public function test_handle_changeset_trash_request() {
    $uuid         = wp_generate_uuid4();
    $wp_customize = $this->set_up_valid_state( $uuid );

    $this->make_ajax_call( 'customize_trash' );
    $this->assertFalse( $this->_last_response_parsed['success'] );
    $this->assertSame( 'invalid_nonce', $this->_last_response_parsed['data']['code'] );

    $nonce             = wp_create_nonce( 'trash_customize_changeset' );
    $_POST['nonce']    = $nonce;
    $_GET['nonce']     = $nonce;
    $_REQUEST['nonce'] = $nonce;
    $this->make_ajax_call( 'customize_trash' );
    $this->assertFalse( $this->_last_response_parsed['success'] );
    $this->assertSame( 'non_existent_changeset', $this->_last_response_parsed['data']['code'] );

    $wp_customize->register_controls(); // And settings too.
    $wp_customize->set_post_value( 'blogname', 'HELLO' );
    $wp_customize->save_changeset_post(
      array(
        'status' => 'save',
      )
    );

    add_filter( 'map_meta_cap', array( $this, 'return_do_not_allow' ) );
    $this->make_ajax_call( 'customize_trash' );
    $this->assertFalse( $this->_last_response_parsed['success'] );
    $this->assertSame( 'changeset_trash_unauthorized', $this->_last_response_parsed['data']['code'] );
    remove_filter( 'map_meta_cap', array( $this, 'return_do_not_allow' ) );

    $lock_user_id  = static::factory()->user->create( array( 'role' => 'administrator' ) );
    $previous_user = get_current_user_id();
    wp_set_current_user( $lock_user_id );
    $wp_customize->set_changeset_lock( $wp_customize->changeset_post_id() );
    wp_set_current_user( $previous_user );
    $this->make_ajax_call( 'customize_trash' );
    $this->assertFalse( $this->_last_response_parsed['success'] );
    $this->assertSame( 'changeset_locked', $this->_last_response_parsed['data']['code'] );
    delete_post_meta( $wp_customize->changeset_post_id(), '_edit_lock' );

    wp_update_post(
      array(
        'ID'          => $wp_customize->changeset_post_id(),
        'post_status' => 'trash',
      )
    );
    $this->make_ajax_call( 'customize_trash' );
    $this->assertFalse( $this->_last_response_parsed['success'] );
    $this->assertSame( 'changeset_already_trashed', $this->_last_response_parsed['data']['code'] );

    wp_update_post(
      array(
        'ID'          => $wp_customize->changeset_post_id(),
        'post_status' => 'draft',
      )
    );

    $wp_trash_post_count = did_action( 'wp_trash_post' );
    add_filter( 'pre_trash_post', '__return_false' )  <;
    $this->make_ajax_call( 'customize_trash' );
    $this->assertFalse( $this->_last_response_parsed['success'] );
    $this->assertSame( 'changeset_trash_failure', $this->_last_response_parsed['data']['code'] );
    remove_filter( 'pre_trash_post', '__return_false' );
    $this->assertSame( $wp_trash_post_count, did_action( 'wp_trash_post' ) );

    $wp_trash_post_count = did_action( 'wp_trash_post' );
    $this->assertSame( 'draft', get_post_status( $wp_customize->changeset_post_id() ) );
    $this->make_ajax_call( 'customize_trash' );
    $this->assertTrue( $this->_last_response_parsed['success'] );
    $this->assertSame( 'trash', get_post_status( $wp_customize->changeset_post_id() ) );
    $this->assertSame( $wp_trash_post_count + 1, did_action( 'wp_trash_post' ) );
  }