如何使用ArgumentCaptor进行存根？ [英] How to use ArgumentCaptor for stubbing?

问题描述

在Mockito 文档和 javadocs 它说

In Mockito documentation and javadocs it says

建议使用ArgumentCaptor进行验证但不使用存根。

It is recommended to use ArgumentCaptor with verification but not with stubbing.

但我不明白ArgumentCaptor如何用于存根。有人可以解释上面的陈述并说明如何使用ArgumentCaptor进行存根或提供一个显示如何完成的链接吗？

but I don't understand how ArgumentCaptor can be used for stubbing. Can someone explain the above statement and show how ArgumentCaptor can be used for stubbing or provide a link that shows how it can be done?

推荐答案

假设要测试以下方法：

public boolean doSomething(SomeClass arg);

Mockito文档说你应该不以这种方式使用captor：

Mockito documentation says that you should not use captor in this way:

when(someObject.doSomething(argumentCaptor.capture())).thenReturn(true);
assertThat(argumentCaptor.getValue(), equalTo(expected));

因为您可以在存根期间使用匹配器：

Because you can just use matcher during stubbing:

when(someObject.doSomething(eq(expected))).thenReturn(true);

但验证是另一回事。如果您的测试需要确保使用特定参数调用此方法，请使用 ArgumentCaptor ，这就是设计它的情况：

But verification is a different story. If your test needs to ensure that this method was called with a specific argument, use ArgumentCaptor and this is the case for which it is designed:

ArgumentCaptor<SomeClass> argumentCaptor = ArgumentCaptor.forClass(SomeClass.class);
verify(someObject).doSomething(argumentCaptor.capture());
assertThat(argumentCaptor.getValue(), equalTo(expected));

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