Question

我上课

public class MyClass
{
   public int MyProperty1 { get; private set; }
   public int MyProperty2 { get; private set; }

   public MyClass(){}
   public MyClass(int myProperty2) => MyProperty2 = myProperty2;
}

在单元测试中，我需要像下面这样声明之前更改MyProperty1的值

[Fact]
public void MyTest()
{
   var fake = NSubstitute.Substitute.For<MyClass>(3);
   fake.MyProperty1.Returns(5);

   //Assertion
}

但是我遇到错误

Outcome: Failed
    Error Message:
    NSubstitute.Exceptions.CouldNotSetReturnDueToNoLastCallException : Could not find a call to return from.

Answer 1

NSubstitute可以not stub non-virtual members of classes（有关说明，请参见How NSubstitute Works）。我强烈建议将NSubstitute.Analyzers软件包添加到任何引用NSubstitute的测试项目中，因为当尝试替换非虚拟方法时，这将提供编译时警告。

将Property1更新为virtual后，测试将按预期进行：

public class MyClass
{
    public virtual int MyProperty1 { get; private set; }
    public int MyProperty2 { get; private set; }

    public MyClass() { }
    public MyClass(int myProperty2) => MyProperty2 = myProperty2;
}

使用NSubstitute模拟具有私有设置者的属性

1 个答案: