Category Archives: Powermockito mock static method with parameters

Powermockito mock static method with parameters

When writing a unit test, we may constantly need to mock certain classes, so we do not need to go through all the full running mechanism to test the code. According to the stack-overflow discussionMockito is a highly regarded mocking framework.

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The problem though is that Mockito by itself does not have the ability to mock final and static methods. I had to go through quite some try-and-error to make it to work.

The examples in this document will keep a record for me and possibly save some time for the people who are also interested in this subject. PowerMock can be used with either EasyMock or Mockito. This document only shows the usage of PowerMockito. The attached examples are Maven projects. We need to have Maven to run them. If you do not have Maven on your computer, you will need to install it. The Java version used in my testing is "jdk1. The Maven version used in my testing is "3. According to the documentation, we will need to go through the following steps to complete the Maven installation on a Windows computer.

In the Windows environment, many people may be confused about the difference between the user environment variables and the system environment variables.

The differences are the following. After completing all the steps, we can open the Command Prompt Window and type in the following Maven command. We should see the following result, indicating that the Maven installation should have been successful. Each class implements a method called "echoString ". This document comes with two example Maven projects. If we want to run the unit tests with JUnit, we will need to declare the following dependencies:. If we want to run the unit tests with TestNG, we will need to declare the following dependencies:.

If we want to use PowerMockito with JUnit, we will need to write the unit test classes like the following:. If we want to run the unit tests with TestNG, we will need to write the test classes like the following:.

If you want to run the example projects, you can download the attached zip files and unzip them to your desired folder.Mockito allows us to create mock objects and stub the behavior for our test cases. We usually mock the behavior using when and thenReturn on the mock object. Sometimes we want to mock the behavior for any argument of the given type, in that case, we can use Mockito argument matchers. Mockito argument methods are defined in org.

ArgumentMatchers class as static methods. All the below assertions will pass in this case:. When we use argument matchers, then all the arguments should use matchers. If we want to use a specific value for an argument, then we can use eq method.

Mockito org. AdditionalMatchers class provides some rarely used matchers. We can also check for equality of arrays. Mockito argument matchers can be used only with when and verify methods.

Mockito argument matcher methods are very useful in stubbing behaviors in a generic way. There are many methods to cover almost all the requirements. Your email address will not be published. I would love to connect with you personally. You can look at more Mockito examples from our GitHub Repository. Prev Mockito Spy - Partial Mock. Pankaj I love Open Source technologies and writing about my experience about them is my passion. Follow Author.If you want to mock static methods, you need to use PowerMockito.

Much like Mockitowe make use of similar annotations, as shown:. This is the class under test.

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In this lesson with Mockito, we will learn what is at the core of Mockito, which surprisingly is, mocks! Mock is an object that has predefined answers to method executions made during the test and has recorded expectations of these executions. Steps for creating Mockito TestNG example.

powermockito mock static method with parameters

Step 1: Create a simple java maven project. Overview Mockito is a powerful, open-source Mocking framework in Java. The features it provides for unit-testing is inevitably unique and important, nonetheless, ease out a lot of work for developers while writing unit test cases. Like stubbing or testing private, final […]. TestNG is an open source automated testing framework which is meant to perform unit, functional, end-to-end, integration testing.

Based on the website, TestNG is a testing framework inspired from JUnit and NUnit but introducing some new functionalities that make it more powerful and easier to use like Annotation, Support […]. In this lesson with Mockito, we will use another framework for complete testing, known as JUnit. According to JUnit website, JUnit is a simple framework to write repeatable tests.

It is an instance of the xUnit architecture for unit testing frameworks. With Mockito, creating mock objects is very easy. It provides many simple annotations to […]. In this lesson on Spy in Mockito, we will see how Spies differ from Mocks and how are these used. See here for […]. In this lesson, we will study Mockito, a full fledged framework in Java to create test doubles or mocks. Introduction Mockito is an Open Source Mocking framework in Java and provides easy ways to create test doubles, also referred to as mocks in further writing.

Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Start Learning. RunWith.

PrepareForTest.

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PowerMockRunner. RunWith PowerMockRunner. Assert. Test. PowerMockito. PrepareForTest StringUtil.Powermockito doNothing for method with arguments, mockStatic Resource. I've successfully mocked another class in a similar way, but this one is proving more stubborn. It seems that if the mocked method contains a method call on one of the passed in arguments the static method is not mocked and the test breaks. PowerMock junit runner lets you even mock static void and normal static calls.

Using PowerMockito to mock method with void return-type: "invalidSince you are trying to mock method which returns void, you simply can't call it inside when method. This is because PowerMockito. How do I mock a static method that returns void with PowerMockYou can do it the same way you do it with Mockito on real instances. Mockito mock void method with exception Below code snippet shows how to use doThrow method to mock void methods with the exception. Mocking Void Methods with Mockito, don't have any returning value to be matched for testing.

Sometimes you do come across snippets of code that prove to be tricky while writing their JUnit tests. One such scenario is the case of static void call, though some people would argue to extract the static void call into a separate method but that is old-school.

Mocking Void Methods with Mockito, 2. Simple Mocking and Verifying. For example, Mockito. The method belongs to a instance which is a spy. I am aware the fact I need to do this suggests bad code but I am working with an old project converting the unit tests from one testing framework to another. For stubbing private method behavior, we have to use PowerMock. For e. CreateMock A. Using Mockito: Matching multiple arguments in a private staticAs per Is it possible to use partial mocking for private static methods in PowerMock?

The private method signature is. Mocking of Private Methods Using PowerMock, For exhaustive unit testing of the method, we'd need to mock private methods. Post summary: How to mock private method with PowerMock by using spy object. This post is part of PowerMock series examples.

Mock private method. In some cases, you may need to alter the behavior of private method inside the class you are unit testing.

Spring Boot Testing Tutorial - Part 1 - Unit Testing with JUnit 5 and Mockito

I am aware the doNothing method only works with void methods. Is there a way to get the same behaviour with a method that returns something?

Thank you! How to mock void methods?Generally speaking, mocking private and static methods come under the category of unusual mocking. Having said that, there still exists support for Mocking private and static methods by few unit testing frameworks like PowerMockito and not directly by Mockito.

Mockito provides full support for mocking void methods, which we will see with examples in this article. For Mockito, there is no direct support to mock private and static methods. Mockito, in my opinion intentionally does not provide support for these kinds of mocks, as using these kinds of code constructs are code smells and poorly designed code.

Powermock extends capabilities of other frameworks like EasyMock and Mockito and provides the capability to mock static and private methods. For the sake of this article, we are going to write examples with the Mockito extension for power mock. In order to include the Mockito library in gradle based projects, below are the libraries to be included:. Powermock-api-mockito2 — The library is required to include Mockito extensions for Powermockito.

Powermock-module-junit4 — Module is required to include PowerMockRunner which is a custom runner to be used for running tests with PowerMockito. An important point to note here is that PowerMock does not support Junit5 test runner.

powermockito mock static method with parameters

Hence the tests need to be written against Junit4 and the tests need to be executed with PowerMockRunner. Mocking private methods, which are called internally from a method under test can be unavoidable at certain times. For this Example, the class under test is created as a spy instance with mocking on few interface invocations and private method invocation. This annotation tells powerMockito to prepare certain classes for testing.

These will be mostly those classes that need to be Bytecode manipulated. Complete Test Sample: Continuing the same example from the previous articles, where priceCalculator has some mocked dependencies like itemService, userService etc. We have created a new method called — calculatePriceWithPrivateMethod, which calls a private method inside the same class and returns whether the customer is anonymous or not.

When a method under test, involves using a static method from the same class or from a different classwe will need to include that class in prepareForTest annotation before the Test or on the test class.

For Example : Suppose you change your password for your internet banking account, once the change is successful you receive notification over your email.

Stubbing void methods i. It requires the stub to be set up using the above methods as per the test expectations. Also, please note that all the void method calls are by default mocked to doNothing. Hence, even if an explicit mock setup is not done on VOID method calls, the default behavior is still to doNothing.

Using PowerMock to Mock Static Methods

This method calculates the sum of scores as input and calls a void method updateScores on databaseImplementation instance.

For Example : Set up mock like this:. This gives an added verification of arguments that the method was called with. For void methods, mockito provides a special function called doCallRealMethod which can be used when you are trying to set up the mock. What this will do, is call the real void method with the actual arguments. As shown in the example above, assume both PriceCalculator and DiscountCategoryFinder are final classes that need to be mocked.

Using PowerMockito to Mock Final and Static Methods in Java Unit Testing

Both of these can be mentioned as an array of classes in PrepareForTest annotation and can be stubbed in the test method.In a recent blog, I tried to highlight the benefits of using dependency injection and expressing the idea that one of the main benefits of this technique is that it allows you to test your code more easily by providing a high degree of isolation between classes, and coming to the conclusion that lots of good tests equals good code.

PowerMock is a mocking framework that extends other mocking frameworks to provide much needed additional functionality. I, like many other bloggers and writers, usually present some highly contrived scenario to highlight the problem. PowerMock can do lots more, such as mocking constructors and private method calls. More on that later perhaps Static Methods Are Death to Testability.

Use Mock Objects Judiciously. See the original article here. Thanks for visiting DZone today. Edit Profile. Sign Out View Profile. Over a million developers have joined DZone. What happens when you aren't able fo fall back on dependency injection? Take a look at this example of how PowerMock can help. Like Join the DZone community and get the full member experience.

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PowerMock, Features and Use Cases PowerMock is a mocking framework that extends other mocking frameworks to provide much needed additional functionality.

Locale; import java. MissingResourceException; import java. ResourceBundle; import org. Before; import org. Test; import org. RunWith; import org. Mock; import org. PrepareForTest; import org. Opinions expressed by DZone contributors are their own. Java Partner Resources.Join Stack Overflow to learn, share knowledge, and build your career. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

I'm trying to test a class which uses a calculator class with a number of static methods. I've successfully mocked another class in a similar way, but this one is proving more stubborn. It seems that if the mocked method contains a method call on one of the passed in arguments the static method is not mocked and the test breaks. Removing the internal call is clearly not an option.

Is there something obvious I'm missing here? It seems there's some confusion about the question, so I've contrived a more 'realistic' example.

This one adds a level of indirection, so that it doesn't appear that I'm testing the mocked method directly. The SmallCalculator class is unchanged:. Here's the final code which works.

powermockito mock static method with parameters

I've tested this approach in the original code as well as the contrived example and it works great. When using any String.

Mocking Private, Static and Void Methods Using Mockito

As a result you get an exception. Note, this explains why you get an exception, however you need to review the way you test your method, as explained in other comments and answers.

Learn more. PowerMockito mocking static method fails when calling method on parameter Ask Question. Asked 5 years, 6 months ago.

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Active 5 years, 6 months ago. Viewed 34k times. Here's a condensed version which behaves the same way Test; import org.