PowerMock，mockito，验证静态方法 [英] PowerMock, mockito, verify static method

问题描述

我正在尝试让PowerMock与mockito一起使用，我在这里关注文档： http://code.google.com/p/powermock/wiki/MockitoUsage13 。

为了简化一下，我们假设我有一个静态方法：

  StaticObj.put（String key，String val）{...} 
  

和班级要测试的是这样的：

  public class ClassToTest {
 public void doSomething（Params p）{
 if（StringUtils.isNotBlank（p.getK（））StaticObj.put（k1，p.getK（））; 
 if（StringUtils.isNotBlank（p.getX（））StaticObj.put（ x1，p.getX（））; 
} 
} 
  

In我的单元测试我想验证当它们不为空或为null时，为K和X调用StaticObj.put，所以我做这样的事情：

  public void testNormalCase（）{
 //假设某些@Before函数已经发生了静态的模拟设置.. 
 Params params = new Params（k， x）; 
 ClassToTest classToTest = new ClassToTest（）; 
 classToTest.doSomething（params）; 
 
 / /现在我要验证：
 PowerMockito.verifyStatic（times（1））; 
 StaticObj.put（k1，k1）; 
 
 PowerMockito.verifyStatic（times（1））; 
 StaticObj.put（x1，x）; 
} 
  

这是有效的，这是我所期待的。什么行不通，如果我注释掉K的验证，那么X的验证失败了！错误消息表明（x1，x）是预期但得到（k1，k）。为什么是这样？我没有正确编码吗？

此外，它让我相信以下类型的测试可能会完全错误地传递：

  public void testOtherCase（）{
 //假设某些@Before函数已经发生了静态的模拟设置.. 
 Params params = new Params（k，null）; 
 ClassToTest classToTest = new ClassToTest（）; 
 classToTest.doSomething（）; 
 
 //现在我要验证：
 
 PowerMockito.verifyStatic（never（））; 
 StaticObj.put（eq（x1），anyString（））; 
} 
  

例如。我想知道powermock是否看到k1，决定从未调用过x1并且通过。 （？）

为了说明一般情况，我有一个静态方法，称为N次（其中N根据输入参数变化）。我想验证它是在正确的情况下调用的（可以通过输入参数确定）。似乎powermock不能很好地解决这个问题，除非我误解。

感谢任何想法！

解决方案

我仔细阅读了这个问题和问题，但不确定我是否清楚地理解了它们 - 根据我的理解，当你传递k和x但只验证k时，powermock会引发异常是正确的。

因为你在模拟静态方法StaticObj.put，当你传递参数k和x并用

$ b <$验证它时p $ p> PowerMockito.verifyStatic（次（1））;
StaticObj.put（k1，k1）;

PowerMockito.verifyStatic（times（1））;
StaticObj.put（x1，x）;


这应该有效。当您验证参数k和x并验证k被注释掉时。

  // PowerMockito.verifyStatic（times（1） ）; 
 // StaticObj.put（k1，k1）; 
 
 PowerMockito.verifyStatic（times（1））; 
 StaticObj.put（x1，x）; 
  

Powermock首先会得到put（k1...）的调用，所以验证x会引发错误。您的验证过程已按顺序排列。

I'm trying to get PowerMock to work with mockito, and I'm following the documentation here: http://code.google.com/p/powermock/wiki/MockitoUsage13.

To simplify a bit, lets say that I have a static method:

StaticObj.put(String key, String val) { ... }

And the class to be tested does something like this:

public class ClassToTest {
    public void doSomething(Params p) {
        if (StringUtils.isNotBlank(p.getK()) StaticObj.put("k1", p.getK());
        if (StringUtils.isNotBlank(p.getX()) StaticObj.put("x1", p.getX());
    }
}

In my unit test I'd like to verify that StaticObj.put is called for K and X when they are not blank or null, so I do something like this:

public void testNormalCase() {
    // assume that mocking setup for statics already happened in some @Before function..
    Params params = new Params("k", "x");
    ClassToTest classToTest = new ClassToTest();
    classToTest.doSomething(params);

    // now I want to verify:
    PowerMockito.verifyStatic(times(1));
    StaticObj.put("k1", "k1");

    PowerMockito.verifyStatic(times(1));
    StaticObj.put("x1", "x");
}

This works, and it's what I'd expect. What doesn't work, is if I comment out the verification for K, then the verification for X fails! The error message indicates that ("x1", "x") is expected but got ("k1", "k"). Why is this? Am I not coding this correctly?

Also it leads me to believe that the following type of test, which passes, might pass for the wrong reason entirely:

public void testOtherCase() {
    // assume that mocking setup for statics already happened in some @Before function..
    Params params = new Params("k", null);
    ClassToTest classToTest = new ClassToTest();
    classToTest.doSomething();

    // now I want to verify:

    PowerMockito.verifyStatic(never());
    StaticObj.put(eq("x1"), anyString());
}

E.g. I wonder if powermock sees "k1", decides that "x1" was never called, and passes. (?)

To state it generally, I have a static method that is called N times (where N changes depending on the input params). And I want to verify that it was called in the correct cases (which can be determined by input params). It seems like powermock doesn't handle this well, unless I misunderstand.

Thanks for any ideas!

解决方案

I read this question and the issue carefully but not sure if I understood them clearly - From my understanding, it's correct that powermock raise the exception when you pass k and x but only verify k.

Because you are mocking the static method StaticObj.put, when you pass parameter k and x and verify it with

PowerMockito.verifyStatic(times(1));
StaticObj.put("k1", "k1");

PowerMockito.verifyStatic(times(1));
StaticObj.put("x1", "x"); 

This should work. And when you verify parameter k and x with verification for k is commented out.

// PowerMockito.verifyStatic(times(1));
// StaticObj.put("k1", "k1");

PowerMockito.verifyStatic(times(1));
StaticObj.put("x1", "x");

Powermock will get the invocation with put("k1"...) first apparently, so the verification of x will raise an error. Your verification process is sequenced.

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