在 Moq 中模拟被测主题的方法?

Mock a method of the subject under test in Moq?(在 Moq 中模拟被测主题的方法?)

问题描述

我想测试我班级的方法 A，但不调用通常由 A 调用的实际方法 B.这是因为 B 有很多外部交互，我现在不想测试.

I want to test method A of my class, but without calling the actual method B which is normally called by A. That's because B has a lot of external interactions I don't want to test for now.

我可以为 B 调用的所有服务创建模拟，但这是相当多的工作.我宁愿只是模拟 B 并让它返回示例数据.

I could create mocks for all the services called by B, but that's quite some work. I'd rather just mock B and make it return sample data.

这可能与 Moq 框架有关吗?

Is that possible to do with Moq framework?

推荐答案

是的，有一个问题！您必须确保方法 B 是虚拟的并且可以被覆盖.

It is, with a catch! You have to make sure method B is virtual and can be overriden.

然后，将模拟设置为在未提供设置时调用基本方法.然后你设置B，但不设置A.因为没有设置A，实际的实现会被调用.

Then, set the mock to call the base methods whenever a setup is not provided. Then you setup B, but don't setup A. Because A was not setup, the actual implementation will be called.

var myClassMock = new Mock<MyClass>();
myClassMock.Setup(x => x.B()); //mock B

myClassMock.CallBase = true;

MyClass obj = myClassMock.Object;
obj.A(); // will call the actual implementation
obj.B(); // will call the mock implementation

在幕后，Moq 将动态创建一个扩展 MyClass 并覆盖 B 的类.

Behinds the scenes, Moq will dynamically create a class that extends MyClass and overrides B.

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