与Moq嘲笑代表

Question

我有一个界面:

public interface IRepeater
{
    void Each(string path, Action<string> action);
}

我想用这个模拟这个界面Moq.现在我可以做到以下几点:

var mock = new Mock<IRepeater>();
mock.Setup(m => m.Each(It.IsAny<string>(), It.IsAny<Action<string>>());

但是,为了帮助测试,我希望能够模拟将string其传递给Action<string>.可以这样做Moq吗？如果有,怎么样？

更新

澄清我正在测试class一个依赖于它的不同的东西IRepeater.我想嘲笑IRepeater.Each,所以我可以控制string的Action得到,所以我可以测试的行为.

例

所以如果我有class这样的话.

public class Service
{
    private readonly IRepeater _repeater;

    public Service(IRepeater repeater)
    {
        _repeater = repeater;
    }

    public string Parse(string path)
    {
        var builder = new StringBuilder();

        _repeater.Each(path, line => builder.Append(line));

        return builder.ToString();
    }
}

我如何模拟IRepeater.Each以便我可以测试Service.Parse？

Answer 1

你必须使用callback方法.由于line => builder.Append(line)是方法行为的一部分,因此在测试方法时必须执行此行为:

    [TestMethod]
    public void Test_Service_When_Passing_String_And_ActionDelegate()
    {
        var fakeReporter = new Mock<IRepeater>();

        fakeReporter.Setup(x => x.Each(It.IsAny<string>(), It.IsAny<Action<string>>()))
            .Callback<string, Action<string>>((s, action) => action(s));

        var target = new Service(fakeReporter.Object);

        var result = target.Parse("asdfghj");

        Assert.AreEqual("asdfghj", result);
    }

测试此方法的另一种方法是验证使用正确的路径调用方法,然后验证操作是否是正确的操作:

     [TestMethod]
    public void Test_Service_When_Passing_String_And_ActionDelegate()
    {
        var fakeReporter = new Mock<IRepeater>();

        fakeReporter.Setup(x => x.Each(It.IsAny<string>(), It.IsAny<Action<string>>()))
            .Callback<string, Action<string>>((s, action) =>
            {
                Assert.AreEqual("asdfghj", s);
                foreach (var w in "pass")
                {
                    action(w.ToString());
                }
            });

        var target = new Service(fakeReporter.Object);

        var result = target.Parse("asdfghj");

        Assert.AreEqual("pass", result);
    }

顺便说一下你可以用It.IsAny<string>()字符串替换掉然后删除Assert.AreEqual("asdfghj", s);(我只是想以明确的方式测试事物......)