MOQ - 基于参数值设置方法(多个参数)

Question

我有一个定义为的接口

interface IMath
{
 AddNumbersBetween(int lowerVal, int upperVal);
}

我可以为上面设置一个基本的Moq,如下所示:

Mock<IMath> mock = new Mock<IMath>();    
mock.Setup(m => m.AddNumbersBetween(It.IsAny<int>(), It.IsAny<int>()));

叫它

mock.Object.AddNumbersBetween(1,4);

然后验证它是否被调用

mock.Verify(m => m.AddNumbersBetween(1,4), Times.AtleastOnce());

我无法弄清楚如何设置AddNumbersBetween方法,如果upperVal低于lowerVal,则抛出异常

mock.Object.AddNumbersBetween(4,1);//should throw an exception

基本上寻找类似的东西:

mock.Setup(foo => foo.AddNumbersBetween("arg1 is higher than arg2")).Throws<ArgumentException>();

Answer 1

我知道这已经有一年了,但我找到了一种方法,至少使用最新版Moq的多个参数:

mock.Setup(x => x.Method(It.IsAny<int>(), It.IsAny<int>()))
    .Returns<int, int>((a, b) => a < b);

Answer 2

对于单参数方法,最简洁的方法是:

mock.Setup(foo => foo.Submit(IsLarge())).Throws<ArgumentException>();
...
public string IsLarge() 
{ 
  return Match<string>.Create(s => !String.IsNullOrEmpty(s) && s.Length > 100);
}

如果方法有多个参数,则无法应用此选项.仍然可以使用"解决方法",模仿您想要实现的目标:

/// <summary>
/// Tests if a moq can send an exception with argument checking
///</summary>
[TestMethod]
public void TestException()
{
    Mock<IMath> mock = new Mock<IMath>();
    mock.Setup(m => m.AddNumbersBetween(It.IsAny<int>(), It.IsAny<int>()));

    mock.Setup(foo => foo.AddNumbersBetween(It.IsAny<int>(), It.IsAny<int>()))
        .Callback<int, int>((i, j) => CheckArgs(i, j));

    try
    {
        mock.Object.AddNumbersBetween(1, 2);
    }
    catch (Exception ex)
    {
        // Will not enter
        Console.WriteLine("Exception raised: {0}", ex);
    }
    try
    {
        mock.Object.AddNumbersBetween(2, 1);
    }
    catch (Exception ex)
    {
        // Will enter here, exception raised
        Console.WriteLine("Exception raised: {0}", ex);
    }
}

private bool CheckArgs(int i, int j)
{
    if( i > j)
        throw new ArgumentException();
    return true;
}