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stackoverflow 有人回答  免錢的套件是不支援擴充方法(靜態)的

看起來 付費 JustMock  可以支援擴充方法(靜態)的

    public interface ICalculator
    {
    }

    public static class ICalculatorExtension
    {
        public static int Clear(this ICalculator calculator, int level)
        {
            return level;
        }
    }

    public class MyDemo
    {
        private readonly ICalculator _calculator;
        public MyDemo(ICalculator calculator)
        {
            this._calculator = calculator;
        }
        public void Action1(bool clearFlag)
        {
            if (clearFlag == true)
            {
                this._calculator.Clear(7);
            }
        }
    }
    [TestMethod]
    public void test1()
    {
        //arrange
        //NSubstitute會產生一個ICalculator 假的實體出來
        ICalculator calculator = Substitute.For<ICalculator>();
        //calculator.Add("A").Returns("A");
        var myDemo = new MyDemo(calculator);

        //act
        myDemo.Action1(true);

        //assert 以下都不會報錯
        calculator.DidNotReceive().Clear(7);
        calculator.Received(5).Clear(7);
        calculator.Received(1).Clear(1);

    }