      array(
        'echo'        => true,
        'fallback_cb' => 'wp_page_menu',
        'walker'      => '',
        'menu'        => $menu_id,
        'container'   => false,
        'items_wrap'  => '%3$s',
      )
    );
    $this->assertFalse( $results['can_partial_refresh'] );
  }