将 Moq 与 Linq Any() 结合使用

Question

我有一个类似于下面的设置：

    [TestMethod]
    public void NoIntegers()
    {
        Mock<IBar> mockBar = new Mock<IBar>(MockBehavior.Strict);
        Mock<IEnumerable<int>> mockIntegers = new Mock<IEnumerable<int>>(MockBehavior.Strict);

        mockBar
            .SetupGet(x => x.Integers)
            .Returns(mockIntegers.Object);

        mockIntegers
            .Setup(x => x.Any())
            .Returns(false);

        Assert.IsFalse(new Foo(mockBar.Object).AreThereIntegers());
    }

    public interface IBar
    {
        IEnumerable<int> Integers { get; }
    }

    public class Foo
    {
        private IBar _bar;

        public Foo(IBar bar)
        {
            _bar = bar;
        }

        public bool AreThereIntegers()
        {
            return _bar.Integers.Any();
        }
    }
}

当它运行时，它无法初始化模拟

Test method NoIntegers threw exception: System.NotSupportedException: Expression references a method that does not belong to the mocked object: x => x.Any<Int32>()

我尝试添加It.IsAny()几种形式：

mockIntegers
    .Setup(x => x.Any(It.IsAny<IEnumerable<int>>(), It.IsAny<Func<int, bool>>()))
    .Returns(false);

// No method with this signiture


mockIntegers
    .Setup(x => x.Any(It.IsAny<Func<int, bool>>()))
    .Returns(false);

// Throws: Test method NoIntegers threw exception: 
// System.NotSupportedException: 
// Expression references a method that does not belong to the mocked object:
//  x => x.Any<Int32>(It.IsAny<Func`2>())

我需要模拟什么才能运行它？

Answer 1

您只需要模拟Integers财产。不需要模拟（无论如何你都不能这样做，因为它是一个扩展方法），因为它是SUTAny()的一部分。针对两种情况，您应该如何执行此操作：

[TestMethod]
public void NoIntegers()
{
    Mock<IBar> mockBar = new Mock<IBar>(MockBehavior.Strict);

    mockBar.SetupGet(x => x.Integers)
           .Returns(new List<int>());

    Assert.IsFalse(new Foo(mockBar.Object).AreThereIntegers());
}

[TestMethod]
public void HasIntegers()
{
    Mock<IBar> mockBar = new Mock<IBar>(MockBehavior.Strict);

    mockBar.SetupGet(x => x.Integers)
           .Returns(new List<int>{ 3, 5, 6});

    Assert.IsTrue(new Foo(mockBar.Object).AreThereIntegers());
}