如何模拟接口中接口的只读 属性 已经被模拟

Question

public interface IPerson
{
    SalaryCalculator SalaryCalculator { get; }
}

public interface ISalaryCalculator
{

}

public class SalaryCalculator : ISalaryCalculator
{
    public int  JoiningDate { get; set; }
    public SalaryCalculator(int joiningDate)
    {
        JoiningDate = joiningDate;
    }
}

[TestFixture]
public class PersonFixture
{
    IPerson person;
    [SetUp]
    public void SetUp()
    {
        person = Substitute.For<IPerson>();
    }

    [Test]
    public void TestPerson()
    {
        person.SalaryCalculator.Returns(new SalaryCalculator());
          OR
        person.SalaryCalculator.Returns(Substitute.For<ISalaryCalculator>());
    }
}

我尝试使用以上两个选项进行模拟，但不起作用，

NSubstitute.Exceptions.CouldNotSetReturnDueToTypeMismatchException : Can not return value of type ISalaryCalculatorProxy for IPerson.get_SalaryCalculator (expected type SalaryCalculator).

在这种情况下我们如何模拟？

Answer 1

异常指示模拟成员应该是什么 returning。

...expected type SalaryCalculator

return 实际的 class 因为那是模拟接口成员 returns.

SalaryCalculator instance = new SalaryCalculator(1);

person.SalaryCalculator.Returns(instance);