使用 Mockito 调用 new() 测试类 [英] Test class with a new() call in it with Mockito

问题描述

我有一个遗留类，其中包含一个用于实例化 LoginContext 对象的 new() 调用:

I have a legacy class that contains a new() call to instantiate a LoginContext object:

public class TestedClass {
  public LoginContext login(String user, String password) {
    LoginContext lc = new LoginContext("login", callbackHandler);
  }
}

我想使用 Mockito 测试这个类来模拟 LoginContext，因为它要求在实例化之前设置 JAAS 安全性内容，但我不确定如何在不更改 login() 方法将 LoginContext 外部化.

I want to test this class using Mockito to mock the LoginContext as it requires that the JAAS security stuff be set up before instantiating, but I'm not sure how to do that without changing the login() method to externalize the LoginContext.

是否可以使用 Mockito 来模拟 LoginContext 类?

Is it possible using Mockito to mock the LoginContext class?

推荐答案

对于未来我会推荐 Eran Harel 的回答(重构将 new 移动到可以模拟的工厂).但是，如果您不想更改原始源代码，请使用非常方便且独特的功能:间谍.来自文档:

For the future I would recommend Eran Harel's answer (refactoring moving new to factory that can be mocked). But if you don't want to change the original source code, use very handy and unique feature: spies. From the documentation:

您可以创建真实对象的间谍.当你使用 spy 时，真正的方法被调用(除非一个方法被存根).

You can create spies of real objects. When you use the spy then the real methods are called (unless a method was stubbed).

应该谨慎地偶尔使用真正的间谍，例如在处理遗留代码时.

Real spies should be used carefully and occasionally, for example when dealing with legacy code.

在你的情况下，你应该写:

In your case you should write:

TestedClass tc = spy(new TestedClass());
LoginContext lcMock = mock(LoginContext.class);
when(tc.login(anyString(), anyString())).thenReturn(lcMock);

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