mockito mock method that throws exception

In most cases when-then is used because it provides more readability with return type validation. Any way to avoid that? Asking for help, clarification, or responding to other answers. To learn more, see our tips on writing great answers. Solution 2. Stubbing voids requires different approach from Mockito#when(Object) because the compiler does not like void methods inside brackets. Just remove the JUnit 5 import statements and add below imports to change testing framework from JUnit to TestNG. With Mockito, you create a mock, tell Mockito what to do when specific methods are called on it, and then use the mock instance in your test instead of the real thing. I think you can add this to a method signature. 1. Mock will be created by Mockito. For Mockito, there is no direct support to mock private and static methods. Sign up for Infrastructure as a Newsletter. You're already mocking it. Below are the steps we need to take to create the project. junit 4.13: JUnit is a unit testing framework for Java, created by Erich Gamma and Kent Beck. This method returns a MockedStatic object for our type, which is a scoped mock object. In response, it should contain status code 200 and the body should have "application/json" media type. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Can the Spiritual Weapon spell be used as cover? This tutorial illustrates various uses of the standard static mock methods of the Mockito API. Void methods can be used with Mockito's doNothing (), doThrow (), and doAnswer () methods, making mocking and verifying intuitive: However, doNothing () is Mockito's default behavior for void methods. Why does awk -F work for most letters, but not for the letter "t"? Then you call the method that you want to test and assert that you get the expected result. 2. By using this website, you agree with our Cookies Policy. Prerequisites. Mockito test a void method throws an exception. If dark matter was created in the early universe and its formation released energy, is there any evidence of that energy in the cmb? Mockito.when (Showing top 20 results out of 18,351) How to verify that a specific method was not called using Mockito? I'm using org.mockito:mockito-android:2.16. . To learn more, see our tips on writing great answers. excel spring boot main null It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Using mockito to test methods which throw uncaught custom exceptions, The open-source game engine youve been waiting for: Godot (Ep. It specifies the exceptions that a method can throw to the caller and does not handle itself. How to properly visualize the change of variance of a bivariate Gaussian distribution cut sliced along a fixed variable? Mockito provides following methods that can be used to mock void methods. 4. @Captor Annotation in Mockito with Example java junit spring spring . How to troubleshoot crashes detected by Google Play Store for Flutter app, Cupertino DateTime picker interfering with scroll behaviour. PowerMockito.spy (FlowCopyParamsBusinessManager.class . By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. MathApplication makes use of calcService using its add method and the mock throws a RuntimeException whenever calcService.add() method is invoked. 2023 DigitalOcean, LLC. Example Project. The first 2 static calls works fine (if i comment out 3rd), but the last one ( User.findById(long id) ) throws exception while it is called in 'Mockito.when' method. When a mock class generated with @GenerateNiceMocks receives a method call which does not match any method stub created with the when API, a simple, legal default value is returned. Making statements based on opinion; back them up with references or personal experience. 6 When to mock and assert a thrown exception in Java? Thanks for contributing an answer to Stack Overflow! Book about a good dark lord, think "not Sauron". - mock method to do not throw an exception 2018-09-26 07: . But I think your question is really asking about how to get the code to throw the exception in the first place. You can download the complete project code from our GitHub Repository. The number of distinct words in a sentence. Mockito provides following methods that can be used to mock void methods. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Thanks for contributing an answer to Stack Overflow! Mockito provides following methods that can be used to mock void methods. It defines a clearly structured way of writing tests following three sections (Arrange, Act, Assert): given some preconditions (Arrange) when an action occurs (Act) then verify the output (Assert). Here's an example of how you can use these methods to mock and assert a thrown exception: In this example, the doThrow() method is used to set up the mock to throw a RuntimeException with the message "error" when the foo() method is called. How to mock void methods with mockito - there are two options: doAnswer - If we want our mocked void method to do something (mock the behavior despite being void). In this tutorial we continue by showing how to unit test this spring mvc rest service using JUnit, Mockito and Spring Test (MockMVC). Example service class. If the dish is not the one customer is expecting then it will throw WrongDishException. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? In this article, we presented how to configure the method to throw an exception using the Mockito framework. In Mockito method are mocked using 'when-then' or 'do-when'. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Mockito How to mock and assert a thrown exception, The open-source game engine youve been waiting for: Godot (Ep. With Mockito, you create a mock, tell Mockito what to do when specific methods are called on it, and then use the mock instance in your test instead of the real thing. 2. Thanks for contributing an answer to Stack Overflow! Take your code as an example. Check the Java API for List. Mockito. Mockito will fail at runtime with the somewhat misleading, generic message: This may lead you to believe that checked exceptions in general are unsupported, but in fact Mockito is only trying to tell you that this checked exception isn't valid for this method. Notice that return null statement is required since we are mocking void method. We can also configure Spy to throw an exception the same way we did with the mock: 6. I'm trying the following. It is not clear if you want to mock an method to throw an exception or you are getting an exception when mocking a method. How to handle multi-collinearity when all the variables are highly correlated? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. doNothing () : Completely ignore the calling of void method, this is default behavior. But still I will show you here how to unit test your private methods in Java and Spring applications. @InjectMocks Annotation in Mockito with Example Overview. Click 'Finish'. How to use. How to print and connect to printer using flutter desktop via usb? Instead of using mock(class) here we need to use Mockito. -ChatGPT . Java (JVM) Memory Model - Memory Management in Java, Simple and reliable cloud website hosting, New! In the 'Project name' enter 'MockitoThenReturnExample'. Best Java code snippets using org.mockito. Mockito provides the capability to a mock to throw exceptions, so exception handling can be tested. Mockito: Java - Is it possible to Change a variable value used in an InjectMocks class? this approach is unacceptable for case when youre testing method of an object that has some state. List findByAppli (String application, String sourcePattern) In my code, when i call this method findByAppli, i would like to return a list of FlowCopyParams. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); "http://www.w3.org/2001/XMLSchema-instance", "http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd", * Method Exception Throwing testing using Mockito, * Test for non-void Return Type method with Exception, nonVoidMethodThrowingExceptionMockitoTest, * Test for void Return Type method with Exception, * Configuring Spy to throw an exception the same way we've done with the mock, nonVoidMethodThrowingExceptionWithSpyMockitoTest. Should I include the MIT licence of a library which I use from a CDN? DigitalOcean makes it simple to launch in the cloud and scale up as you grow whether youre running one virtual machine or ten thousand. In this post, We will learn How to throw an Exception using Mockito, Lets try to understand the above concept using a demo project, What is Mocking? What are the effects of exceptions on performance in Java? In the testGetAllEmployee () method, we have a GET type request therefore we have called the get () method. If two overloaded methods within the same class are being stubbed with strict stubbing rule applied, PotentialStubbingProblem occurs. However, you can annotate the function with, This check is enforced since the release of. Use Mockito to mock some methods but not others, Mockito test a void method throws an exception, Mockito - NullpointerException when stubbing Method. pom.xml . thenThrowthenAnswer MockFake mockito . Why do we kill some animals but not others? @Olov . Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. org.mockito.Mockito. The error is displayed for: Assume addUser() method in business class never catches any exception and rethrowing is not done. I have a method which can throw 11 different exceptions (it's an 3rd party dependency), so the list of thrown exceptions get ridiculously long. I was trying to mock a method findById which was not directly in User.class but in GenericModel.class which User extends. Launching the CI/CD and R Collectives and community editing features for How do I test a class that has private methods, fields or inner classes? For Kotliners who want to (1) use that seamlessly as an extension function and (2) be able to pass several args like, Just what I was looking for, can throw any Exception other than. While my real code wasn't actually using List, your answer applies for that method call as well. Is something's right to be free more important than the best interest for its own species according to deontology? How to mock interface using Mockito example? 2. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. When you create the mocked List, Mockito will use the definition of List.class to creates its mock. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Lets create a simple class with a void method that we will mock in our test classes. How did StorageTek STC 4305 use backing HDDs? Retrieve the current price of a ERC20 token from uniswap v2 router using web3js. A Computer Science portal for geeks. Maybe it was IntelliSense. So instead of when-thenReturn , you might type just when-then. How to Configure Multiple Data Sources in a Spring Boot? It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. powermockito.stub_mock ,. extra: Mocktio will not complain if you doThrow an a method without any throwables, but you will also get this exception, For Kotliners: Kotlin doesn't have checked exceptions, so you cannot normally declare (in the function signature) that the function throws an exception. Start Here; . The verify() method is then used to verify that the foo() method was called on the mock. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Mockito series . Each unit test can contain different mocked data to validate different scenario's. Mockito is a great mocking framework which . Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). To mock and assert a thrown exception in Mockito, you can use the doThrow() method and the verify() method. doThrow() : We can use doThrow() when we want to stub a void method that throws exception. In the following code, . How to handle multi-collinearity when all the variables are highly correlated? Note : Throw any defined exception other than Exception(). . The Mockito when() method expects a mock or spy object as the argument. Find centralized, trusted content and collaborate around the technologies you use most. As usual, code introduced in this article is available in our GitHub repository. Do German ministers decide themselves how to vote in EU decisions or do they have to follow a government line? If a law is new but its interpretation is vague, can the courts directly ask the drafters the intent and official interpretation of their law? You get paid; we donate to tech nonprofits. Open Eclipse. If you want to do that, you need to create an instance or have a bean of that type, but not a mock. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Everything was correct until I tried to mock a static method which throws exception only (and do nothing else). This is the default and recommended . rev2023.3.1.43269. Launching the CI/CD and R Collectives and community editing features for PowerMock UnfinishedStubbingException error on final class, PowerMockito mock single static method and return object, Trying to mock static system class with PowerMock gives VerifyError, Mockito test a void method throws an exception, java.lang.ExceptionInInitializerError when mocking static method using EasyMock+PowerMock, Mock final method in inner class with PowerMockito, How to mock the static method with mockito to do unit test, PowerMock won't mock static method to throw an Exception in a Spring-Boot application, PowerMockito mock static didn't work correctly. To learn more, see our tips on writing great answers. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. After the test, you can query the mock to see what specific methods were called or check the side effects in the form of changed state. How do you mock a method to throw an exception? If you continue to use this site we will assume that you are happy with it. That's why you have unnecessary Mockito stubbings. Mockito provides following methods that can be used to mock void methods. The behavior you are specifying with the when(list.get(0)).thenThrow(new SomeException()) doesn't match the method signature in List API, because get(int index) method does not throw SomeException() so Mockito fails. rev2023.3.1.43269. // Set up the mock to throw an exception when the foo() method is called, // Verify that the foo() method was called on the mock, // Assert that the exception message is correct. As we can also see, the Exception message even describes what a correct invocation should look like. //add the behavior to throw exception doThrow (new Runtime Exception ("divide operation not implemented")) .when (calcService).add (10.0,20.0); Here we've added an exception clause to a mock object. Note that we could not use the statement when().thenThrow() for methods that do not return any value. Here in the test class I am mocking the service layer class with @Mock attribute and injecting it. Java ,java,spring-boot,mockito,Java,Spring Boot,Mockito,Spring Launching the CI/CD and R Collectives and community editing features for How do you assert that a certain exception is thrown in JUnit tests? Unit testing is a software testing method to test individual units of source code. Connect and share knowledge within a single location that is structured and easy to search. Save my name, email, and website in this browser for the next time I comment. This is the service method. Other answers have addressed the general problem of how to write a unit test that checks that an exception is thrown. Best Java code snippets using org.mockito. Why do I get an error "package org.mockito.runners does not exist"? Mockito Void Method Example. Partner is not responding when their writing is needed in European project application. Java at least 8, Junit 5, PowerMock Core, Mockito, Spring Boot Starter Test Critical issues have been reported with the following SDK versions: com.google.android.gms:play-services-safetynet:17.0.0, Flutter Dart - get localized country name from country code, navigatorState is null when using pushNamed Navigation onGenerateRoutes of GetMaterialPage, Android Sdk manager not found- Flutter doctor error, Flutter Laravel Push Notification without using any third party like(firebase,onesignal..etc), How to change the color of ElevatedButton when entering text in TextField. So it won't call real method which throws exception, PowerMockito mock static method which throws exception, The open-source game engine youve been waiting for: Godot (Ep. For example the following works (and doesn't throw a MockitoException but actually throws a checked Exception as required here) using BDDMockito: given (someObj.some Method (stringArg1) ).will Answer ( invocation -> { throw new Exception ("abc msg"); }); The equivalent for plain Mockito . 7 How to test if an exception was thrown using Mockito? After the test, you can query the mock to see what specific methods were called or check the side effects in the form of changed state. Mocking Void Methods with Mockito Create a java class file named TestRunner in C:\> Mockito_WORKSPACE to execute Test case(s). Go to File=>New=>Java Project. - . Not the answer you're looking for? You are trying to tell Mockito to throw an exception SomeException() that is not valid to be thrown by that particular method call. Right click on the 'src' folder and choose New=>Package. Please tell me how to handle the exception scenario in the test case. Thank you. Use the Mockito "doAnswer" method or extend the "RuntimeException". Retrieve the current price of a ERC20 token from uniswap v2 router using web3js. And if you are not testing anything, then there is no need for stubbing. What tool to use for the online analogue of "writing lecture notes on a blackboard"? If you expect to get an exception you can test it like this: JUnit4, just enhance you @Test annotation: Thanks for contributing an answer to Stack Overflow! BDD encourages writing tests in a natural, human-readable language that focuses on the behavior of the application. Why are non-Western countries siding with China in the UN? Maybe you did it accidentally. Help me understand the context behind the "It's okay to be white" question in a recent Rasmussen Poll, and what if anything might these results show? When using JUnit 4, we can simply use the expected attribute of the @Test annotation to declare that we expect an exception to be thrown anywhere in the annotated test method. Furthermore the last bit about JPA doesn't seem to fit in anywhere, or at least it confused me greatly. Does With(NoLock) help with query performance? Mockito MockitoMockAPIMockitoByteBuddymockobjenesismockmockMockHandlerImplhandle Premium CPU-Optimized Droplets are now available. Mockito Verifying Method Calls Use 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. If you really want to do this, then have Mockito throw a new RuntimeException() or even better throw a new ArrayIndexOutOfBoundsException() since the API specifies that that is the only valid Exception to be thrown. What tool to use for the online analogue of "writing lecture notes on a blackboard"? Would the reflected sun's radiation melt ice in LEO? 2. Connect and share knowledge within a single location that is structured and easy to search. Let's test the MathApplication class, by injecting in it a mock of calculatorService. I implemented an Observer pattern but I can't mock it with Mockito because I don't know how . In this quick tutorial, well focus on how to configure a method call to throw an exception with Mockito. I found a solution. Should I include the MIT licence of a library which I use from a CDN? Finally, the exception is caught and the message is asserted to be "error". How can the mass of an unstable composite particle become complex? How to Change the Default Port of the Tomcat Server ? Suspicious referee report, are "suggested citations" from a paper mill? We can mock runInGround(String location) method inside the PersonTest class as shown below. However, if you throw a checked exception not declared in the method signature, e.g. What are some tools or methods I can purchase to trace a water leak? : an exception is thrown) then you know something went wrong and you can start digging. Here's an example of how you can use these methods to mock and assert a thrown exception: import static org.mockito.Mockito. How does a fan in a turbofan engine suck air in? . What are some tools or methods I can purchase to trace a water leak? Mockito. Then, we showed how to implement testing and mocking objects using Mockito. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Mockito and JUnit Integration Using Maven Example The problem is that you are stubbing, but not really testing anything. doThrow() if you want to throw an exception from the mocked void method. Configuring JNDI Data Source for Database Connection Pooling in Tomcat? How to load log4j2 xml file programmatically ? Consider having your @Test method simply declare the exceptions being thrown, or even declaring throws Exception. # x27 ; m using org.mockito: mockito-android:2.16. method which throws exception in EU decisions or do they to... Youre running one virtual machine or ten thousand a single location that is structured and easy to search throws... Validate different scenario & # x27 ; m using org.mockito: mockito-android:2.16. on! Opinion ; back them up with references or personal experience spring Boot the Server. Calcservice using its add method and the mock: 6 mockito mock method that throws exception ; Java project, we called. Cc BY-SA for help, clarification, or even declaring throws exception if... Trace a water leak when all the variables are highly correlated the problem is that get... Contains well written, well focus on how to properly visualize the change of of. Donothing ( ).thenThrow ( ) for methods that can be used to verify the! X27 ; project name & # x27 ; from the mocked List, Mockito will use statement. Declared in the method signature use doThrow ( ) for methods that can be used to mock private static! Or methods I can purchase to trace a water leak into your RSS reader, your,! Content and collaborate around the technologies you use most throw exceptions, so exception can. Mocked void method, this check is enforced since the release of is required since we mocking... Design / logo 2023 Stack Exchange Inc ; user contributions licensed under CC BY-SA even declaring throws.... Create a simple class with @ mock attribute and injecting it site design / logo Stack. When we want to stub a void method that you are stubbing but! ; user contributions licensed under CC BY-SA using mock ( class ) here need... Siding with China in the first place not responding when their writing needed! Personal experience we could not use the doThrow ( ) method code 200 and the mock to take create. A mock to throw an exception from the mocked List, Mockito use... Instead of using mock ( class ) here we need to use for the next time I comment and! This to a mock of calculatorService List, Mockito will use the of. Package org.mockito.runners does not exist '', or even declaring throws exception only ( do. And mocking objects using Mockito for: Assume addUser ( ) method, this default., mockito mock method that throws exception, and website in this article is available in our Repository. For: Assume addUser ( ): we can also configure Spy to throw exception! Throws exception only ( and do nothing else ) with China in the?... Did with the mock throws a RuntimeException whenever calcService.add ( ) when we want to throw an exception with.! Have to follow a government line, Reach developers & technologists worldwide in InjectMocks... When to mock void methods let 's test the mathapplication class, by in. Engine suck air in animals but not really testing anything a good dark lord, think not. Of exceptions on performance in Java static mock methods of the Tomcat?. To launch in the testGetAllEmployee ( ): we can also configure Spy to throw an exception a. When you create the mocked void method that we will mock in our GitHub Repository fixed variable the to! To this RSS feed, copy and paste this URL into your RSS reader is thrown ) then you the... By clicking Post your Answer mockito mock method that throws exception you can add this to a call!, which is a great mocking framework which and assert that you are not testing.! Desktop via usb and choose New= & gt ; package them up with references or personal experience most! Unstable composite particle become complex if you are stubbing, but not others questions tagged, Where developers & share... Tech nonprofits @ Captor Annotation in Mockito with Example Java JUnit spring.... # x27 ; m using org.mockito: mockito mock method that throws exception, well focus on how to the. Function with, this check is enforced since the release of capability to a method can to. Error `` package org.mockito.runners does not handle itself: 6 Java ( JVM ) Memory Model - Memory in. Exception handling can be used to mock a static method which throws exception `` error.. Finish & # x27 ; folder and choose New= & gt ; New= & ;. Which was not directly in User.class but in GenericModel.class which user extends when want! But still I will show you here how to configure the method to do not return any.! Java ( JVM ) Memory Model - Memory Management in Java, created by Erich Gamma Kent... Be tested explained computer science and programming articles, quizzes and practice/competitive programming/company interview questions be performed by the?. Token from uniswap v2 router using web3js subscribe to this RSS feed, copy paste. Java - is it possible to change a variable value used in an InjectMocks class the expected.. To handle multi-collinearity when all the variables are highly correlated get ( ) method expects a mock Spy... Testing framework from JUnit to TestNG youre running one virtual machine or thousand. Is invoked the message is asserted to be free more important than the best interest for its species! You get paid ; we donate to tech nonprofits logo 2023 Stack Exchange Inc ; user contributions licensed under BY-SA... To vote in EU decisions or do they have to follow a government line tips on writing answers! Import statements and add below imports to change the default Port of the Mockito API declared in &... Jpa does n't seem to fit in anywhere, or responding to other answers have the..., which is a scoped mock object, copy and paste this URL into your RSS reader Java... Because it provides more readability with return type validation asking for help, clarification, or at least it me. Integration using Maven Example the problem is that you get the code to throw an 2018-09-26! Feed, copy and paste this URL into your RSS reader is asserted to ``... Not responding when their writing is needed in European project application next time I comment get! User.Class but in GenericModel.class which user extends from Mockito # when ( ) is. Caught and the mock up as you grow whether youre running one virtual machine or thousand... We did with the mock Memory Management in Java, created by Erich Gamma and Kent Beck this is. Exchange Inc ; user contributions licensed under CC BY-SA ( 28mm ) + GT540 24mm! With Example Java JUnit spring spring writing is needed in European project application since. Since we are mocking void method, we have called the get ( ) if you are not testing.! Simple and reliable cloud website hosting, New content and collaborate around technologies! Design / logo 2023 Stack Exchange Inc ; user contributions licensed under CC BY-SA since the release of available our. Add below imports to change a variable value used in an InjectMocks class package org.mockito.runners does not like methods! Our type, which is a great mocking framework which response, it should contain status code 200 and mock! With strict stubbing rule applied, PotentialStubbingProblem occurs directly in mockito mock method that throws exception but in GenericModel.class which extends. Sources in a spring Boot of source code Cookies policy what a correct invocation should look like, should! Query performance is really asking about how to vote in EU decisions or do they to. Is used because it provides more readability with return type validation privacy policy and cookie policy never any... When all the variables are highly correlated type validation and assert that you are happy with.. Method simply declare the exceptions being thrown, or even declaring throws exception other questions,. The body should have & quot ; media type GenericModel.class which user extends that some... Illustrates various uses of the standard static mock methods of the Mockito & quot ; method extend. Do they have to follow a government line print and connect to printer using Flutter desktop via usb and verify! Here how to configure Multiple Data Sources in a turbofan engine suck air in reflected 's! Be free more important than the best interest for its own species according to deontology in,. Which is a great mocking framework which JPA does n't seem to fit in,! And collaborate around the technologies you use most consider having your @ test simply! When ( object ) because the compiler does not exist '' `` suggested citations '' from CDN... Exception in Mockito with Example mockito mock method that throws exception JUnit spring spring finally, the exception scenario in the?. Project application other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach &... Throws a RuntimeException whenever calcService.add ( ): we can mock runInGround ( String location ) method is used! Void methods applies for that method call as well below are the effects of exceptions on performance Java! Scenario in the test case then there is no need for stubbing, this check is since... Licence of a ERC20 token from uniswap v2 router using web3js get )! Datetime picker interfering with scroll behaviour, Mockito will use the Mockito API and well explained computer science programming. Answer, you agree with our Cookies policy I use from a CDN not others: any. Tire + rim combination: CONTINENTAL GRAND PRIX 5000 ( 28mm ) + GT540 ( 24mm ) sliced along fixed. Makes it simple to launch in the test class I am mocking the service class..., are `` suggested citations '' from a CDN not handle itself to trace a water?... Terms of service, privacy policy and cookie policy we are mocking method...

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mockito mock method that throws exception