java - 来自抽象类的父类(super class)的模拟字段

Question

我有一个抽象类:

public abstract MySuperEpicAbstractClass {
    @Autowired
    private IMessageWriter messageWriter;

    protected IMessageWriter getMessageWriter() {
        return messageWriter;
    }
}

public abstract class MyEpicAbstractClass extends MySuperEpicAbstractClass {
    //This class usses the getMessageWriter();
}

我的问题很简单，我有一个测试MyEpicAbstractClassTest，它将测试子类MyEpicAbstractClass，那么我如何从父类(super class)中模拟messageWriter？

Answer 1

虽然有很多方法可以做到这一点，但“低技术”、“无框架”和“无重构”版本只是在测试中将其分流。它可能看起来像这样:

public MyEpicAbstractClassTest {
    public void testThatNeedsTheFakeMessageWriter() {
        ShuntedMyEpicAbstractClass meac = new ShuntedMyEpicAbstractClass();

        meac.doSomething("Arguments");

        verify(meac.getMessageWriter()).write("Arguments");
    }
}

// And the shunt is here
public class ShuntedMyEpicAbstractClass extends MyEpicAbstractClass {
    private IMessageWriter stubbedWriter = Mockito.mock(IMessageWriter.class);

    public IMessageWriter getMessageWriter() {
       return stubbedWriter;
    }
}

当您无法像其他海报所建议的那样重构基类时，此技术通常很有用。

希望这有帮助!

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