Moq.MockException: Expected invocation on the mock exactly 1 times, but was 0 times: x => x.Init()

Question

I have this method which verify if a method is called. I am using xUnit and MOQ in C#.

    [Fact]
    public void VerifyIfInitCalled()
    {
        // Arrange
        var mock = new Mock<ICal>();

        var cal = new Cal(mock.Object);

        // Act
        cal.Init();

        // Assert
        mock.Verify(x => x.Init(), Times.Exactly(1));
    }

and for my Cal class

public class Cal : ICal
{
    private ICal _cal;

    public Cal(ICal cal)
    {
        _cal = cal;
    }

    public void Init()
    {
        Console.WriteLine("Init called"); ;
    }
}

But, I run the unit test, it fails with error Moq.MockException : Expected invocation on the mock exactly 1 times, but was 0 times: x => x.Init() although I have called the Init() method.

Answer 1

Your need to modify your Init() to get your assert right

public void Init()
{
    _cal.Init();
    Console.WriteLine("Init called"); ;
}

and your interface ICal need to have an Init() member.

But clearly you have a conception problem you are implementing ICal and passing it into the class constructor !!.

UPDATE

A unit test is specific to an implementation so your test method need to test the Cal class.

If your class call an other service and you need to mock and setup a method call to get specific result you will use moq