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You can read the article here: Something that has become a fundimental piece of the language all you need to do is look at the Apache Commons project to see that is so bad that it must be avoided at all costs in the name of testing. Gosling or someone on his team put it in the language for a reason and to avoid those uses solely because your toolset doesn't support the testing of it is nonsense. Time to get a new toolset. Using PowerMock Let's start off with the basics. To use PowerMock, you'll have to download it from Google Code here: Once PowerMock is added to your project, mocking static methods is actually very easy. For this example, we are going to assume we have the following utility class: Now there is an issue with this. The issue is, however, we cannot predict the output. One of the key aspects of unit testing is the ability to predict the output of our test based on a given input. In this case, as we move our test from environment to environment, the results of the above method will change. So the requirements for our use of the above utility class is to create a URL to an image hosted on the local machine. The final URL should be in the following format: The purpose of this tutorial is not to find some painful testing feature, it's to show where the ability to mock static method calls is useful. So let's start our test: First, we don't use the default JUnit runner when we use PowerMock. PowerMock provides it's own runner which we will need to use, specified with the RunWith annotation. The other annotation we are using PrepareForTest is used to identify all of the classes that PowerMock will be mocking. In our case, we will be mocking one class, so we pass in only one. If we have multiple, it can take an array of classes as well. The creation of our setUp and shell test methods should look normal. PrepareForTest; import static org. We're essentially going to do XYZ things: Since static methods exist at the class level, we create a partial mock of all static methods with the mockStatic method. Declare our expectations as normal. To record our expectations we do exactly as we normally would. Replay our recorded expectations. PowerMock has a nice little method called replayAll. Instead of listing out all of the mock objects we want to replay, this method handles it for us. Execute the method under test. PowerMock provides the compliment to replayAll with verifyAll. The above code is all you need to test those "nasty" static methods. The untestable is now testable. I guess we should write the actual implementing code so we can prove all of this works. Ok, check out the method that implements this test below: But what it does do is it implements the test correctly and demonstrates my point. Conclusion So that's it. Mocking static methods and other "untestable code" is actually quite easy when you put PowerMock to work. One thing I want to point out that PowerMock helped me see. Just because you can't do something with your current toolset doesn't mean that it's bad. It just means you may need to re-evaluate your toolset. As always, I'm excited to read your comments! Have you used PowerMock? What about other ways of addressing the same issue? This is why I don't like powermock. It screws with the class loader and using pertest is NOT a good option. Do I still use static methods? Yes, but very rarely. Powermock is great for testing legacy code or stuff you don't have control over, but I think it doesn't force one to think about design the same way that standard Mock APIs do. In short, it's too powerful http:
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