Mockito - 如何验证从未调用过模拟

2022-01-14 00:00:00 mockito java junit

我正在寻找一种使用 Mockito 验证的方法，即在测试期间与给定的模拟没有任何交互.对于具有验证模式 never() 的给定方法，很容易实现这一点，但我还没有找到完整模拟的解决方案.

I'm looking for a way to verify with Mockito, that there wasn't any interaction with a given mock during a test. It's easy to achieve that for a given method with verification mode never(), but I haven't found a solution for the complete mock yet.

我真正想要实现的目标:在测试中验证，没有任何东西打印到控制台.jUnit 的总体思路是这样的:

What I actually want to achieve: verify in tests, that nothing get's printed to the console. The general idea with jUnit goes like that:

private PrintStream systemOut;

@Before
public void setUp() {
    // spy on System.out
    systemOut = spy(System.out);
}

@After
public void tearDown() {
    verify(systemOut, never());  // <-- that doesn't work, just shows the intention
}

一个 PrintStream 有很多方法，我真的不想用单独的验证来验证每一个方法 - System.err 也是如此...

A PrintStream has tons of methods and I really don't want to verify each and every one with separate verify - and the same for System.err...

所以我希望，如果有一个简单的解决方案，我可以，考虑到我有很好的测试覆盖率，强制软件工程师(和我自己)删除他们的(我的)调试代码，比如 System.out.println("Breakpoint#1"); 或 e.printStacktrace(); 在提交更改之前.

So I hope, if there's an easy solution, that I can, given that I have a good test coverage, force the software engineers (and myself) to remove their (my) debug code like System.out.println("Breakpoint#1"); or e.printStacktrace(); prior to committing changes.

推荐答案

使用这个:

import static org.mockito.Mockito.verifyZeroInteractions;

// ...

private PrintStream backup = System.out;

@Before
public void setUp() {
    System.setOut(mock(PrintStream.class));
}

@After
public void tearDown() {
    verifyZeroInteractions(System.out);
    System.setOut(backup);
}

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