mockito throw exception on void method

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 Now, if we don't want to simulate the processing of this method, this call itself is sufficient to mock the method. Is it possible to rotate a window 90 degrees if it has the same length and width? Linear Algebra - Linear transformation question, Styling contours by colour and by line thickness in QGIS, Identify those arcade games from a 1983 Brazilian music video, Acidity of alcohols and basicity of amines. in Mockito this approach is unacceptable for case when you're testing method of an object that has some state. 3. WebUse doThrow() when you want to stub the void method to throw exception of specified class.. A new exception instance will be created for each method invocation. Difficulties with estimation of epsilon-delta limit proof. We will present two approaches: one for methods that returns some value and one for void methods - there are some differences in the implementation. 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 Mockito Hello World Example, we have learnt how to stub a non-void method that returns something. mockito. Also, no need for any kind of .replay() with Mockito, which is very nice! Is the God of a monotheism necessarily omnipotent? Heres a simple dictionary class well use in these examples: Have a look at how to test if an exception was thrown using JUnit. How do you assert that a certain exception is thrown in JUnit tests? Can airtags be tracked from an iMac desktop, with no iPhone? If the dish is too spicy then the overloaded eat(spice) method is going to throw a RuntimeException. If it throws MyException during the first method call (in the preparation stage) then it should fail the test. doThrow() : We can use doThrow() when we want to stub a void method that throws exception. 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. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Hence, if you don't want to verify parameters, use of doNothing is completely optional. 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. Answer: Here is a java example that uses Mockito to test a method that throws an exception. 4.2. How do I test a class that has private methods, fields or inner classes? MathApplication makes use of calcService using its add method and the mock throws a RuntimeException whenever calcService.add () method is invoked. 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 So, after calling Mockito.when, you should call (or do something that calls) that method in your unit test. WebVoid method throws an exception Question: Write a java program that uses Mockito on a method that returns a void and throws an exception. 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. JUnit 5: How to assert an exception is thrown? Non-Void Return Type First, if our method return type is not void we can use when ().thenThrow (): How can I mock a void method to throw an exception? In your test, first perform the action under test then call verify() not the other way around. WebIt doesn't return a value, so it throws an exception. Mockito test a void method throws an exception, Mockito Thread.class exception in try catch block does not improve coverage. We can stub a void method to throw an exception using doThrow (). 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 [ERROR] JUnit.mockException Expected exception: java.lang.Exception. Minimising the environmental effects of my dyson brain. Java: Can I Inject a runtime exception into an arbitrary class method at runtime? Let's take an example where we will throw InvalidParamException when updateName() method is called with null id. Mockito Answer: Here is a java example that uses Mockito to test a method that throws an exception. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. http://easymock.org/api/org/easymock/internal/MocksControl.html#andVoid--, Getting EasyMock mock objects to throw Exceptions, How Intuit democratizes AI development across teams through reusability. In this recipe, we will stub a void method. WebIf this method fails (e.g. Why are physically impossible and logically impossible concepts considered separate in terms of probability? Mockito is one of the most famous mocking framework used for writing unit tests. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Using Junit5, you can assert exception, asserts whether that exception is thrown when testing method is invoked. If you want to test the exception message as well you can use JUnit's ExpectedException with Mockito: If you're using JUnit 4, and Mockito 1.10.x Exception How to mock a void static method to throw exception with Powermock? Before I start with my example, a bit about my setup: .lepopup-progress-100 div.lepopup-progress-t1>div{background-color:#e0e0e0;}.lepopup-progress-100 div.lepopup-progress-t1>div>div{background-color:#bd4070;}.lepopup-progress-100 div.lepopup-progress-t1>div>div{color:#ffffff;}.lepopup-progress-100 div.lepopup-progress-t1>label{color:#444444;}.lepopup-form-100, .lepopup-form-100 *, .lepopup-progress-100 {font-size:15px;color:#444444;font-style:normal;text-decoration:none;text-align:left;}.lepopup-form-100 .lepopup-element div.lepopup-input div.lepopup-signature-box span i{font-size:15px;color:#444444;font-style:normal;text-decoration:none;text-align:left;}.lepopup-form-100 .lepopup-element div.lepopup-input div.lepopup-signature-box,.lepopup-form-100 .lepopup-element div.lepopup-input div.lepopup-multiselect,.lepopup-form-100 .lepopup-element div.lepopup-input input[type='text'],.lepopup-form-100 .lepopup-element div.lepopup-input input[type='email'],.lepopup-form-100 .lepopup-element div.lepopup-input input[type='password'],.lepopup-form-100 .lepopup-element div.lepopup-input select,.lepopup-form-100 .lepopup-element div.lepopup-input select option,.lepopup-form-100 .lepopup-element div.lepopup-input textarea{font-size:15px;color:#444444;font-style:normal;text-decoration:none;text-align:left;background-color:rgba(255, 255, 255, 0.7);background-image:none;border-width:1px;border-style:solid;border-color:#cccccc;border-radius:0px;box-shadow:none;}.lepopup-form-100 .lepopup-element div.lepopup-input ::placeholder{color:#444444; opacity: 0.9;} .lepopup-form-100 .lepopup-element div.lepopup-input ::-ms-input-placeholder{color:#444444; opacity: 0.9;}.lepopup-form-100 .lepopup-element div.lepopup-input div.lepopup-multiselect::-webkit-scrollbar-thumb{background-color:#cccccc;}.lepopup-form-100 .lepopup-element div.lepopup-input>i.lepopup-icon-left, .lepopup-form-100 .lepopup-element div.lepopup-input>i.lepopup-icon-right{font-size:20px;color:#444444;border-radius:0px;}.lepopup-form-100 .lepopup-element .lepopup-button,.lepopup-form-100 .lepopup-element .lepopup-button:visited{font-size:17px;font-weight:700;font-style:normal;text-decoration:none;text-align:center;background-color:rgba(203, 169, 82, 1);background-image:linear-gradient(to bottom,rgba(255,255,255,.05) 0,rgba(255,255,255,.05) 50%,rgba(0,0,0,.05) 51%,rgba(0,0,0,.05) 100%);border-width:0px;border-style:solid;border-color:transparent;border-radius:0px;box-shadow:none;}.lepopup-form-100 .lepopup-element div.lepopup-input .lepopup-imageselect+label{border-width:1px;border-style:solid;border-color:#cccccc;border-radius:0px;box-shadow:none;}.lepopup-form-100 .lepopup-element div.lepopup-input .lepopup-imageselect+label span.lepopup-imageselect-label{font-size:15px;color:#444444;font-style:normal;text-decoration:none;text-align:left;}.lepopup-form-100 .lepopup-element div.lepopup-input input[type='checkbox'].lepopup-checkbox-tgl:checked+label:after{background-color:rgba(255, 255, 255, 0.7);}.lepopup-form-100 .lepopup-element div.lepopup-input input[type='checkbox'].lepopup-checkbox-classic+label,.lepopup-form-100 .lepopup-element div.lepopup-input input[type='checkbox'].lepopup-checkbox-fa-check+label,.lepopup-form-100 .lepopup-element div.lepopup-input input[type='checkbox'].lepopup-checkbox-square+label,.lepopup-form-100 .lepopup-element div.lepopup-input input[type='checkbox'].lepopup-checkbox-tgl+label{background-color:rgba(255, 255, 255, 0.7);border-color:#cccccc;color:#444444;}.lepopup-form-100 .lepopup-element div.lepopup-input input[type='checkbox'].lepopup-checkbox-square:checked+label:after{background-color:#444444;}.lepopup-form-100 .lepopup-element div.lepopup-input input[type='checkbox'].lepopup-checkbox-tgl:checked+label,.lepopup-form-100 .lepopup-element div.lepopup-input input[type='checkbox'].lepopup-checkbox-tgl+label:after{background-color:#444444;}.lepopup-form-100 .lepopup-element div.lepopup-input input[type='radio'].lepopup-radio-classic+label,.lepopup-form-100 .lepopup-element div.lepopup-input input[type='radio'].lepopup-radio-fa-check+label,.lepopup-form-100 .lepopup-element div.lepopup-input input[type='radio'].lepopup-radio-dot+label{background-color:rgba(255, 255, 255, 0.7);border-color:#cccccc;color:#444444;}.lepopup-form-100 .lepopup-element div.lepopup-input input[type='radio'].lepopup-radio-dot:checked+label:after{background-color:#444444;}.lepopup-form-100 .lepopup-element div.lepopup-input div.lepopup-multiselect>input[type='checkbox']+label:hover{background-color:#bd4070;color:#ffffff;}.lepopup-form-100 .lepopup-element div.lepopup-input div.lepopup-multiselect>input[type='checkbox']:checked+label{background-color:#a93a65;color:#ffffff;}.lepopup-form-100 .lepopup-element input[type='checkbox'].lepopup-tile+label, .lepopup-form-100 .lepopup-element input[type='radio'].lepopup-tile+label {font-size:15px;color:#444444;font-style:normal;text-decoration:none;text-align:center;background-color:#ffffff;background-image:none;border-width:1px;border-style:solid;border-color:#cccccc;border-radius:0px;box-shadow:none;}.lepopup-form-100 .lepopup-element-error{font-size:15px;color:#ffffff;font-style:normal;text-decoration:none;text-align:left;background-color:#d9534f;background-image:none;}.lepopup-form-100 .lepopup-element-2 {background-color:rgba(226,236,250,1);background-image:none;border-width:1px;border-style:solid;border-color:rgba(216,216,216,1);border-radius:3px;box-shadow: 1px 1px 15px -6px #d7e1eb;}.lepopup-form-100 .lepopup-element-3 * {font-family:'Arial','arial';font-size:26px;color:#333333;font-weight:normal;font-style:normal;text-decoration:none;text-align:center;}.lepopup-form-100 .lepopup-element-3 {font-family:'Arial','arial';font-size:26px;color:#333333;font-weight:normal;font-style:normal;text-decoration:none;text-align:center;background-color:transparent;background-image:none;border-width:1px;border-style:none;border-color:transparent;border-radius:0px;box-shadow:none;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.lepopup-form-100 .lepopup-element-3 .lepopup-element-html-content {min-height:36px;}.lepopup-form-100 .lepopup-element-4 * {font-family:'Arial','arial';font-size:19px;color:#555555;font-weight:normal;font-style:normal;text-decoration:none;text-align:left;}.lepopup-form-100 .lepopup-element-4 {font-family:'Arial','arial';font-size:19px;color:#555555;font-weight:normal;font-style:normal;text-decoration:none;text-align:left;background-color:transparent;background-image:none;border-width:1px;border-style:none;border-color:transparent;border-radius:0px;box-shadow:none;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.lepopup-form-100 .lepopup-element-4 .lepopup-element-html-content {min-height:63px;}.lepopup-form-100 .lepopup-element-5 * {font-family:'Arial','arial';font-size:13px;color:#555555;font-weight:normal;font-style:normal;text-decoration:none;text-align:left;}.lepopup-form-100 .lepopup-element-5 {font-family:'Arial','arial';font-size:13px;color:#555555;font-weight:normal;font-style:normal;text-decoration:none;text-align:left;background-color:transparent;background-image:none;border-width:1px;border-style:none;border-color:transparent;border-radius:0px;box-shadow:none;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.lepopup-form-100 .lepopup-element-5 .lepopup-element-html-content {min-height:60px;}.lepopup-form-100 .lepopup-element-6 * {font-family:'Arial','arial';font-size:13px;color:#333333;font-weight:normal;font-style:normal;text-decoration:none;text-align:left;}.lepopup-form-100 .lepopup-element-6 {font-family:'Arial','arial';font-size:13px;color:#333333;font-weight:normal;font-style:normal;text-decoration:none;text-align:left;background-color:transparent;background-image:none;border-width:1px;border-style:none;border-color:rgba(216,216,216,1);border-radius:0px;box-shadow:none;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.lepopup-form-100 .lepopup-element-6 .lepopup-element-html-content {min-height:auto;}.lepopup-form-100 .lepopup-element-0 * {font-size:15px;color:#ffffff;font-weight:normal;font-style:normal;text-decoration:none;text-align:left;}.lepopup-form-100 .lepopup-element-0 {font-size:15px;color:#ffffff;font-weight:normal;font-style:normal;text-decoration:none;text-align:left;background-color:#5cb85c;background-image:none;border-width:0px;border-style:solid;border-color:#ccc;border-radius:5px;box-shadow: 1px 1px 15px -6px #000000;padding-top:40px;padding-right:40px;padding-bottom:40px;padding-left:40px;}.lepopup-form-100 .lepopup-element-0 .lepopup-element-html-content {min-height:160px;}. 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. For example, in test testEatUsingStubVoid(), we stub eat() to simply return without throwing an exception, we can do it using stubVoid() and toReturn(). mockito. Mockito.when(myService.doSomething()).thenThrow(new Exception("Cannot process")); then we will have following runtime exception: org.mockito.exceptions.base.MockitoException: Checked exception is invalid for this method! In this article, we will show how to configure the method call to throw an exception using Mockito. Exception as an Object void methods Mockito - Stubbing methods How to follow the signal when reading the schematic? But note that stubVoid() is deprecated so we wont use it any more. void method As with many other Java developers, I heavily utilise Mockito as a mocking framework for unit testing. Why are physically impossible and logically impossible concepts considered separate in terms of probability? Is it suspicious or odd to stand by the gate of a GA airport watching the planes? void methods Mockito provides following methods that can be used to mock void methods. 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. Let us together figure this out in the following blog using mockito. on Tue, 18 Jan 2022 15:28:31 UTC, and last updated on Tue, 18 Jan 2022 15:28:31 UTC. 2 How do you throw an exception in PowerMock? doThrow() : We can use doThrow() when we want to stub a void method that throws exception. I'm using mockito in a junit test. We will be testing simple ThrowingService that has two methods: In the following JUnit test we show how to change the behavior of the someVoidMethod(..) method in ThrowingService using Mockito: In the first test we used the Mockito statement doThrow().when().method() to configured someVoidMethod to throw IllegalArgumentException when called with argument 0. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? It doesn't return a value, so it throws an exception. Why is printing "B" dramatically slower than printing "#"? Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? @JB Nizet I totally agree with you but however if I write doThrow(new Exception()) instead of doThrow(Exception.class), I have the following error when I launch my test ; Expected exception com.company.project.exception.ElementNotFoundException but got org.mockito.exceptions.base.MockitoException: doThrow(new Exception()).when(object).voidMethod(any()); Thanks for posting this here; if the method returns a value : given(mockedObject.methodReturningAnObject()).willThrow(new Exception()); if the method doesn't return anything : willThrow(new Exception()).given(mockedObject).methodReturningVoid()); Explanation form javadoc : "Stubbing voids requires different approach from {@link Mockito#when(Object)} (or BDDMockito.given)because the compiler does not like void methods inside brackets", Mockito test a void method throws an exception, How to make mock to void methods with mockito, docs.mockito.googlecode.com/hg/latest/org/mockito/, How Intuit democratizes AI development across teams through reusability. Do throw exception for void method Mockito? 1 Answer Sorted by: 1 Firstly, your method deleteTableEsiti () never throws any exception. Mockito: Trying to spy on method is calling the original method. 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. 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. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. Is it possible to create a concave light? Mockito cacheWrapper.putInSharedMemory ("key", "value"); EasyMock.expectLastCall ().andThrow (new RuntimeException ()); Check: http://easymock.org/api/org/easymock/internal/MocksControl.html#andVoid-- 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. Written by Jamie Tanna Are you using EasyMock or Mockito? How do I test a class that has private methods, fields or inner classes? In this article, we will show how to configure the method call to throw an exception using Mockito. Mockito provides following methods that can be used to mock void methods. mockito void method throw exception @MariuszS response correctly answers what you are saying is unrelated to Mockito. Testers can reuse or extend one of the provided Rules below, or write their own. https://www.jvt.me/posts/2022/01/18/mockito-void-throw/ throw exception Not the answer you're looking for? Styling contours by colour and by line thickness in QGIS. How can I mock a void method to throw an exception? 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 (); How to tell which packages are held back due to phased updates, Redoing the align environment with a specific formatting. Void Methods What am I doing wrong here in the PlotLegends specification? 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. Making statements based on opinion; back them up with references or personal experience. Void Methods For this, we'll have to mock the method in such a way that it throws these exceptions. How do you get out of a corner when plotting yourself into a corner, Trying to understand how to get this basic Fourier Series. He is passionate about open source technologies and actively blogs on various java and open-source technologies like spring. For this, we'll have to mock the method in such a way that it throws these exceptions. The cookie is used to store the user consent for the cookies in the category "Performance". Invalid: java.lang.Exception: Cannot process at By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy.