public function test_save_nav_menus_created_posts() {
    $menus = new WP_Customize_Nav_Menus( $this->wp_customize );
    do_action( 'customize_register', $this->wp_customize );

    $post_ids = array();

    // Auto-draft.
    $r = $menus->insert_auto_draft_post(
      array(
        'post_title' => 'Auto Draft',
        'post_type'  => 'post',
        'post_name'  => 'auto-draft-1',
      )
    );
    $this->assertInstanceOf( 'WP_Post', $r );
    $post_ids[] = $r->ID;

    // Draft.
    $r = $menus->insert_auto_draft_post(
      array(
        'post_title' => 'Draft',
        'post_type'  => 'post',
        'post_name'  => 'auto-draft-2',
      )
    );
    $this->assertInstanceOf( 'WP_Post', $r );
    wp_update_post(
      array(
        'ID'          => $r->ID,
        'post_status' => 'draft',
      )
    );
    $post_ids[] = $r->ID;

    $drafted_post_ids = $post_ids;

    // Private (this will exclude it from being considered a stub).
    $r = $menus->insert_auto_draft_post(
      array(
        'post_title' => 'Private',
        'post_type'  => 'post',
        'post_name'  => 'auto-draft-3',
      )
    );
    $this->assertInstanceOf( 'WP_Post', $r );
    wp_update_post(
      array(
        'ID'          => $r->ID,
        'post_status' => 'private',
      )
    );
    $post_ids[]      = $r->ID;
    $private_post_id = $r->ID;

    // Trashed (this will exclude it from being considered a stub).
    $r = $menus->insert_auto_draft_post(
      array(
        'post_title' => 'Trash',
        'post_type'  => 'post',
        'post_name'  => 'auto-draft-4',
      )
    );
    $this->assertInstanceOf( 'WP_Post', $r );
    wp_trash_post( $r->ID );
    $post_ids[]      = $r->ID;
    $trashed_post_id = $r->ID;

    $pre_published_post_id = $this->factory()->post->create( array( 'post_status' => 'publish' ) );

    $setting_id = 'nav_menus_created_posts';
    $this->wp_customize->set_post_value( $setting_id, array_merge( $post_ids, array( $pre_published_post_id ) ) );
    $setting = $this->wp_customize->get_setting( $setting_id );
    $this->assertInstanceOf( 'WP_Customize_Filter_Setting', $setting );
    $this->assertSame( array( $menus, 'sanitize_nav_menus_created_posts' ), $setting->sanitize_callback );
    $this->assertSame( $drafted_post_ids, $setting->post_value() );
    $this->assertArrayNotHasKey( $private_post_id, $post_ids );
    $this->assertArrayNotHasKey( $trashed_post_id, $post_ids );

    $this->assertSame( 'auto-draft', get_post_status( $drafted_post_ids[0] ) );
    $this->assertSame( 'draft', get_post_status( $drafted_post_ids[1] ) );
    foreach ( $drafted_post_ids as $post_id ) {
      $this->assertEmpty( get_post( $post_id )->post_name );
      $this->assertNotEmpty( get_post_meta( $post_id, '_customize_draft_post_name', true ) );
    }

    $save_action_count = did_action( 'customize_save_nav_menus_created_posts' );
    $setting->save();
    $this->assertSame( $save_action_count + 1, did_action( 'customize_save_nav_menus_created_posts' ) );
    foreach ( $drafted_post_ids as $post_id ) {
      $this->assertSame( 'publish', get_post_status( $post_id ) );
      $this->assertMatchesRegularExpression( '/^auto-draft-\d+$/', get_post( $post_id )->post_name );
      $this->assertEmpty( get_post_meta( $post_id, '_customize_draft_post_name', true ) );
    }

    $this->assertSame( 'private', get_post_status( $private_post_id ) );
    $this->assertSame( 'trash', get_post_status( $trashed_post_id ) );

    // Ensure that unique slugs were assigned.
    $posts      = array_map( 'get_post', $drafted_post_ids );
    $post_names = wp_list_pluck( $posts, 'post_name' );