Mockito thenreturn not null. Mockito can have trouble mocking methods that are hidden (e.

Mockito thenreturn not null verifyNoMoreInteractions(). buildInfo(A. times(1)). I don't want to actually call the b, so I've mocked the answer above like this: Your repository is a mock object and does not contain any actual code. Getting a null pointer exception when using when(). not，确定为什么resultUser总是重设null，我的考试 Oct 2, 2018 · I'm fairly new to Mockito and testing, but I can't figure out what is wrong with this exactly, this is a simple MVP structure lateinit var activity: MainActivity private val aET = mock<EditTe So guys, I found what the problem was, after much debugging, it seems that using Mockito. Jan 5, 2022 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. For some reason if i create getter function manually it works: fun getVoucherNumberTest() : String { return voucherNumber } Feb 5, 2022 · I have a method on a controller to get a list of all the punishment types for a chat room (Kick, Ban, Warn and Mute). Edit: I made it to work, read answers. If you stepped onto that line that gets the NPE, you’ll see that “context” is null. class) only. Jun 5, 2022 · java. junit. Reload to refresh your session. public interface BookService { String getAuthor(); void queryBookTitle(BookServiceCallback callback); } You can stub getAuthor() using doAnswer and thenReturn. Aug 22, 2015 · Sorry for such a basic question. 4。 用户resultUser=userService. As per Mockito you can create mock object by either using @Mock or Mockito. Mockito mocks then default back on doing nothing by method call and if there is a return value return null. getItems() in my Source. empty() in those cases. thenReturn() is not returning anything and I'm getting a null pointer exception at the "if" validation. MockitoRule; public class MockitoNotNullTest { private static class Dependency1 { } private static class Oct 14, 2015 · I have a class A with 2 functions: function a() which returns a random number. Dec 30, 2021 · I'm trying to implement Mockito to test a particular method but the . Mostly because any() and any*(*) achieve this inconsistency in nulls. But getting NullPointerException when running a test. – Oct 31, 2014 · 私は特定のメソッドをテストするためにMockitoを実装しようとしていますが、. 8). Mockito's `thenReturn` method is a powerful feature for stubbing method calls in unit tests. You're most likely not able to mock the method when replacing any() with anyString() simply because one of the method arguments is actually null rather than a String . 0. eq(your list). when returns null. You mocked a class customerDataRepository but did not instruct it the mock what to do if the corresponding method is called. When an object has multiple constructors, this code in withAnyArguments generates matchers for the first constructor and matchers for the remaining constructors are generated somewhere else (during the thenReturn flow somewhere I haven't found yet). when. 0 Kotlin version 1. Load 7 more related questions Show fewer related questions Sorted by: Reset to Jun 1, 2014 · First, check that the method is non-final and visible throughout its hierarchy. Not sure how could I make it to work. The Rest controller depends on this ContactService. verifyZeroInteractions(), and Mockito. verify(), Mockito. The Aug 31, 2021 · I am writing the unit test to Class_b and getting Null pointers exception due to when(). android { // testOptions { unitTests. The below code demonstrates it. 0 and Junit-5 and spring-boot 2. Since your returned customerData is null you get your NPE when calling on this object. @Component Class_b{ @Auto Dec 14, 2022 · I guess that your User class has an equals/hashCode defined either on the userID field or on all fields. Let's mock this BookService. x (version 2. 19 mock returns null instead of result Apr 18, (userService. Sep 29, 2015 · Suppose I am having this object objectDemo which calls to the method objectDemoMethod with 2 parameters String and null. Mar 15, 2021 · 1) Please stick to Java's naming conventions as lower-case letters are usually used for fields/members/variables but not for classes 2) there is difference between mock and spy and how you need to setup the mock. overriding a package-private abstract class's implementation); also, Mockito is entirely unable to mock final methods, or even to detect that the method is final and warn you about it. Nov 6, 2012 · Mockito not returning correct result from mocked method with multiple "when" conditions. java cla May 7, 2014 · Ask questions, find answers and collaborate at work with Stack Overflow for Teams. May 4, 2018 · I'm new at Mockito and I have problem with thenReturn method. Mockito. Solution: Ensure the method is not marked as final, or alternatively, use PowerMock for mocking final classes. Apr 18, 2018 · plamenkolev2 changed the title Mockito 1. thenReturn() method and the scenarios in which it is used. Jun 9, 2021 · 文章浏览阅读1. 0. public class AClass { public void Dec 29, 2016 · The issue ended up having to do with the fact that Mockito. 4. 7w次，点赞21次，收藏43次。本文介绍了如何使用Mockito针对对象参数进行智能匹配，避免因参数不一致导致的null或空集合结果。讲解了Mockito. Here the main class method createNewId() is getting the object by hitting dao class 'memberDao. Feb 25, 2022 · When mocking the static method, the static method that does not specify the return value returns a null value, why not return the value of the original logic? #2575 Closed dengqi1999 opened this issue Feb 25, 2022 · 1 comment Jan 4, 2010 · Saved searches Use saved searches to filter your results more quickly Aug 16, 2015 · The problem here is the fact that android. 10. thenReturn ()` is a crucial feature for stubbing methods in unit tests. then in that case one can use Powermock with mockito. thenreturn() in mockito. I've read tutorial where this kind of solution work well, but in my programme there must be any inconsistency compare to aforementioned Aug 15, 2012 · Next, anyList() produce mockito matcher and you should pass matcher to userDao. Exception appear because by default Mockito creats nice mock and by default they returning null on any unexpected method invocation. thenReturn(value) does not return value, instead it returns null. 1. When I debug and check if the defined rule is VALID and APPLIED within the System Under Test (that is my Controller) then, the rule is not applied at all and it returns a null value instead the one I wanted. Chances are: The mock is not injected. I am trying to mock 'memberDao. g. Am I checking whether or not _someMockedObject is equal to a Client? I'm just a little bit unclear here. thenReturn("some number") But serverVoucher. Here is how my class and test looks like. exchange method through mockito but it always returns a null value no matter what i return through mock , even if i throw an Dec 12, 2014 · Saved searches Use saved searches to filter your results more quickly For what it's worth I reproduced this problem with the latest HEAD of branch release/2. verify(objectDemo, Mockito. getRefinement(GraphView. I have DTO class for my entity class which I give as input for the controller method. As this is a nullable reference, the suggested API to match null wrapper would be isNull(). In eclipse unit test view I'm getting this Failure Trace: org. Try Teams for free Explore Teams Dec 29, 2021 · You are following some old Mockito example that predates Dart null-safety. Mockito can have trouble mocking methods that are hidden (e. Mockito doesn't mock final methods so the bottom line is: when you spy on real objects + you try to stub a final method = trouble. save (user1 Sep 9, 2017 · The type of the first and second argments is not clear from your code extract since we do not see where path and id are declared but unless they are both of type String then the given argument matchers for these parameters (Mockito. an empty string). Mar 6, 2017 · JUnit Mockito When thenReturn example explains the usage of the special method of Mockito framework. objectDemoMethod(Matchers. How to return the argument passed to a Mockito-mocked Aug 20, 2020 · EDIT it's most likely due to the functions being suspend functions My test is crashing beacause Mockito returns null where it user,pass)). Mockito thenReturn() returns null value. This does not work trivially, and so the second layer mock was null. thenReturn(baz) will actually call foo. In a test I wrote this: A test = Mockito. Mockito when(). When you mock your repository in your setUp method, you define what the method should do when it is called with the exact object that you specified, comparing the given object to the object specified in the mock by calling the equals/hashCode method. methodUnderTest(); Mockito. voucherNumber gives me null always. For this, SharedPreference was stubed using When() thenReturn(). concat("Baeldung", null); } We called Mockito. I know that _someMockedObject is mocked by Mockito. Try one of the following: Add @RunWith(MockitoJUnitRunner. thenReturn() in not working. With null-safety, you should not be defining the MockRandomWordsRepository class (or other mock classes) yourself. Download the Eclipse project. I have a scenerio here, my when(abc. thenReturn () seems to always be returning a null object instead of what I intended: CUT: // injected via Spring. I was using a method that required a mock object of varargs to be passed. thenReturn()` is a crucial feature for stubbing methods in unit tests. thenReturn the MockBean KafkaPublisher tries to actually publish the events to Kafka. Apr 9, 2019 · I'm trying to mock a restTemplate. Mistake: Using a final method with Mockito's when (). findNext()' and return the object as shown in below code but it is returning as NULL. This means that you will run into ugly warnings when you try to use it on mocked methods where the parameters are annotated with @Nonnull. anyVararg(). Key Features of the Extension Non-null Defaults: The extension automatically provides non-null default values or proxies for methods that would otherwise return null. mockito, when setup mock stub using when Nov 6, 2017 · Because of type erasure, though, Mockito lacks type information to return any value but null for any() NullPointerException or other exceptions: Calls to when(foo. May 17, 2024 · We can use the thenReturn () stubbing technique in Mockito to stub methods that return a value. Dec 9, 2019 · Mockito thenReturn always null , Spring-Boot + Junit5 + Mockito. anyString()) will not match and hence the mocked call will return null. Sep 16, 2020 · An exception (NullPointerException) happens in the line of . class) above your test class Mar 13, 2017 · I am using mockito as mocking framework. However, as I have been reading on the spe Apr 14, 2016 · doAnswer and thenReturn do the same thing if: You are using Mock, not Spy; The method you're stubbing is returning a value, not a void method. Problem: I am using @MockitoBean annotation for mocking the ContactService. Mockito; import org. 86. Mocking methods having parameters. As a re I am using Mockito and have tried to mock the below test class. NullPointerException May 4, 2018 · 我是Mockito的新手，那么thenReturn方法有问题。 我已经阅读了使用这种解决方案的教程，但是与上述示例相比，在我的程序中必须存在任何不一致之处。 Apr 30, 2020 · I am trying to write unit tests for a rest controller class in my application using MockMvc and Mockito. Jul 18, 2022 · thenReturn(T) で、 when() メソッドの引数で実行したメソッドが返す値を指定する; when(T) が受け取る型と thenReturn(T) が受け取る型は一致するようになっているので、間違った型を指定した場合はコンパイルエラーになる（型安全） モックのデフォルトの振る舞い Dec 7, 2017 · It is a bit hard to tell since your code example is not complete, not a direct copy, and you also did not paste the NPE or the line in which it happens. thenReturn() seems to always be returning a null object instead of what I intended:. Steps to follow when mocking static method using powermock. 4. save(userDto)；上面的行返回始终为空指针exception. The solution (after much debugging) is to cast the any() matcher in the test function to the corresponding class type: Dec 8, 2020 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand Mockito's `when(). kt:178) getRefinement method can only accept the Graph object. thenReturn(Pair(null Nov 22, 2023 · When working with Mockito, a popular Java mocking framework, developers often encounter a scenario where Mockito defaults to using null for unstubbed calls. Try Teams for free Explore Teams Sep 2, 2015 · I am having a problem on my query object, it becomes null even though I stub it with a query mock object. verify(helper) . public class DQExecWorkflowServiceImplTest { @ Mar 2, 2020 · JUnit & Mockito - thenReturn is returning null when using on WebServiceTemplate. You can rectify this by using Mockito. 60. By default, for all methods that return a value, a mock will return either null, a primitive/primitive wrapper value, or an empty collection. This guide explores common causes and effective solutions to this issue. private InterfaceBP bpService; public void setBpService(InterfaceBP bpService) { this. I am using mockito 2. The mock returns null Feb 16, 2021 · Mockito. Jun 24, 2015 · I am new to Mockito library and stuck somewhere. You switched accounts on another tab or window. Sep 27, 2014 · The return type of AdditionalMatchers::not is 0 for all numeric primitives, false for the boolean primitive and null for all non primitive objects T. Test; import org. return null, without any logic?. findNext()'. import static org. Modified 4 years, 1 month ago. May 19, 2013 · However, you're not telling Mockito what result the mock should give when invoked with arguments, so Mockito uses its default behaviour of returning null. Dec 8, 2022 · Calling when now sets up stubbing for the second mock instance, but your service does not know about this instance, because it only holds a reference to the first mock instance. If the token is null , the argument is not matched, causing Mockito to return the default value ( null ). Test Class public class PersonServiceImplTest { Car ca Jan 5, 2016 · It helps to run your unit tests in the debugger. accept(MediaType. You signed out in another tab or window. run(), it is returning NullPointerException (not the items I set in the mock) because it is stepping through my getItems() method which tries to access a field that is null (it's null since Fetcher is a mocked class). net. mock(LoyaltyVoucher::class. thenReturn() returns always null. lang. verify() to check that the argument values were the expected ones. APPLICATION_JSON) because the uri() returns null and the code tries to call method . createNativeQuery(queryString, SomeRandom. any(). Jun 28, 2018 · Currently when using Mockito the default behavior is to return null for regular objects including Optional return types. same(your list) or Matchers. Watch out for final methods. class Apr 10, 2014 · Mockito - thenReturn always returns null object. 5. RELEASE Oct 14, 2015 · All the above commented codes are not required { mockContext = Mockito. The fact that BImpl is a real class with real behaviour is irrelevant. It is important I am currently in the process of using Mockito to mock my service layer objects in a Spring MVC application in which I want to test my Controller methods. Dec 16, 2024 · Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. anyString() does not match null values, because null is not an instance of String. getRefinement, parameter graph at GraphParser. Aug 7, 2018 · Ask questions, find answers and collaborate at work with Stack Overflow for Teams. Rule; import org. Mistake: Not matching the actual method call with the when () clause. objectDemoMethod("SAMPLE_STRING", null); I have written this: Mockito. accept() on a null object. any(), does not mock varargs appropriately. Problem is when I mock save method of Spring jpaRepository I always get null. method()). I'm trying to implement Mockito to test a particular method but the . In that case you could put @Inject on the constructor of the class and manually inject the mock in the test, just to make sure. Aug 26, 2020 · I am writing unit test cases using Mockito and JUnit . Jul 28, 2020 · 2. bar(any())). thenReturn doesn't give Nov 6, 2023 · This explains why Mockito only returns "OK" when the token is non-null (e. Jan 5, 2016 · If I see it correctly: "request. 0-beta. However, there are instances when this setup may not work as expected, leading to `null` being returned instead of the desired value. From docs,. Mockito: using a method in "thenReturn" to return a mock doesn't work. Spring Boot JUnit5 Mokito when thenReturn not working. 2. Jan 4, 2010 · Mockito version 3. This behavior, while initially perplexing, is an intentional design choice aimed at promoting safe and clear testing practices. AssertionFailedError: expected: not null. Mockito is calling real method and thenReturn does not work. bpService = bpService; Mockito's `when (). Jan 23, 2018 · Turns out that Mockito, after "accepting" the first argument as Integer, fails to aceppt the second argument as String. class. But the Mockito-(Parameter-)Test before with verify() and Assertions. Since getFilteredList() is not stubbed, you're getting a default return value that does not pass the assertions you have later. PowerMockRunner. 22. Let's go deeper in my code! Dec 27, 2022 · I'm trying to test an exception, for this I need one of the attributes of the Class that returns from the POST request. Modified 4 years, 11 months ago. Related. Sep 14, 2017 · If within the test I control the result of the when(). you would have to code something like: Nov 23, 2023 · An innovative Mockito extension has been developed to prevent methods from returning null values in tests. Found it through the debugger. java class. mock(A. jar file that is used to run unit tests does not contain any actual code. I'm not sure what I"m checking for in terms of the expected arguments. any(String. To demonstrate, we’ll test the get () and add () operations of a list using thenReturn () and doAnswer (): @Override public String get(final int index) { return null; @Override public void add(int index, String element) { // no-op . Mock; import org. Nov 17, 2017 · I recently started reading up about Mockito. Feb 25, 2025 · I am trying to test Spring Boot's Rest controller. thenReturn(). The following line of code must return true as per my understanding, but it returns false. 3. I'm just a little discouraged as to why i can't for the life of me configure a thenReturn on my mock. 1) use specific Runner i. 0, only allow non-null String. `when`(serverVoucher. The problem is, you’re creating a mocked context in your test, but you don’t store it anywhere that your CUT (code under test) can use it. I wrote the code to mock SharedPreference in the class to be tested. transform(any()). This can stem from several common issues in the testing process. Mar 2, 2017 · Mockito thenReturn() returns null value. 我试图实现Mockito来测试特定的方法，但是. – Mar 2, 2024 · The problem is that in each call of fetcher. If anyone could help me on this problem I would be very grateful. IllegalArgumentException: Parameter specified as non-null is null: method GraphParser. This way android. class);, Oct 25, 2016 · Since Mockito 2. Uri will return null by default and using. class) M Oct 5, 2015 · I am trying to unit test a method, which has different branches depending upon the value of an object that is created inside it. any() for every mock value is not a very good practice, since some of the attributes in the function arguments can be primitive, and so, do not go along well with the Object type returned from Mockito. I've successfully mocked the RestTemplate but my when(). This is an example of JUnit Mockito When thenReturn. fail; import org. However, situations can arise where it unexpectedly returns null instead of the intended value. Sep 23, 2021 · Mockito thenReturn() returns null value. thenReturn() is not returning a Dec 11, 2013 · I am using mockito as mocking framework. 7. Since Mockito 2. On the first test when I mock the data it works as expected and the test passes. bar(null), which you might have stubbed to throw an exception when receiving a null argument. thenReturn（）は私が意図したものではなく常にnullオブジェクトを返しているようです：CUT：public class TestClas Mar 15, 2019 · But it looks like your annotations are not being processed while running a test suit. This and related problems are discussed in the answer to Why is my class not calling my mocked methods in unit test?. I'm mocking a method with any() matcher and want to be more specific than that (maybe for cleaner code or maybe for new overloaded method) so I changing it to anyString(). thenReturn(mappedData) Crash occurs java. Viewed 400 times 0 I am trying to Jan 10, 2019 · This works if you specify the expected type of the parameter in the verify method call:. . Mockito when() method not working and getting null pointer exception. Dec 6, 2018 · If I make a JUnit Mockito test in the following method, it fails with org. returnDefaultValues = true } } will not solve the issue for this case, since default return value for method still null Apr 27, 2021 · If I take out the Mockito. Aug 20, 2013 · Although it is not good coding practice to mock static method, private method or constructor. MockitoJUnit; import org. I can change only my test class. Aug 6, 2021 · I am writing test code using Android Mockito framework. getServletContext()" is a call on a mock and the method is not mocked via a when-call, so it returns null. mock(Context. Oct 14, 2016 · I am not sure why PowerMockito. Mar 27, 2023 · Mockito provides several methods for verifying interactions with mock objects, such as Mockito. Ask Question Asked 4 years, 1 month ago. But if have some legacy code and you need to mock it. On debugging I get to know that Mockito on method: when(). java) Mockito. getByCriteria in order to do something, so, you should use Matchers. The corollary is that when an *unstubbed* method is called *on the spy* but *not on the real instance*, you won't see any effects on the real instance. The field does not contain an instance of that class; it contains an instance of a mock. e. This is my class under test: public class A { public Integer callMethod(){ return someMethod(); } private Integer someMethod(){ //Some Code Dec 18, 2023 · val serverVoucher = Mockito. I am using such code in my project but for testing I have made a dummy Jan 8, 2024 · Let’s keep it simple and check that the first argument of the call is Baeldung while the second one is null: @Test void whenMethodUnderTest_thenSecondParameterNull() { main. kt) at A. Ask Question Asked 4 years, 11 months ago. Provide details and share your research! But avoid …. mockito. This is the code Query query = getEntityManager(). Mar 23, 2015 · Such a painful decision. I thought if it was mocked, it would just have a minimal implementation - e. thenReturn()似乎总是返回一个null对象，而不是我想要的：我正在使用mockito 2. Aug 1, 2020 · Mockito thenReturn not working, returns Null. Apr 24, 2019 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. This example explains the usage of the when(). thenReturn() rule, there it works fine. Apr 12, 2015 · In my case (not the case for this question), I was trying to mock a dependency for another Mock for the UUT (i. Assert. Now I want to verify with Mockito that this method was called: objectDemo. voucherNumber). any()和自定义ArgumentMatcher在单元测试中的应用，帮助开发者解决复杂接口调用中的mock问题。 Dec 28, 2019 · You are passing null but expecting anyString(). 0和Junit-5以及spring 2. Aug 6, 2023 · You signed in with another tab or window. E. thank you, i have mocked update and config classes and passed as arguments to the update method on myService as below which was causing issue. Instead of returning null it would be better to return Optional. function b() which calls a() and return the value returned. I am not let to change the Service class. Mar 31, 2017 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Any help will be appreciable. Hot Network Questions May 7, 2022 · The solution is simple. two layers of mocks). Jan 10, 2019 · You signed in with another tab or window. Asking for help, clarification, or responding to other answers. class);}, if you use @Mock Annotation to Context mockContext; @Mock Context mockContext; But it will work if you use @RunWith(MockitoJUnitRunner. 1. thenReturn () without proper setup. opentest4j. 19 mock returns null Mockito 1. 10 When trying to execute when(mapper. jifia aynll xvpg tzlhmxh eyxkoi xoltkx igfnh aloklf bbngjf khns vvg xvfubfpb jpuxulyk aqgt wxvp