起订量+单元测试 - System.Reflection.TargetParameterCountException：参数数量不匹配 [英] Moq + Unit Testing - System.Reflection.TargetParameterCountException: Parameter count mismatch

问题描述

var mock = new Mock<IValueConverter>();

mock.Setup(conv => conv.Convert(It.IsAny<Object>(), It.IsAny<Type>(),
    It.IsAny<Object>(), It.IsAny<CultureInfo>())).Returns((Int32 num) => num + 5);

var value = 5;
var expected = 10;
var actual = mock.Object.Convert(value, null, null, null);

这code抛出一个错误 System.Reflection.TargetParameterCountException：参数数量不匹配当我尝试打电话给 mock.Object。转换（值，NULL，NULL，NULL）; 行。我不知道如果我只是用起订量不当还是什么......

This code throws an error System.Reflection.TargetParameterCountException: Parameter count mismatch. when I attempt to call the mock.Object.Convert(value, null, null, null); line. I'm not sure if I'm just using Moq improperly or what...

推荐答案

这是你的返回条款。你有一个4参数法，你设置的，但你只使用一个1参数的lambda。我跑以下没有问题：

It's your Returns clause. You have a 4 parameter method that you're setting up, but you're only using a 1 parameter lambda. I ran the following without issue:

    [TestMethod]
    public void IValueConverter()
    {
        var myStub = new Mock<IValueConverter>();
        myStub.Setup(conv => conv.Convert(It.IsAny<object>(), It.IsAny<Type>(), It.IsAny<object>(), It.IsAny<CultureInfo>())).
            Returns((object one, Type two, object three, CultureInfo four) => (int)one + 5);

        var value = 5;
        var expected = 10;

        var actual = myStub.Object.Convert(value, null, null, null);

        Assert.AreEqual<int>(expected, (int) actual);
    }

没有例外，测试通过。

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