Unnecessary Stubbings Detected | Mockito 3 – Stubbing Method With When() And Thenreturn() 모든 답변

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unnecessary stubbings detected 주제에 대한 자세한 내용은 여기를 참조하세요.

Mockito Strict Stubbing and The UnnecessaryStubbingException

Simply put, an unnecessary stub is a stubbed method call that was never realized during test execution. Let’s take a look at a simple example: @ …

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Source: www.baeldung.com

Date Published: 12/27/2021

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How to resolve Unneccessary Stubbing exception

UnnecessaryStubbingException: Unnecessary stubbings detected in test : Test Clean & maintainable test code requires zero unnecessary …

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Source: stackoverflow.com

Date Published: 4/14/2021

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[FIXED] Unnecessary Stubbing in test class when writing unit …

The stack trace for the error is : org.mockito.exceptions.misusing.UnnecessaryStubbingException: Unnecessary stubbings detected in test : …

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Source: www.javafixing.com

Date Published: 4/3/2021

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Fixing Mockito UnnecessaryStubbingException with JUnit5

JUnit 5 is tricter regarding stubbing. As explained in the error message, unnecessary stubbing is not a good practice. It usually results from …

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Source: nicolas.riousset.com

Date Published: 4/26/2022

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Detect unnecessary stubbings · Issue #558 · mockk … – GitHub

Mockito throws an exception when a function is stubbed and then not actually invoked. This is particularly useful when doing TDD, …

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Source: github.com

Date Published: 10/6/2021

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How should I handle a UnnecessaryStubbingException that is …

UnnecessaryStubbingException: Unnecessary stubbings detected in test … Please remove unnecessary stubbings or use ‘lenient’ strictness.

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UnnecessaryStubbingException (Mockito 2.2.7 API)

Unnecessary stubs are stubbed method calls that were never realized during test … To find out more about detecting unused stubbings see MockitoHint .

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Source: site.mockito.org

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Misleading UnnecessaryStubbingException when Mockito is …

UnnecessaryStubbingException: Unnecessary stubbings detected in test : MockitoProblem Clean & maintainable test code requires zero unnecessary code.

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주제와 관련된 이미지 unnecessary stubbings detected

주제와 관련된 더 많은 사진을 참조하십시오 Mockito 3 – Stubbing method with when() and thenReturn(). 댓글에서 더 많은 관련 이미지를 보거나 필요한 경우 더 많은 관련 기사를 볼 수 있습니다.

Mockito 3 - Stubbing method with when() and thenReturn()
Mockito 3 – Stubbing method with when() and thenReturn()

주제에 대한 기사 평가 unnecessary stubbings detected

  • Author: Dinesh Varyani
  • Views: 조회수 8,263회
  • Likes: 좋아요 118개
  • Date Published: 2020. 11. 28.
  • Video Url link: https://www.youtube.com/watch?v=6RQ37DyCizo

How to resolve Unneccessary Stubbing exception

At first you should check your test logic. Usually there are 3 cases. First, you are mocking the wrong method (you made a typo or someone changed tested code so that mocked method is no longer used). Second, your test is failing before this method is called. Third, your logic falls in wrong if/switch branch somewhere in the code so that mocked method is not called.

If this is the first case you always want to change the mocked method for the one used in the code. With the second and the third it depends. Usually you should just delete this mock if it has no use. But sometimes there are certain cases in parametrized tests, which should take this different path or fail earlier. Then you can split this test into two or more separate ones but that’s not always good looking. 3 test methods with possibly 3 arguments providers can make your test look unreadable. In that case for JUnit 4 you silent this exception with either

@RunWith(MockitoJUnitRunner.Silent.class)

annotation or if you are using rule approach

@Rule public MockitoRule rule = MockitoJUnit.rule().strictness(Strictness.LENIENT);

or (the same behaviour)

@Rule public MockitoRule rule = MockitoJUnit.rule().silent();

For JUnit 5 tests you can silence this exception using this annotation provided in mockito-junit-jupiter package:

[FIXED] Unnecessary Stubbing in test class when writing unit test in junit using mockito

Issue

A method already exists as part of a module in the project. I am trying to write a test case to improve coverage. The method and it’s associated class is :

@Component public class GenericRestTemplate { @Autowired private RestTemplate restTemplate; @Autowired CtmLogger ctmLogger; public R persistGenericModelsAsync(T requestModel, Class responseModel, String url, String postCookies) throws JsonProcessingException { ctmLogger.debugObject(ValueConstant.SHOPPING_CART_SERVICE_NAME,”REST call”, url); HttpMethod method = HttpMethod.POST; Class responseType = responseModel; ResponseEntity response = null; HttpHeaders headers = getHeaders(postCookies); HttpEntity requestEntity = new HttpEntity<>(requestModel, headers); response = restTemplate.exchange(url, method, requestEntity, JsonNode.class); ctmLogger.debugObject(ValueConstant.SHOPPING_CART_SERVICE_NAME,”response”, response); List cookies = response.getHeaders().get(ValueConstant.SET_COOKIE); ctmLogger.info(“test:”, cookies.toString()); JsonNode responseBody = response.getBody(); for (String cookie : cookies) { System.out.println(cookie); if (cookie.startsWith(((ValueConstant.TX_CART_ID)))) { ((ObjectNode) responseBody).put(ValueConstant.COOKIES, cookie); } } ObjectMapper objectMapper = new ObjectMapper(); objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false); if ( response.getBody() != null) { System.out.println(“entered here”); return objectMapper.treeToValue(response.getBody(), responseType); } return (R) response.getBody(); } private HttpHeaders getHeaders(String cartIdCookies) { HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_JSON); headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON)); headers.add(HttpHeaders.COOKIE, cartIdCookies); headers.add(HttpHeaders.HOST, “www-sit-g1.dell.com”); return headers; }

Now I am trying to write a test case for persistGenericModelsAsync() . The code is below:

@RunWith(MockitoJUnitRunner.class) public class GenericRestTemplateTest { @InjectMocks GenericRestTemplate genericRestTemplate; @Mock RestTemplate restTemplate; @Mock CartRequest request; @Mock HttpEntity requestEntity; @Mock ResponseEntity response; @Mock HttpHeaders headers; @Mock List cookies; @Mock JsonNode responseBody; @Mock ObjectMapper objectMapper; @Mock CartResponse cartResponse; @Mock CtmLogger ctmLogger; @Mock JsonNode jsonNode; @Mock ObjectNode objectNode; @Before public void setup() { cookies = Arrays.asList(“TxCartIdtest”, “test”); } @Test public void persistGenericModelsAsync() throws JsonProcessingException { when(restTemplate.exchange(Mockito.anyString(), Mockito.eq(HttpMethod.POST), Mockito.any(HttpEntity.class), Mockito.eq(JsonNode.class))).thenReturn(response); when(response.getHeaders()).thenReturn(headers); List cookiesTest = Arrays.asList(“TxCartIdtest”, “test”); when(headers.get(ValueConstant.SET_COOKIE)).thenReturn(cookiesTest); when(response.getBody()).thenReturn(jsonNode); }

The stack trace for the error is :

org.mockito.exceptions.misusing.UnnecessaryStubbingException: Unnecessary stubbings detected in test class: GenericRestTemplateTest Clean & maintainable test code requires zero unnecessary code. Following stubbings are unnecessary (click to navigate to relevant line of code): 1. -> at com.dell.ctm.cart.util.GenericRestTemplateTest.persistGenericModelsAsync(GenericRestTemplateTest.java:81) 2. -> at com.dell.ctm.cart.util.GenericRestTemplateTest.persistGenericModelsAsync(GenericRestTemplateTest.java:82) 3. -> at com.dell.ctm.cart.util.GenericRestTemplateTest.persistGenericModelsAsync(GenericRestTemplateTest.java:84) 4. -> at com.dell.ctm.cart.util.GenericRestTemplateTest.persistGenericModelsAsync(GenericRestTemplateTest.java:85) Please remove unnecessary stubbings or use ‘lenient’ strictness. More info: javadoc for UnnecessaryStubbingException class.

I am trying to mock a list of cookies and trying to see if the method is executing and covering all the statements within it. But it is throwing this Unnecessary Stubbing Exception. Where have I stubbed unnecessarily?

Solution

@Test public void persistGenericModelsAsync() throws JsonProcessingException { //stubbed – but never used when(restTemplate.exchange(Mockito.anyString(), Mockito.eq(HttpMethod.POST), Mockito.any(HttpEntity.class), Mockito.eq(JsonNode.class))).thenReturn(response); //stubbed – but never used when(response.getHeaders()).thenReturn(headers); List cookiesTest = Arrays.asList(“TxCartIdtest”, “test”); //stubbed – but never used when(headers.get(ValueConstant.SET_COOKIE)).thenReturn(cookiesTest); //stubbed – but never used when(response.getBody()).thenReturn(jsonNode); }

Its clear that, none of the stubs you created with when() is getting used any where. For Eg. , the first stub where you return a response object – you have never used a call to restTemplate.exchange() any where in test execution of this method.

When you use the strict stubbing mode, you need to make sure – you use any stub that you create. See more here

Answered By – Kris Answer Checked By – Mary Flores (JavaFixing Volunteer)

Fixing Mockito UnnecessaryStubbingException with JUnit5

After upgrading to JUnit 5, you may bump into some unit tests now failing with the following error :

org.mockito.exceptions.misusing.UnnecessaryStubbingException: Unnecessary stubbings detected. Clean & maintainable test code requires zero unnecessary code. Following stubbings are unnecessary (click to navigate to relevant line of code): …

JUnit 5 is tricter regarding stubbing. As explained in the error message, unnecessary stubbing is not a good practice. It usually results from copy and paste, and creates confusion about the tested behaviour. In such a situation, you just want to remove the unnecessary stubbing.

However, there are some cases when you’d like a less strict approach. For example, when you use a helper method that does some mocking that is required by most of the cases, but not all. Than you have to choices :

instead of mocking directly with “when(…).then(…)”, prefix the call with lenient(). Ex

lenient().when(oauth.getAuthorities()).thenReturn(authorities);

lenient().when(oauth.getAuthorities()).thenReturn(authorities); else, annotate your test class with :

@MockitoSettings(strictness = Strictness.LENIENT)

It will relax the mockito stubbing rules.

Detect unnecessary stubbings · Issue #558 · mockk/mockk

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How should I handle a UnnecessaryStubbingException that is sensitive to ordering in underlying data structures?

What is the proper way to do this so the underlying order of operations (we’re dealing with Sets and Maps here, nothing else) is not a factor in the test?

It may be true that in this specific example I’ve set up, it’s not necessary to stub the first user. But that could be misleading in the future; I want the stub to exist, and it’s not because of “lenience,” IMO. I could also suspend the first user instead of the second, but it doesn’t explicitly address this subtlety, and it could come up again later, confusing developers.

…then Mockito is happy. As opposed to just switching “userid” and “otheruserid” ; there Mockito is still unhappy, presumably because that’s not where the order is determined later.

I believe this is because in PadlockUtil::getKeychains , the suspended user is encountered before the OK user, so Mockito is complaining that the OK user didn’t need to be stubbed.

Lenient mocks are what you want, if you can’t just use a real UserKeychain.

Mockito.lenient().when(userKeychain.getUserStatus()).thenReturn(UserState.OK); Mockito.lenient().when(otherUserKeychain.getUserStatus()).thenReturn(UserState.SUSPENDED);

Mockito is designed to replace systems where you can’t use the real system in your test, particularly in systems that predictably invoke services instead of getting properties from data objects (or other idempotent actions). Because your system doesn’t call those methods in a deterministic order, and because the calls aren’t expensive and don’t have side effects, I would recommend just going with the “lenient” option.

Imagine this case instead, where you are testing deleting user 1001 :

when(userRpc.deleteUser(1001)).thenReturn(RPC_SUCCESS); when(userRpc.deleteUser(1002)).thenReturn(RPC_SUCCESS); // unnecessary

The test might pass if you ever delete the wrong user: Over-stubbing has masked a problem. Compare with this:

when(userRpc.fetchExpensiveUserDetails(1001)).thenReturn(user1001); when(userRpc.fetchExpensiveUserDetails(1002)).thenReturn(user1002); // unnecessary

Depending on what you’re testing, this might be dangerous, but might not be so bad. Simulating a slow mobile network or with expensive data, maybe it is entirely against spec for you to fetch too much. However, in other cases, it may be acceptable. Finally, compare this case:

when(calculationResult.getRealComponent()).thenReturn(-1d); when(calculationResult.getComplexComponent()).thenReturn(5); when(calculationResult.getShortString()).thenReturn(“-1 + 5i”);

calculationResult looks an awful lot like a data object, and it is probably not a critical part of your test which of your methods to call or whether you’re calling all of them. This is a case where Mockito’s strict stubbing hinders you rather than helping you, and might be a case where you want to make some of those stubbings lenient. You might also choose to make the entire mock lenient, which particularly makes sense if you were to create a test helper method like stubCalculationResult(-1, 5) that prepared an entire object for you like that.

The only option better than that is to use a real object. In my example, if CalculationResult is an existing well-defined object, it may be lower risk overall to use a real one than to mock the behavior you believe at test-writing time to be correct. Similarly for your case, if you have access to a UserKeychain constructor that populates UserStatus etc, then it may be safer to use that in a test.

Mockito 2.2.7 API

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Misleading UnnecessaryStubbingException when Mockito is misused

In a certain case mockito fails to report a missing method on a mock instruction:

when(ormSupport).thenReturn(null);

The reproducible test can be found here:

https://github.com/gysel/mockito-problem/blob/master/src/test/java/ch/mgysel/mockito/MockitoProblem.java

Mockito fails the test with the following error message which is completely misleading:

org.mockito.exceptions.misusing.UnnecessaryStubbingException: Unnecessary stubbings detected in test class: MockitoProblem Clean & maintainable test code requires zero unnecessary code. Following stubbings are unnecessary (click to navigate to relevant line of code): 1. -> at ch.mgysel.mockito.MainComponent.(MainComponent.java:10) Please remove unnecessary stubbings or use ‘silent’ option. More info: javadoc for UnnecessaryStubbingException class. at org.mockito.internal.runners.StrictRunner.run(StrictRunner.java:49) at org.mockito.junit.MockitoJUnitRunner.run(MockitoJUnitRunner.java:142) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

I would expect Mockito to fail the test with the following message:

org.mockito.exceptions.misusing.MissingMethodInvocationException: when() requires an argument which has to be ‘a method call on a mock’. For example: when(mock.getArticles()).thenReturn(articles); Also, this error might show up because: 1. you stub either of: final/private/equals()/hashCode() methods. Those methods *cannot* be stubbed/verified. Mocking methods declared on non-public parent classes is not supported. 2. inside when() you don’t call method on mock but on some other object. at ch.mgysel.mockito.MockitoProblem.test(MockitoProblem.java:31)

키워드에 대한 정보 unnecessary stubbings detected

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