Moq: How to specify the argument with detail condition when mock a method?

This is my own note to remember how we can pass argument to mocked method in various ways.

Method to mock

I mock following service as an example, though this does nothing anyway.

public class DummyService

{

    public virtual string DummyMethod(string input)

    {

        return input;

    }

}

Mock method with any value

We can use It.IsAny<T> to mock the method which accepts any value of T.

[Fact]

public void Test()

{

    Mock<DummyService> mockedDummyService = new();

    mockedDummyService.Setup(x => 

        x.DummyMethod(It.IsAny<string>())).Returns("dummy result");

}

Mock method with specify value

We can pass actual value to mock the method which triggered only when the argument exactly matches.

[Fact]

public void Test()

{

    Mock<DummyService> mockedDummyService = new();

    mockedDummyService.Setup(x => 

        x.DummyMethod("testInput")).Returns("dummy result");

}

Mock method with more detail condition

Or, we can specify more detail condition by using It.Is<T>(Func<T, bool>). The method will be triggered when I pass string such as MyInput, MyValue, etc.

[Fact]

public void Test()

{

    Mock<DummyService> mockedDummyService = new();

    mockedDummyService.Setup(x => 

        x.DummyMethod(It.Is<string>(x=>x.StartsWith("My")))).Returns("dummy result");

}

And more

Moq.It has way more methods to control input patterns.