Question

以下代码段最能说明我要实现的目标：

[Test]
public void ReplayGoalTeamATest()
{
    var stateMachineMock = new Mock<IIceHockeyOddsStateMachine>();

    new IceHockeyActionLogRecord { Event = "goal", Team = "A"}.Replay(stateMachineMock.Object);

    stateMachineMock.Verify(s=>s.TeamAScore++); //Syntax error
}

Answer 1

如果您在IIceHockeyOddsStateMachine界面上同时拥有getter和setter，则可以验证该值是否增加如下：

var stateMachineMock = new Mock<IIceHockeyOddsStateMachine>();

stateMachineMock.SetupAllProperties();

stateMachineMock.Object.TeamAScore = 0;

new IceHockeyActionLogRecord { Event = "goal", Team = "A"}.Replay(stateMachineMock.Object);

Assert.That(stateMachineMock.Object.TeamAScore, Is.EqualTo(1));

Answer 2

执行s.TeamAScore++时，您有两种不同的操作，您应该设置并验证这些操作。第一个操作是从您的依赖项中获取当前分数，第二个操作是设置新分数：

int score = stateMachine.TeamAScore;
// other staff
stateMachine.TeamAScore = score + 1;

所以，我会明确定义这种与依赖的交互：

// Arrange
Mock<IIceHockeyOddsStateMachine> stateMachineMock = new Mock<IIceHockeyOddsStateMachine>();
stateMachineMock.SetupGet(s => s.TeamAScore).Returns(0);
IceHockeyActionLogRecord record = new IceHockeyActionLogRecord { Event = "goal", Team = "A"};
// Act
record.Replay(stateMachineMock.Object);
// Assert
stateMachineMock.VerifySet(s => s.TeamAScore = 1);

在这种情况下，您正在测试IceHockeyActionLogRecord，它与依赖关系的交互方式。测试成为对象之间交互的规范。

当您验证TeamAScore值时，您正在测试模拟实现。使用Callback也会测试你的代码，而不是测试对象之间的交互。

另外，我会在测试中给出魔术数字的名称，甚至提供参数：

[TestCase(0, 1)]
[TestCase(50, 51)]
public void ShouldIncrementTeamScore(int initialScore, int expectedScore)
{
    var stateMachineMock = new Mock<IIceHockeyOddsStateMachine>();
    stateMachineMock.SetupGet(s => s.TeamAScore).Returns(initialScore);
    IceHockeyActionLogRecord foo = new IceHockeyActionLogRecord();
    foo.Replay(stateMachineMock.Object);
    stateMachineMock.VerifySet(s => s.TeamAScore = expectedScore);            
}

更新：如果您的界面没有属性的getter，那么只需修改Arrange部分的测试（不要设置属性getter调用）：

// Arrange
var stateMachineMock = new Mock<IIceHockeyOddsStateMachine>();
var record = new IceHockeyActionLogRecord { Event = "goal", Team = "A"};
// Act
record.Replay(stateMachineMock.Object);
// Assert
stateMachineMock.VerifySet(s => s.TeamAScore = 1);

Answer 3

您是否尝试过使用.CallBack（）方法？不确定验证是否支持上述实施

MOQ - 验证增量属性调用

3 个答案: