是否有可能与Mockito做严格的嘲笑？ | 是否有可能与Mockito做严格的嘲笑

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问题描述

我想使用严格的模拟，至少在第一次开发一些针对旧代码的测试时，所以如果我没有专门定义期望，那么在我的模拟上调用的任何方法都会抛出异常。

I'd like to use strict mocks, at least when developing for the first time some tests against old code, so any methods invoked on my mock will throw an exception if I didn't specifically define expectations.

从我看到的情况来看，如果我没有定义任何期望，Mockito将只返回null，稍后会在其他地方导致NullPointerException。

From what I've come to see, Mockito if I didn't define any expectations will just return null, which will later on cause a NullPointerException in some other place.

是否可以这样做？如果是，怎么做？

Is it possible to do that? If yes, how?

推荐答案

你想要它做什么？

您可以将其设置为，它避免了NPE并包含一些有用的信息。

You can set it to RETURN_SMART_NULLS, which avoids the NPE and includes some useful info.

你可以用自定义实现替换它，例如，从它的引发异常回答方法：

You could replace this with a custom implementation, for example, that throws an exception from its answer method:

@Test
public void test() {
    Object mock = Mockito.mock(Object.class, new NullPointerExceptionAnswer());
    String s = mock.toString(); // Breaks here, as intended.
    assertEquals("", s);
}

class NullPointerExceptionAnswer<T> implements Answer<T> {
    @Override
    public T answer(InvocationOnMock invocation) throws Throwable {
        throw new NullPointerException();
    }
}

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