[TestMethod]
public void TestNavigationSyncWithSelection()
{
    // 测试如果修改Selection，那么NavigationService.MoveCurrentTo方法应该被调用。
    // 1. 准备
    // 1.1 搭建环境
    var c = new ServiceContainer();
    var dataManager = new SpreadSheetDataManager(32, 8);
    // 1.2 构造被测对象
    var selectionService = new SelectionService();
    // 1.3 初始化被测对象

    // 1.4 构造Mock对象
    var mockNavigationService = new Mock<INavigationService>();
    // 1.5 初始化和配置Mock对象
    c.AddService(mockNavigationService);
    mockNavigationService.Setup(s => s.CanMoveCurrentTo(It.IsAny<CellPosition>()))
        .Returns(true);

    // 1.6 连接被测对象和依赖项
    c.AddService<ISelectionService>(selectionService); // 这里隐式的将SelectionService和NavigationService连接在一起了。因为他们都被放到了一个容器里面。
    (selectionService as IService).Attach(c, dataManager);

    // 2. 声明期待
    mockNavigationService.Setup(s => s.MoveCurrentTo(new CellPosition(0, 1))); // navigationService的MoveCurrentTo方法期待被调用，并且参数为【0，1】。

    // 3. 执行测试
    selectionService.Select(new CellRange(0, 1, 2, 2));

    // 4. 校验
    // 4.1 校验Mock对象期待的动作被正确的调用了。
    mockNavigationService.VerifyAll();
    // 4.2 校验被测对象的状态。
    Assert.AreEqual(new CellRange(0, 1, 2, 2), selectionService.CurrentSelection);
}

[TestMethod]
public void TestNavigationSyncWithSelection()
{
    // 测试如果修改Selection，那么NavigationService.MoveCurrentTo方法应该被调用。  << 简要的注释描述测试的重点，很多时候“人话”还是简练很多

    // Prepare
    var c = new ServiceContainer();
    var dataManager = new SpreadSheetDataManager(32, 8);

    var selectionService = new SelectionService();

    var mockNavigationService = new Mock<INavigationService>();
    c.AddService(mockNavigationService);
    mockNavigationService.Setup(s => s.CanMoveCurrentTo(It.IsAny<CellPosition>()))
        .Returns(true);

    c.AddService<ISelectionService>(selectionService);
    (selectionService as IService).Attach(c, dataManager);

    // Expect
    mockNavigationService.Setup(s => s.MoveCurrentTo(new CellPosition(0, 1)));

    // Act
    selectionService.Select(new CellRange(0, 1, 2, 2));

    // Verity
    mockNavigationService.VerifyAll();
    Assert.AreEqual(new CellRange(0, 1, 2, 2), selectionService.CurrentSelection);
}