如何模拟实例作为参数传递的 class 的非静态方法？

Question

如何模拟传递给方法的参数 class 的非静态方法？我正在测试以下方法：

public Seed getAppleSeed(AppleTree appleTree){
    Seed appleSeed = appleTree.getApple().getSeed();
    //Some logic flow
}

其余 class 如下：

public class AppleTree{
    public Apple getApple(){
        return new Apple():
    }
}

public class Apple{
    public Seed getSeed(){
        return new Seed():
    }
}

最终目标是测试 getAppleSeed() 方法的流程，为此我需要模拟对 getApple 和 getSeed 的调用。

谢谢

Answer 1

用 mocking，像这样：

AppleTree appleTree = Mockito.mock(AppleTree.class);
Apple apple = Mockito.mock(Apple.class);

Seed seed  = new Seed();

Mockito.when(appleTree.getApple()).thenReturn(apple);
Mockito.when(apple.getSeed()).thenReturn(seed);

Seed actual = getAppleSeed(appleTree);

assertThat(actual, is(seed));

尽管如果实际代码与您在问题中概述的一样简单，那么我建议您无需模拟 Apple 或 AppleTree。

如何模拟实例作为参数传递的 class 的非静态方法？

How to mock a non static method of a class whose instance is passed as argument?

java

mocking

junit4

powermockito