public/dart/sledge/test/sledge_page_id_test.dart

// Copyright 2018 The Fuchsia Authors. 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:typed_data';

import 'package:lib.app.dart/logging.dart';
import 'package:fidl_fuchsia_ledger/fidl.dart' as ledger;
import 'package:sledge/sledge.dart';
import 'package:test/test.dart';

void main() {
  setupLogger();

  test('Create SledgePageId objects', () {
    final a = SledgePageId();
    final b = SledgePageId('');
    final c = SledgePageId('foo');
    final d = SledgePageId(
        'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ');
    expect(a.id.id, equals(b.id.id));
    expect(SledgePageId.pageIsManagedBySledge(a.id), equals(true));
    expect(SledgePageId.pageIsManagedBySledge(b.id), equals(true));
    expect(SledgePageId.pageIsManagedBySledge(c.id), equals(true));
    expect(SledgePageId.pageIsManagedBySledge(d.id), equals(true));
  });

  test('pageIsManagedBySledge detects PageIds not managed by Sledge', () {
    final bytes = Uint8List(16);
    final pageId = ledger.PageId(id: bytes);
    expect(SledgePageId.pageIsManagedBySledge(pageId), equals(false));
  });

  test('make sure PageIds are not accidentely updated', () {
    // The goal of this test is to detect accidental changes in the encoding of
    // the SledgePageId, because if the encoding changes then clients of Sledge
    // won't be able to read their data back.
    // The format of the expected value is described in SledgePageId.
    final sledgePageId = SledgePageId('foo');
    expect(
        sledgePageId.id.id,
        equals([
          115, // 's'
          108, // 'l'
          101, // 'e'
          100, // 'd'
          103, // 'g'
          101, // 'e'
          51, // '3'
          95, // '_'
          44,
          38,
          180,
          107,
          104,
          255,
          198,
          143
        ]));
  });
}