Struggling with the code challenge.

public class Calculator
{
    public double intialValue;

    //constructor related to the Initialization test method
    public double Calculator(double x)
    {
        intialValue = x;
    }

    //adding method related to the BasicAdd method
    public double Add(double y)
    {
        //adding adds the value passed to the add method to the value the calculator was initialized with
        double total;
        total = y + initialValue;
        return total;        
    }
}

using Xunit;

public class CalculatorTests
{
    [Fact]
    public void Initialization()
    {
        var expected = 1.1;
        var target = new Calculator(1.1);
        Assert.Equal(expected, target.Result, 1);
    }

    [Fact]
    public void BasicAdd()
    {
        var target = new Calculator(1.1);
        target.Add(2.2);
        var expected = 3.3;
        Assert.Equal(expected, target.Result, 1);
    }
}