c# - 使用 Moq 验证采用委托(delegate)参数的基类中的方法调用

Question

我正在尝试测试是否调用了一个方法，并且该方法存在于被测类的基类中。

当我使用一个简单的字符串参数运行下面的示例时，它可以工作，但是当有一个委托(delegate)参数时，测试失败。

我创建了以下示例来演示该问题。如果在SomeMethod中取出delegate参数，在测试中，测试就会通过。

失败代码:

public abstract class BaseClass
{
    public virtual void SomeMethod(string someString, Func<bool> function)
    {
        //do something
    }
}

public class DerivedClass : BaseClass
{
    public void DoSomething()
    {
        SomeMethod("foo", () => true);
    }
}

[TestClass]
public class Tests
{
    [TestMethod]
    public void TestMethod1()
    {
        var test = new Mock<DerivedClass>();
        test.Object.DoSomething();
        test.Verify(x => x.SomeMethod("foo", () => true), Times.AtLeastOnce);
    }
}

传递代码:

public abstract class BaseClass
{
    public virtual void SomeMethod(string someString)
    {
        //do something
    }
}

public class DerivedClass : BaseClass
{
    public void DoSomething()
    {
        SomeMethod("foo");
    }
}

[TestClass]
public class Tests
{
    [TestMethod]
    public void TestMethod1()
    {
        var test = new Mock<DerivedClass>();
        test.Object.DoSomething();
        test.Verify(x => x.SomeMethod("foo"), Times.AtLeastOnce);
    }
}

测试失败的错误信息:

Expected invocation on the mock at least once, but was never performed: x => x.SomeMethod("foo", () => True)
No setups configured.

Performed invocations:
BaseClass.SomeMethod("foo", System.Func1[System.Boolean])`

整个错误信息:

Test method UnitTestProject1.Tests.TestMethod1 threw exception: 
Moq.MockException: 
Expected invocation on the mock at least once, but was never performed: x => x.SomeMethod("foo", () => True)
No setups configured.

Performed invocations:
BaseClass.SomeMethod("foo", System.Func`1[System.Boolean])
   at Moq.Mock.ThrowVerifyException(MethodCall expected, IEnumerable`1 setups, IEnumerable`1 actualCalls, Expression expression, Times times, Int32 callCount)
   at Moq.Mock.VerifyCalls(Interceptor targetInterceptor, MethodCall expected, Expression expression, Times times)
   at Moq.Mock.Verify(Mock`1 mock, Expression`1 expression, Times times, String failMessage)
   at Moq.Mock`1.Verify(Expression`1 expression, Times times)
   at Moq.Mock`1.Verify(Expression`1 expression, Func`1 times)
   at UnitTestProject1.Tests.TestMethod1() in UnitTest1.cs: line 16

Answer 1

如果我将测试更改为以下，它就会通过。看我改了() => true至 It.IsAny<Func<bool>>()这意味着它可以用任何 Func 调用。你关心它是不是() => true ？

var test = new Mock<DerivedClass>();
test.Object.DoSomething();
test.Verify(x => x.SomeMethod("foo", It.IsAny<Func<bool>>()), Times.AtLeastOnce);