mockito throw exception on void method

Theoretically Correct vs Practical Notation. void method Find centralized, trusted content and collaborate around the technologies you use most. 4. By adding another test ( nonExistingUserById_ShouldThrow_IllegalArgumentException ) that uses the faulty input and expects an exception you can see whether your method does what it is supposed to do Void method is mostly mocked to check if it is called with correct parameters, https://javadoc.io/static/org.mockito/mockito-core/3.3.3/org/mockito/Mockito.html#12, For mocking void method when-then mechanism of mockito does not work because it needs return value, Void methods can be handled using doNothing(), doAnswer(), doThrow() or doCallRealMethod(), For mocked object doNothing is the default behavior for every method. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Answer: Here is a java example that uses Mockito to test a method that throws an exception. What is the point of Thrower's Bandolier? If you're using JUnit 4, you can annotate your test with, to assert that an exception has occured. In test testEatUsingDoNothing, we replace stubVoid() with doNothing() and when(). Making statements based on opinion; back them up with references or personal experience. We will present two approaches: one for methods that returns some value and one for void methods - there are some differences in the implementation. void method throws Exception For instance, I need to cover the scenario where there are exceptions thrown by cacheWrapper. in Mockito Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. Using indicator constraint with two variables. I'm using mockito in a junit test. To do this we make use of doThrow () method of Mockito class. 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. doThrow () : Throw exception when mocked void method is called doCallRealMethod () : Do not mock and call real method 1) Using doNothing () If we just want to completely ignore the void method call, we can use doNothing (). 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 Rules allow very flexible addition or redefinition of the behavior of each test method in a test class. By calling a method on a mock object we will mock that method call. doThrow (): We can use doThrow () when we want to stub a void method that throws exception. Let's take an example where we will throw InvalidParamException when updateName() method is called with null id. Comment . (adsbygoogle = window.adsbygoogle || []).push({}). Make the exception happen like this: when (obj.someMethod ()).thenThrow (new AnException ()); Verify it has happened either by asserting that your test will throw such an exception: @Test (expected = AnException.class) Or by normal mock verification: verify (obj).someMethod (); mockito. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. I've never heard of catch-exception, but it doesn't exactly seem like an up-to-date library: the last update to the main source code (at the time of writing) was on May 3 2015. In this article, we will show how to configure the method call to throw an exception using Mockito. Browse Library. @pringi Thanks, I see that the question concerned both mocking an exception and catching it. What this will do, is call the real void method with the actual arguments. Mockito Below you can find the interactions that this page has had using WebMention. It does not store any personal data. this approach is unacceptable for case when you're testing method of an object that has some state. 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 Mockito provides following methods that can be used to mock void methods. 4 When to use dothrow in a Mockito method? How can I mock a void method to throw an exception? throw exception Mocking Private, Static and Void Methods He works as a principal Engineer in the logistics domain. 2. How can I create an executable/runnable JAR with dependencies using Maven? Mocking a Void Method with EasyMock Why did Ukraine abstain from the UNHRC vote on China? Has this content helped you? Mockito - Stubbing methods if the method someMethod() return type is void, then it does not work like this. One of the most important point to note here is that, we can not just mock void method using when-then mechanism of mockito. Void method throws an exception WebIf this method fails (e.g. Join them now to gain exclusive access to the latest news in the Java world, as well as insights about Android, Scala, Groovy and other related technologies. How do I test a class that has private methods, fields or inner classes? doThrow () : Throw exception when mocked void method is called doCallRealMethod () : Do not mock and call real method 1) Using doNothing () If we just want to completely ignore the void method call, we can use doNothing (). But opting out of some of these cookies may affect your browsing experience. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Stub void method Using deprecated API stubVoid 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" ); } Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. Let's take an example, we have a UserService class. Mockito rev2023.3.3.43278. Using mockito, you can make the exception happen. doThrow() : We can use doThrow() when we want to stub a void method that throws exception. Mockito How to mock and assert a thrown exception? To learn more, see our tips on writing great answers. Mockito provides following methods that can be used to mock void methods. Mockito: How to mock a void method call doThrow() : We can use doThrow() when we want to stub a void method that throws exception. Exception How do I fix failed forbidden downloads in Chrome? worked for meAlso we can check the exception message as well.assertThatThrownBy(() -> myService.sumTingWong("badArg")).hasMessage("test") .isInstanceOf(IllegalArgumentException.class); I also prefer to use the @Rule, because this way I can test for expected message or cause or other stuff pertaining to the exception. Mockito this does not work if the method doSomething() return type is void? doThrow() : We can use doThrow() when we want to stub a void method that throws exception. Didn't worked because raised an exception with this error message: java.lang.AssertionError: Unexpected method call putInSharedMemory("foo", com.company.domain.Entity@609fc98). Now when we call customer.eat(dish), it doesnt throw any exception. 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" ); } If you ever wondered how to do it using the new BDD style of Mockito: And for future reference one may need to throw exception and then do nothing: In my case, I wanted to throw an explicit exception for a try block,my method block was something like below, I have covered all the above exceptions for sonar coverage like below. Mockito - Stubbing methods Thanks for contributing an answer to Stack Overflow! Or has it taught you something new you'll be able to re-use daily? doAnswer (): We can use this to perform some operations when a mocked object method is called that is returning void. 3. mockito. Source: (Example.java) import org.mockito.Mockito; import static org. All trademarks and registered trademarks appearing on Java Code Geeks are the property of their respective owners. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Ram holds a master's degree in Machine Design from IT B.H.U. 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 Can Mockito capture arguments of a method called multiple times? And my client class (you could say it looks like this): I'm creating unit tests for SomeClient#getEntity method and have to cover all scenarios. Any ideas how I can get the method to throw a specified exception? mockito Find centralized, trusted content and collaborate around the technologies you use most. The cookie is used to store the user consent for the cookies in the category "Analytics". If we want to throw an exception when method is called, we can use doThrow() method of mockito. doThrow() : We can use doThrow() when we want to stub a void method that throws exception. Why do small African island nations perform better than African continental nations, considering democracy and human development? This cookie is set by GDPR Cookie Consent plugin. Unfortunately this doesn't work, as we receive the following compilation error: src/test/java/me/jvt/hacking/DataClassValidatorTest.java:24: error: 'void' type not allowed here Mockito.when (sut.doTheThing ()).thenThrow (new RuntimeException ("foo")); And in IntelliJ, we we see the following cryptic error: Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. The project has dependencies for PowerMock and EasyMock. 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. Mocking Exception Throwing using Mockito void method Here, we configured an add () method which returns void to throw IllegalStateException when called. The thing is that stubbing a Unit method only makes sense if you wanna make it throw an exception, otherwise the only thing you want out of it is to verify it was called as you mentioned.

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