tests/lib/html/fileapi_file_entry_test.dart

// Copyright (c) 2020, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'dart:async';
import 'dart:html';

import 'package:async_helper/async_minitest.dart';

class FileAndDir {
  FileEntry file;
  DirectoryEntry dir;
  FileAndDir(this.file, this.dir);
}

main() {
  if (!FileSystem.supported) return;
  // Prepend this file name to prevent collisions among tests runnning on the
  // same browser.
  const prefix = 'fileapi_file_entry_';

  // Do the boilerplate to get several files and directories created to then
  // test the functions that use those items.
  Future doDirSetup(String testName) async {
    final fs = await window.requestFileSystem(100);
    var file =
        await fs.root!.createFile('${prefix}file_$testName') as FileEntry;
    var dir = await fs.root!.createDirectory('${prefix}dir_$testName')
        as DirectoryEntry;
    return new Future.value(new FileAndDir(file, dir));
  }

  test('createWriter', () async {
    var fileAndDir = await doDirSetup('createWriter');
    var writer = await fileAndDir.file.createWriter();
    expect(writer.position, 0);
    expect(writer.readyState, FileWriter.INIT);
    expect(writer.length, 0);
  });

  test('file', () async {
    var fileAndDir = await doDirSetup('file');
    var fileObj = await fileAndDir.file.file();
    expect(fileObj.name, fileAndDir.file.name);
    expect(fileObj.relativePath, '');
    expect(
        new DateTime.now().difference(fileObj.lastModifiedDate).inMinutes < 30,
        isTrue);
  });
}