base class can not be mocked

[MiaHesham]

public class ITestController : Controller
{

    public ITestController() {
    }
    
    public virtual bool re(string z)
    {
        if(z == null) { return false; }
        else
        {
            return true;
        }
    }
}

public class TestController : ITestController
{

    public TestController() {
    }
    public int Index(int x,int y)
    {
         if (base.re("ll")==true)
            {
                return x * y;
            }
            return x + y;
        
       
    }
   
}

[Fact]
public async Task test()
{
var _TestController = new Mock { CallBase = true };
_TestController.Setup(a => a.re(It.IsAny())).Returns(true);

        var res=  _TestController.Object.Index(1, 2);
        Assert.Equal(res,5);

    }

my problem is re function will be evaluated.
I don't need to evaluate re function

[stakx]

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