PowerMockito is a superset (or more of a supplement) that can be used with both these frameworks. Stubbing void methods requires a different approach from when (Object) because the compiler does not like void methods inside brackets. I have tried lot of ways to do this but none of them work. This cookie is set by GDPR Cookie Consent plugin. We can't use when ().thenThrow () with void return type, as the compiler doesn't allow void methods inside brackets. Mockito test a void method throws an exception, Mockito Thread.class exception in try catch block does not improve coverage. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. WebTry this for stubbing void methods to throw exceptions: EasyMock: // First make the actual call to the void method. All in all the testing code is really bizarre, you seem to be using both easymock and (power)mockito Any reason why? When testing not void methods we could actually decide what approache is better for us, because both will work in the same way: In the following test class, we used the when().thenThrow() statement to configure the not void method to throw a different exception when called with argument zero. doCallRealMethod ().when (mockDatabaseImpl).updateScores ( anyString (), anyInt ()); In test testEatUsingDoNothing, we replace stubVoid() with doNothing() and when(). Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. import org.junit.jupiter.api.extension.ExtendWith; import org.mockito.junit.jupiter.MockitoExtension; import static org.assertj.core.api.AssertionsForClassTypes.assertThatThrownBy; +import static org.mockito.Mockito.doThrow; - when(sut.doTheThing()).thenThrow(new RuntimeException("foo")); + doThrow(new RuntimeException("foo")).when(sut).doTheThing(); assertThatThrownBy(sut::doTheThing).isInstanceOf(RuntimeException.class); https://www.jvt.me/posts/2022/01/18/mockito-void-throw/, Creative Commons Attribution Non Commercial Share Alike 4.0 International, 7a4a9cc5a8 on Tue, 18 Jan 2022 15:28:31 +0000. mockito throw exception void method java by DevPedrada on Dec 18 2020 Donate Comment 3 xxxxxxxxxx 1 doThrow(new Exception()).when(mockedObject).methodReturningVoid(); Source: stackoverflow.com Add a Grepper Answer Answers related to mockito void method throw exception throw void methods doThrow() : We can use doThrow() when we want to stub a void method that throws exception. After our previous blog on difference between thenReturn and thenAnswer mockito methods, we are back with yet another interesting blog on Mockito. Mockito provides following methods that can be used to mock void methods. None of your tested classes are final, you could just use a, @fge I'm not very skilled using any of these frameworks because I tend to write integration tests rather than pure unit tests. Mockito - Stubbing methods The cookie is used to store the user consent for the cookies in the category "Performance". This website uses cookies to improve your experience while you navigate through the website. How does claims based authentication work in mvc4? Browse Library. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, @AndyTurner I would argue that if you have more than one thing that could throw a. If you want your method to throw an exception, don't catch it, or catch it and throw a custom exception that wraps the original exception. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? How to verify that a specific method was not called using Mockito? Mockito + Catch-Exception + Assertj full sample, eu.codearte.catch-exception:catch-exception:2.0, http://blog.codeleak.pl/2015/04/junit-testing-exceptions-with-java-8.html, static.javadoc.io/org.mockito/mockito-core/2.23.4/org/mockito/, How Intuit democratizes AI development across teams through reusability. Mockito MathApplication makes use of calcService using its add method and the mock throws a RuntimeException whenever calcService.add () method is invoked. doThrow() : We can use doThrow() when we want to stub a void method that throws exception. In this method we call another void method. mockito Please read and accept our website Terms and Privacy Policy to post a comment. Surly Straggler vs. other types of steel frames. cacheWrapper.putInSharedMemory ("key", "value"); EasyMock.expectLastCall ().andThrow (new RuntimeException ()); Check: http://easymock.org/api/org/easymock/internal/MocksControl.html#andVoid-- Have you written a response to this post? Stubbing void methods requires a different approach from when (Object) because the compiler does not like void methods inside brackets. It has a void eat() method which the customer object will call when served with the dish. Do throw exception for void method Mockito? You can use Comment Parade. This cookie is set by GDPR Cookie Consent plugin. Asking for help, clarification, or responding to other answers. 2. As usual, code introduced in this article is available in our GitHub repository. Using Kolmogorov complexity to measure difficulty of problems? Originally, stubVoid() was used for stubbing void methods with exceptions. But note that stubVoid() is deprecated so we wont use it any more. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. Mockito: Trying to spy on method is calling the original method. Didn't worked because raised an exception with this error message: java.lang.AssertionError: Unexpected method call putInSharedMemory("foo", com.company.domain.Entity@609fc98). Why is printing "B" dramatically slower than printing "#"? Learn how to use AssertJ for performing assertions on exceptions. Mutually exclusive execution using std::atomic? Mockito's doCallRealMethod () can be used for void methods: @Test void whenAddCalledRealMethodCalled() { MyList myList = mock (MyList.class); doCallRealMethod ().when (myList).add (any (Integer.class), any (String.class)); myList.add ( 1, "real" ); verify (myList, times ( 1 )).add ( 1, "real" ); } Throwing What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? Sometimes I'll end up needing to write a test case which wants to mock a void-returning method, for instance to throw an exception: Unfortunately this doesn't work, as we receive the following compilation error: And in IntelliJ, we we see the following cryptic error: This is because Mockito can't mock a void as such, and instead we need to use doThrow(): This post's permalink is https://www.jvt.me/posts/2022/01/18/mockito-void-throw/ and has the following summary: The canonical URL for this post is This means we have work with the following methods to mock a void method: doThrow (Throwable) doThrow (Class) doAnswer (Answer) doNothing () doCallRealMethod () This is the class we will be using for the examples. To learn more, see our tips on writing great answers. Connect and share knowledge within a single location that is structured and easy to search. void method throws Exception Mockito void Method Example public void deleteCurrentlyLoggedInUser (Principal principal) { if (findLoggedInUser (principal) == null) { throw new UserAlreadyDeletedException (); } userRepository.delete (findLoggedInUser (principal)); } Here is findLoggedInUser: User findLoggedInUser (Principal principal) { return userRepository.findByUsername JUnit 5: How to assert an exception is thrown? throw exception In Mockito we can use different methods to call real method or mock void method. Mockito Mockito And to "mock" an exception with mockito, use, Mockito alone is not the best solution for handling exceptions, use Mockito with Catch-Exception, Updated answer for 06/19/2015 (if you're using java 8), Using assertj-core-3.0.0 + Java 8 Lambdas, Reference: http://blog.codeleak.pl/2015/04/junit-testing-exceptions-with-java-8.html. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Force Method to throw an exception in Mockito, Unit test: Simulate a timeout with Guzzle 5, Mock/Stub a RuntimeException in unit test, How to doThrow or thenThrow on method that returns void and throws an exception, I want to write a mockito test case for a spring boot service method. In this article, we will show how to configure the method call to throw an exception using Mockito. 2. For this, we'll have to mock the method in such a way that it throws these exceptions. Difficulties with estimation of epsilon-delta limit proof. void method Example Step 1 Create an interface called CalculatorService to provide mathematical functions File: CalculatorService.java Theoretically Correct vs Practical Notation. Why are physically impossible and logically impossible concepts considered separate in terms of probability? To do this we make use of doThrow () method of Mockito class. How i can stop call a method void with mockito? Mockito provides us with a verify()method that lets us verify whether the mock void method is being called or not. : an exception is thrown) then you know something went wrong and you can start digging. Mockito: How to mock a void method call Why do small African island nations perform better than African continental nations, considering democracy and human development? Testers can reuse or extend one of the provided Rules below, or write their own. Save my name, email, and website in this browser for the next time I comment. In mocking, for every method of mocked object doNothing is the default behavior. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Why do you need PowerMockito at all?
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mockito throw exception on void method