Also we should mock prefs. 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. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Problem with wiki is that you read it probably when you start with Mockito as newer. I have a class: open class Foo(private val bar: Bar) { fun print(): String { return bar.print() } } When I mock this class in java, I get a null pointer exception. Is "I didn't think it was serious" usually a good defence against "duty to rescue"? And the stack trace tells you precisely where it is occurring: PingerServiceTests.java:44. The solution was to change the annotation from @BeforeAll to @BeforeEach. 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. My issue was the last one you commented on. My issue was that I was trying to mock an object which was final in my service. By clicking Sign up for GitHub, you agree to our terms of service and The issue was that the activity that I was testing extended AppCompatActivity instead of Activity. I replaced @Mock with @InjectMocks - then issue was resolved. For example: Or alternatively, you can specify a different default answer when creating a mock, to make methods return a new mock instead of null: RETURNS_DEEP_STUBS. Where does the version of Hamapil that is different from the Gemara come from? Anyway, you have eliminated enough things in your code to make it untestable, and in this process you have not included how do you call the method to be tested at all. 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. In my case, it was the wrong import for when(). For me, it was because I was stubbing the mock in the @BeforeAll method. It allows you to mock a specific bean in the dependency graph. Can corresponding author withdraw a paper after it has accepted without permission/acceptance of first author. Needed to change the variable-names, since it's from my company ;). Figured out what was wrong, I needed to auto wire the service. For Mockito, there is no direct support to mock private and static methods. I don't know what's wrong, but it says that, One of them is enough for use @mock annotation, Thank you for answering! @Service public class Service { @Autowired private Consumer<String, String> kafkaConsumer; public void clearSubscribtions () { kafkaConsumer.unsubscribe We don't need mock this class now. Mockito 2 can handle mocking final method. (Ep. @David I think your problem should be a new question with a complete example. What is the current status? Original implementation is changed in the meantime and we don't mock java.lang.reflect. When to use LinkedList over ArrayList in Java? private StockService stockService; public GatewayResponse findProduct(String productId) { Leaving this comment for the next poor soul. one or more moons orbitting around a double planet system, Two MacBook Pro with same model number (A1286) but different year. This one catches out a lot of people who work on codebases which are subjected to Checkstyle and have internalised the need to mark members as final. @InjectMocks I had to change it to org.junit.Test and it worked. "Signpost" puzzle from Tatham's collection. It's a simple matter of checking each object returned to see which one is null. view.hideProgressDialog(); Where can I find the specification/docs for the first sentence of the answer? This doesnt answer the OP's original query, but its here to try help others with Mockito null pointer exceptions (NPE). one or more moons orbitting around a double planet system. What do hollow blue circles with a dot mean on the World Map? Is there any explaination for this issue ? I once accidently created a test with @Test from testNG so the @Before didn't work with it (in testNG the annotation is @BeforeTest). By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. But why do I get Null Pointer Exception here ? Product product = optional.get(); To fix this, I was able to just replace AppCompatActivity with Activity since I didn't really need it. Ubuntu won't accept my choice of password. He also rips off an arm to use as a sword. 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. Where does the version of Hamapil that is different from the Gemara come from? - ManoDestra. Check which version of Junit you are using. You signed in with another tab or window. 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. Mockito : how to verify method was called on an object created within a method? Find centralized, trusted content and collaborate around the technologies you use most. The source code of the examples above are available on GitHub mincong-h/java-examples . devnews.today != http://devnews.today. 3. Why is printing "B" dramatically slower than printing "#"? It's a simple matter of checking each object returned to see which one is null. Also note that there's nothing in your code that makes your service use your mocks. If we had a video livestream of a clock being sent to Mars, what would we see? Asking for help, clarification, or responding to other answers. In the following example, we'll create a mocked ArrayList manually without using the @Mock annotation: @Test public void whenNotUseMockAnnotation_thenCorrect() { List . (Ep. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Debug and check if you are returning something. That's a good remark, Ridcully. 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. You seem to mix Spring, and Mockito. Mockito.when(httpAdapter.createHttpURLConnection("devnews.today")).thenReturn(mockHttpURLConnection); Website website = pingerService.ping("http://devnews.today"); Hence at runtime HttpUrlConnection is actually null wthe default return value for mocks, Instead of @Autowire on PingerService use @InjectMocks, Then, (since you are using SpringJUnit4ClassRunner.class) add a method annotated with @Before. @dkayiwa. So instead of when-thenReturn , you might type just when-then. Does a password policy with a restriction of repeated characters increase security? } The test method name says the method should not sync if pull is disabled which I suppose it means an exception will be thrown. In this tutorial, we'll see common errors that lead to a NullPointerException on an Autowired field. Mockito: Trying to spy on method is calling the original method. To solve this, you can use the @InjectMocks annotation instead of = new CustomerProfileService (customerProfileRepository); Alternatively, you can manually create the spied service in the before/beforeEach . IMHO using the MockitoRule is the best one, because it lets you still choose another runner like e.g. What is this brick with a round back and a stud on the side used for? So given case class ValueClass(value: Int) extends AnyVal, what you want to do is ValueClass(anyInt) instead of any[ValueClass]. You have to inject the class annotated with @Mock IMHO using the MockitoRule is the best one, because it lets you still choose another runner like e.g. How do you assert that a certain exception is thrown in JUnit tests? Then as if by magic, it started working for me. Removing the mocking of the java.lang.reflect.Method made everything green again. using mocks in tests. You can use our Bintray repository which hosts all of our versions to hopefully determine the exact version at which things start to break: https://bintray.com/mockito/maven/mockito. 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. Thanks, initMocks is deprecated, use MockitoAnnotations.openMocks instead. What solved this issue for me (combination of answers above and my own additions): When doing command + N --> Test in Intellij it generates (as a default at least) some boilerplate that did not work in my case. Especially when for String you got error but for java.lang.reflect. Break even point for HDHP plan vs being uninsured? +1 for the "make sure your are using JUnit for all annotations"! 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. How do the interferometers on the drag-free satellite LISA receive power without altering their geodesic trajectory? The stack trace which is in surefire reports would show exactly what other mocks you need. Well in my case it was because of wrong annotation usage. In your example, make sure that you have: Once I did that, the NullPointerExceptions disappeared. It is stored in surefire reports directory. By calling Mockito.spy (YourClass.class) it will create a mock which by default uses the real . What's the cheapest way to buy out a sibling's share of our parents house if I have no cash and want to pay less than the appraised value? The CustomerProfileService will be initialized before the mocks are created, therefore, the repository will be null. Use one or the other, in this case since you are using annotations, the former would suffice. Mockito.doNothing () keeps returning null pointer exception. Conclusion. Mockito: Trying to spy on method is calling the original method. As we solved it by rewrite unfinished feature. How to verify that a specific method was not called using Mockito? What I use is JUnit and Mockito. }, @RunWith(MockitoJunitRunner.class) This does not work trivially, and so the second layer mock was null. But I mocked the consumer, why is it throwing null pointer exception and I should be skipping over that method, right? When an object is mocked, unless stubbed all the methods return null by default. Same problem can occur if you are using Junit5 since there is no more '@RunWith' annotation. So I had: I have no idea why that produced a NullPointerException. I wasn't author of our test. pr.setName(buhbdf); Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. I read the #1833 and sounds as good improvement. There's a limitation in Mockito-kotlin verifying non-null parameters - it's mentioned in the wiki. This mean you should explicitly use doCallRealMethod (yourMock).when (yourMethod ()) if you want the mock's method to behave like it normally would. But for sure, NullPointerException happened because you want something which is not there. Yes @InjectMocks is for exactly the same purpose to use all the Mock objects. Otherwise thanx for your input. Have a question about this project? That's why you get a NPE, because mockHttpURLConnection is null in your test method. But in few test classes both @RunWith(MockitoJUnitRunner.class) and MockitoAnnotations.initMocks(this) worked together only. Matchers wont work for primitives, so if the argument is a primitive you will will need the anyChar/Int/Boolean etc. To learn more, see our tips on writing great answers. Most of the people just forget to specify the test runner, running class for mocking. Today, I shared 3 different ways to initialize mock objects in JUnit 5, using Mockito Extension ( MockitoExtension ), Mockito Annotations ( MockitoAnnotation#initMocks ), and the traditional Mockito#mock . Yes I did, But getting same error Null Pointer Exception. Learn how your comment data is processed. Then shouldn't this answer be marked as correct? It can cover both Constructor injected & Field injected dependencies. Mockito test a void method throws an exception. 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. You are running a Mock test with @RunWith(MockitoJunitRunner.class). Exception as an Object. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Presentation of the Problem. For me the reason I was getting NPE is that I was using Mockito.any() when mocking primitives. From current documentation it isn't really clear if this is or isn't supported. every thing is fine just getting NullpointerException. 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. Trying to upgrade Mockito from 3.4.6 (3.4.8 wasn't published to Maven central) to anything 3.5.x (3.5.7 included) and I get some weird NPEs, which don't happen if I run each test on its own: Initially I thought it might be caused by the new MockedStatic usage, but I've marked those classes with @Disable and the exceptions happen anyway and the test classes that are affected weren't using MockedStatic anyway, so I'm not exactly sure how to investigate this further. This is where google took me when I had the same NullPointerException with Junit 5, but was correctly using @ExtendWith(MockitoExtension.class) in my maven project. Something like My tests work with Mockito 3.3.3, but fail with 3.6.0. There are not so much diff : v3.4.6v3.5.0, but for me simple (humble, grateful ;-)) user, it is Klingon ! Please, read the page How to create a Minimal, Reproducible Example and edit your question to include testable code, showing that NPE, so we can, at least, see how and where it is occuring. 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. This might not be a viable solution for everyone, but hopefully knowing the root cause will help someone. public void pullAndProcessAllFeeds_shouldNotSyncIfPullIsDisabled() { Sorted by: 1. In my case it was due to wrong import of the @Test annotation, Make sure you are using the following import. Can Mockito capture arguments of a method called multiple times? I also notice that DAO was null so I did this(Just to mention, I did the below step to try, I know the difference between springUnit and Mockito or xyz): How do I mock external method call with Mockito. What does 'They're at four. To learn more, see our tips on writing great answers. Specify Mockito running class. Parameterized. { if you use @Mock Annotation to Context mockContext; But it will work if you use @RunWith(MockitoJUnitRunner.class) only. Maybe this will help the next poor soul. My NPE was happening as I did not explicitly set the class under tests' dependencies to be the classes I had mocked. return new GatewayResponse(HttpStatus.NO_CONTENT,product, Message.SUCCESS.getDesc()); Junit test case for spring MVC with RestEasy, Spring MVC testframework fails with HTTP Response 406, Mocking a file, filewriter and csvwriter within a method for unit test throwing NullPointerException, Spring MVC application Junit test case failing, Maven dependancy with spring boot and Junit, Generating points along line with specifying the origin of point generation in QGIS. Any chance to get an error or a warning for these classes if we try to mock them? What's the most energy-efficient way to run a boiler? Do this for all the mocks you are creating. And it is the 3.5.0 version that made the break for me. And there's a problem in your test code you are telling the mocked instance to return null when calling method findById(), so most probably if that was to happen, you'll get a NPE in the main code, when trying to use the .orelse() method. @pyus13 This should be a new question with more code. P.S You need to think which class you actually want to test, that determines which instances should be mocked. I tried different version. Thank you very much! So for everyone else landing on this page in the future, try your best to find in your code mocking of java.lang.reflect.Method and address those tests. Making statements based on opinion; back them up with references or personal experience. I've managed to make a reproducer When I run the below code, I get, What's the cheapest way to buy out a sibling's share of our parents house if I have no cash and want to pay less than the appraised value? Connect and share knowledge within a single location that is structured and easy to search. Make sure that method() is not declared as final: Mockito cannot mock a final method and this will come up as a wrapped NPE: Buried deep in the error message is the following: None of the above answers helped me. If I run the test class in a suite of tests (e.g. Yes I have worked on a prototype to make that happen: #1833 Sadly I haven't had the time to get back to that. Getting a null pointer exception when invoking a method on a mock. Check your imports, based on the usage of. For future readers, another cause for NPE when using mocks is forgetting to initialize the mocks like so: Also make sure you are using JUnit for all annotations. Cache cache = mock (Cache.class); when (cache.get (anyObject ())).thenReturn (null); I get a null pointer exception when cache.get tries to access the. Change getUnsuccessfulCallData(showDialog: Boolean, syncMessage: String) to open instead of internal or enable mock-maker-inline (if you haven't already). IMHO you need to add a @RunWith (some.mockito.TestSuiteIDontRememberName.class) annotated to the test class. I get an NPE when I run the exact code on my IDE. You will have to adapt to your environment/configuration. I followed what @hoaz suggested. I see that when the someDao.findMe (someObject.getId.toString ()) execute it does NOT trigger my MockDao return statement, but instead tries to evaluate someObject.getId.toString (). When calculating CR, what is the damage per turn for a monster with multiple attacks? The test example did not so I had to sort of fake it. Could a subterranean river or aquifer generate enough continuous momentum to power a waterwheel for the purpose of producing electricity? And here is not fully clear. But was 2 times. Have a question about this project? 1 Answer. To learn more, see our tips on writing great answers. You signed in with another tab or window. Well occasionally send you account related emails. There are two solutions: Use deep stubbing: ValueProducerFactory valueProducerFactory = Mockito.mock(ValueProducerFactory.class, Mockito.RETURNS_DEEP . That's means I also used the feature to mock final object mock-maker-inline. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Is there such a thing as "right to be heard" by the authorities? Stubbing Method will therefore lead to undefined behavior. 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. This annotation is a shorthand for the Mockito.mock() method. I'll add that note. Please review the below code: updateUser() method verification throws Null Pointer Exception. in testing class it mocked object is mocking perfectly but when it goes to corresponding class that mocked reference is becoming null. The main issue here is whenever I try to run the test syncLocalOrders_OrderNotEmptySuccessTest(), the code enters to both subscribe and throwable of fun syncLocalOrders(syncOrders: SyncOrders) (this was got by keeping breakpoints.) Maybe try setting a breakpoint and run the test in debugmode. Unfortunately, Method is one of the classes that Mockito relies on internally for its behavior. //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. Dont forget to annotate your Testing class with @RunWith(MockitoJUnitRunner.class). Somehow, Intellij assumed I want to use, I somehow missed this line "MockitoAnnotations.initMocks(this); ". is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. "This worked for me. (Ep. Your email address will not be published. This only happens in Android Espresso tests. StockController stockController; In my case, my Mockito annotation didn't match the JUnit Version. Does a password policy with a restriction of repeated characters increase security?
Categories
