Have a question about this project? For example, to mock a function that takes a primitive long as parameter, instead of using any(), you should be more specific and replace that with any(Long.class) or Mockito.anyLong(). IMHO you need to add a @RunWith (some.mockito.TestSuiteIDontRememberName.class) annotated to the test class. Sign in Ed Webb's answer helped in my case. The most widely used annotation in Mockito is @Mock. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Adding MockitoAnnotations.initMocks(this); worked, my tests seem to be using my mocks, how would I go about explicitly telling my service to use my mocks? of the mocked class would not be executed. Here is a sample of what I think you could do if you are using mockito only and dont need to instantiate a spring container (used a single class for ease of example dont do this in actual code): If you need an example via Spring using MockBean or without and dependencies, let me know and I can post. Most of the people just forget to specify the test runner, running class for mocking. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Therefore, I would be inclined to close this issue as WontFix, unless @nguyenquoc you are mocking a non-java.lang. So I started writing tests for our Java-Spring-project. This annotation is a shorthand for the Mockito.mock() method. also, make sure the class and test method is public. { Null pointer exception when using Mockito to mock interface. So you are running your test and suddenly you see NullPointerException: You looked it up, and it seems your test is written correctly. Probably you don't know what to return, or you need to return an also mocked object instance but as such, it is impossible to repair your code without implementing something completely different to your intention. You might get NullPointerException exception when you try to mock object in your tests. @willa https://travis-ci.org/openmrs/openmrs-module-sync2/builds/604393280?utm_source=github_status&utm_medium=notification. A temporary workaround is to fork each test, though build times suffer somewhat. Why the obscure but specific description of Jane Doe II in the original complaint for Westenbroek v. Kappa Kappa Gamma Fraternity? It seems that creating a mock of a particular class/interface in a lot of tests from independent test classes exposes this problem. Did the drapes in old theatres actually say "ASBESTOS" on them? And instead, you can also try add. Have you tried to go this way? When this class that contains this mocking is run alone that the test is green in Eclipse and maven too. Use Mockito to mock some methods but not others, Mockito test a void method throws an exception. Asking for help, clarification, or responding to other answers. What's the difference between a mock & stub? It can also be an import problem, so make sure you have the appropriate imported package. Making statements based on opinion; back them up with references or personal experience. I have a class named Pinger Service which calls a HttpAdapter opening up HttpURLConnection and returning it, where getResponseCode is then called to find out if the URL was 200 or not. Could a subterranean river or aquifer generate enough continuous momentum to power a waterwheel for the purpose of producing electricity? It doesnt work for me always gives this error "dexcache == null (and no default could be found; consider setting the 'dexmaker.dexcache' system property)". Well occasionally send you account related emails. When I mock this class in java, I get a null pointer exception. -> at com.rosia.today.TodayPagePresenterTest.syncLocalOrders_OrderNotEmptySuccessTest(TodayPagePresenterTest.kt:67) Why refined oil is cheaper than cold press oil. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. BSMP. Thank you so much . return new GatewayResponse(HttpStatus.NO_CONTENT,product, Message.SUCCESS.getDesc()); So what I want to do is, to set: But no matter which when-clause I do, I always get a NullpointerException, which of course makes sense, because input is null. You will have to adapt to your environment/configuration. public void ControllerTest() @Service public class Service { @Autowired private Consumer<String, String> kafkaConsumer; public void clearSubscribtions () { kafkaConsumer.unsubscribe In my case I am mocking an interface, final is not involved. Well occasionally send you account related emails. I removed the mocking of Method, as suggested . Mockito provides the capability to a mock to throw exceptions, so exception handling can be tested. I was mocking Method too, but not in any test in error, not so easy to find, I have more than 300 in this project. Somehow, Intellij assumed I want to use, I somehow missed this line "MockitoAnnotations.initMocks(this); ". I hope this helps. Having the same problem using Junit 5 , I resolve it using : @ExtendWith(MockitoExtension.class) instead of @RunWith(MockitoJUnitRunner.class) . Much love! Not the answer you're looking for? When using JUnit 5 or above. MockitoJunitRunner will you create a Mock object based on the type you demand StockService in your guess. However, I dont see anywhere where you are disabling pull. In my case i forgot to initialize my variables effectively THANK YOU !! By clicking Sign up for GitHub, you agree to our terms of service and Thankyou Rammgarot. In this tutorial, we'll see common errors that lead to a NullPointerException on an Autowired field. every thing is fine just getting NullpointerException. For JUnit5 check, you are using proper imports also. Also when I try to mock another method from an object: There I also get a Nullpointer, because the method needs a variable, which isn't set. Connect and share knowledge within a single location that is structured and easy to search. @Mock Mockito: Trying to spy on method is calling the original method. I think that the problem is there. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey, Mockito matchers, scala value class and NullPointerException, NullPointerException: Testing DAO class that uses Ebean with Mockito and JUnit, Kotlin, Getting a null pointer exception when using when().thenreturn() in mockito, Mockito NoSuchElementException when() findById() get() thenReturn(), Mockito + JUnit test returns a NullPointerException, In the unit test of TestNG, nullPointerException is always reported when using the mokito stub function, I did not find a solution, Mockito returning null: Multiple external dependencies that needed to be mocked, The find() method of the EntityManager class returns NULL during the Mockito test UnitTest. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. log.info(bad product id..); For me it looks like that after the test with mocked Final class isn't correctly released and next tests instead of call of original java.lang.reflect.Method type calls it on mock. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey, Mock and InjectMocks return NullPointerException, Spring @Autowired field is null when running Mockito test. I used import static reactor.core.publisher.Mono.when by accident. @andrei-ivanov 's workaround works, but is quite slow. So the class under test was unable to find its required dependencies, creating the NPE. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Joshua bloch in effective java says that "Arguably, all erroneous method invocations boil down to an illegal argument or illegal state, but other exceptions are standardly used for certain kinds of illegal arguments and states. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey. I could confirm that have this issue too. Check which version of Junit you are using. 5. Sorted by: 1. Still, I you want to keep the compatibility you should include the junit-vintage-engine artifact in your test runtime path. Most of the people just forget to specify the test runner, running class for mocking. Your email address will not be published. My issue was that I was trying to mock an object which was final in my service. Read more >. All the above commented codes are not required IMHO you need to add a @RunWith(some.mockito.TestSuiteIDontRememberName.class) annotated to the test class. UPDATED: adding sample using spring junit runner and using spring boot's mockbean annotation. Does a password policy with a restriction of repeated characters increase security? Then shouldn't this answer be marked as correct? return new GatewayResponse(HttpStatus.Ok,product, Message.SUCCESS.getDesc()); After making function open tests started to pass. Unlike the mock() method, we need to enable Mockito annotations to use this annotation.. We can do this either by using the MockitoJUnitRunner to run the test, or by calling the MockitoAnnotations.initMocks() method explicitly. Sign in StockController stockController; I followed what @hoaz suggested. The url value you are using to stub the HttpUrlConnection creation from HttpAdapter i.e call to httpAdapter.createHttpURLConnection doesnt match the value you are passing to pingerService.ping. What's the most energy-efficient way to run a boiler? in an @BeforeEach setup. If I run the test class in a suite of tests (e.g. Why is printing "B" dramatically slower than printing "#"? Please review the below code: updateUser() method verification throws Null Pointer Exception. Just needed to remove final and it worked. This can be done in qn @Before method, in your own runner or in an own rule. My issue was the last one you commented on. I creat. I just want to make sure, that if any class calls this method, then no matter what, just return true or the list above. Leaving this comment for the next poor soul." None of these answers worked for me. How to verify that a specific method was not called using Mockito? In short in semi-pseudocode it should look like the following; @willa I finally figured out a way by mocking the class plus mocking the some methods and then calling the real method. Mockito : how to verify method was called on an object created within a method? toString() results in a null pointer exception, and using the mock also results in a null pointer exception. rev2023.5.1.43405. Is null check needed before calling instanceof? When calculating CR, what is the damage per turn for a monster with multiple attacks? When calculating CR, what is the damage per turn for a monster with multiple attacks? mvn install on a whole product), then the mock is created, but is defective, e.g. I tend to not mock the class under test (i.e. } ". Required fields are marked *. For example, the "org.easymock" package also does have an annotation called @Mock, which of course, won't work with Mockito specific setup. Which language's style guidelines should be used when writing code that is supposed to be called from another language? And here is not fully clear. He also rips off an arm to use as a sword. Especially when for String you got error but for java.lang.reflect. What I use is JUnit and Mockito. How should I deal with this protrusion in future drywall ceiling? The @Mock annotation requires a test suite that searches for the annotation and gathers the information to inject the values there. This seems so basic that I must be doing something . with stubbing behaviour of the MyService mock instance: When you do this, the MyRepository test suite mock instance can be removed, as it is not required anymore. Connect and share knowledge within a single location that is structured and easy to search. 3. I haven't used mockito on Groovy-based projects, but I have done Groovy based projects in the past with copious use of test doubles. When using @ExtendWith(MockitoExtension.class) make sure you're using JUnit 5: import org.junit.jupiter.api.Test; When using @RunWith(MockitoJUnitRunner.class) make sure you're using JUnit 4: import org.junit.Test; so this can be helpful to somebody who see such error. Mockito: Trying to spy on method is calling the original method. @David I think your problem should be a new question with a complete example. The object is null though, so the unboxing fails accessing a null pointer. Updated the example, even with this set, it is still returning null. It's a simple matter of checking each object returned to see which one is null. (Ep. Not the answer you're looking for? Null Pointer exception passed by test method, Mockito junit testing not working- beans mocked by @mockBean are null, Mockito Null Pointer Exception and Unfinished stubbing detected, Spring Boot JUnit test beanFactory.getBean null pointer exception, Folder's list view has different sized fonts in different folders, the Allied commanders were appalled to learn that 300 glider troops had drowned at sea. Has anyone faced the same issue? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Find centralized, trusted content and collaborate around the technologies you use most. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. I came across this issue while writing unit tests for Android. And what I knew was the code enters to throwable after getting Null Pointer Exception on getUnsuccessfulCallData(false, syncMessage) and the test fails Saying something like view.hideProgressDialog() wanted 1 time but was 2 times. This object is unboxed to an integer, so the generic type is determined to be 'Integer'. } What would help is to perform a bisect of Mockito versions to figure out which specific PR is causing issues. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. } Maybe would be nice solve it in same way as is e.g. So I had: I have no idea why that produced a NullPointerException. Figured out what was wrong, I needed to auto wire the service. P.S You need to think which class you actually want to test, that determines which instances should be mocked. What can we do to help you to solve this issue ? By calling Mockito.spy (YourClass.class) it will create a mock which by default uses the real . Ubuntu won't accept my choice of password. How do you test that a Python function throws an exception? Turns out I hadn't included the maven-surefire-plugin in my pom.xml and that meant the @ExtendWith wasn't actually doing anything! I am facing the same issue, but this time I am implementing an interface method that uses another class's method which for some reason returns null. If not share your stack trace as well as the code you are running. @Mock I know I should not be testing void methods like this, but I am just testing Mockito.doNothing() as of now with a simple example. I wasn't author of our test. Maybe this will help the next poor soul. I am using JUnit version 4 and i still needed "@RunWith(MockitoJUnitRunner.class)" annotation for "when" method to work properly. The test keeps failing with a null pointer exception. @Test Connect and share knowledge within a single location that is structured and easy to search. Annotate the test class with: @ExtendWith(MockitoExtension.class). To learn more, see our tips on writing great answers. But why do I get Null Pointer Exception here ? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Check that the method signature is not declared as final. ', referring to the nuclear power plant in Ignalina, mean? java.lang.NullPointerException: Cannot invoke "org.springframework.http.ResponseEntity.getStatusCodeValue()" because the return value of "com.learnit.testing.MyController.getUser(java.lang.Long)" is null. This also applies to method calls within when (.). FYI: I am using following versions of Gradle dependencies: Your repository instance is mocked and thus will return null for all unstubbed method calls. Example Error: Thanks !!! Core Concepts. That's means I also used the feature to mock final object mock-maker-inline. Removing the annotation, which wasn't needed in my case, did the trick. In my case, Intellij created Test with org.junit.jupiter.api.Test (Junit5) instead of import org.junit.Test of (Junit4) which caused all beans to be null apparently. There are not so much diff : v3.4.6v3.5.0, but for me simple (humble, grateful ;-)) user, it is Klingon ! We don't need mock this class now. public void findProductTest() For JUnit 5 the test class has to be annotated with: you need to initialize MockitoAnnotations.initMocks(this) method has to called to initialize annotated fields. You are instantiating a new service Service service = new Service(); but from what I can see you are never injecting the mock bean into the new service. Can you show all the declaration of the class. The test method name says the method should not sync if pull is disabled which I suppose it means an exception will be thrown. Here is a list of 3 things you should check out. to your account. The above will produce the same exact issue as OP. Which language's style guidelines should be used when writing code that is supposed to be called from another language. I had the same problem and my issue was simply that I had not annotated the class properly using @RunWith. I read the #1833 and sounds as good improvement. "This worked for me. P.S You need to think which class you actually want to test, that determines which instances should be mocked. When it run with other test all following test failed on this NPE. Not the answer you're looking for? In my case I was trying to mock a property which was annotated with @JvmField. You need to annotate the mocking object with the @Mock annotation. Window window; Pingback: Null pointer exception when stubbing Ask Android Questions, Followed ur steps well bt still facing the null pointer exceptions . getUnsuccessfulCallData(false, syncMessage) throws Null Pointer Exception which is inside subscribe of fun syncLocalOrders(syncOrders: SyncOrders). one or more moons orbitting around a double planet system. "Signpost" puzzle from Tatham's collection. doCallRealMethod().when(parentFeedReader).pullAndProcessAllFeeds(); Is there any known 80-bit collision attack? First you don't need both @RunWith (MockitoJUnitRunner.class) and MockitoAnnotations.initMocks (this); at the same time. How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version, Use Mockito to mock some methods but not others, Mockito test a void method throws an exception, Difference between @Mock and @InjectMocks. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. So, first we should mock a parameter, for instance. The text was updated successfully, but these errors were encountered: You should use doReturn/when construct instead of whenever/thenReturn. You run you test using SpringJUnit4ClassRunner and as far as I know, @Mock doesn't work unless you use MockitoJunitRunner or MockitoAnnotations.initMocks(this);. Exception as an Object. toString() results in a null pointer exception, and using the mock also results in a null pointer exception. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Why are you mocking something that you're autowiring? Corner case: When you run mvn test maven will report the location of this directory. 566), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. Null pointer exception when stubbing Ask Android Questions, 7 different ways how to get NumberFormatException in Java, How to figure out if a character in a string is a number, How To Turn Number To String With Padded Space or Zeroes, How to remotely debug Java application | Codepills.com, How to build with Maven without running tests, 3 basic mistakes for NullPointerException when Mock, How to trigger action with Scheduler and Quartz in Camel | Codepills.com, How to download a file from Azure Claud Storage. Make sure the rule is also on a public class or you will receive the message: Found this solution in comments that worked for me. Thanks for contributing an answer to Stack Overflow!
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