Check out our offerings for compute, storage, networking, and managed databases. Making statements based on opinion; back them up with references or personal experience. You get paid; we donate to tech nonprofits. As the description of the project says, it let a coder write in a fluent line of code catching the exception and offer this exception for the latter assertion. You were trying to do two things in your test: check for valid and faulty input. Github / Stackoverflow / Maven . shouldReturnErrorResponseWhenFailedToUploadFile(), TransactionToApply newTransactionThatFailsWith( Exception error ), when( transaction.additionalHeader() ).thenReturn(, // allow to build validated index updates but fail on actual tx application, txId = ThreadLocalRandom.current().nextLong(, shouldWrapIOExceptionsCarefullyBecauseCriticalInformationIsOftenEncodedInTheirNameButMissingFromTheirMessage(), "unable to load database: FileSystemException: the-message". Catch an exception with assertThrows JUnit5 includes an Assertion that you can use to verify thrown exceptions. DigitalOcean makes it simple to launch in the cloud and scale up as you grow whether youre running one virtual machine or ten thousand. When we need to verify some other properties of the exception, we can use the ExpectedException rule. Take a look at the following code snippet. To learn more, see our tips on writing great answers. Mockito How to mock and assert a thrown exception? Rename .gz files according to names in separate txt-file. In this quick tutorial, we'll be looking at how to test if an exception was thrown using the JUnit library. assertThrows () requires two arguments, Class <T> and Executable, assertThrows () can also take an optional third argument of either String or Supplier<String . Mockito alone is not the best solution for handling exceptions, use Mockito with Catch-Exception If you want to test the exception message as well you can use JUnit's ExpectedException with Mockito: to assert . Take a look at the following code snippet. How i can stop call a method void with mockito? Already on GitHub? Have a question about this project? 1. If you're using JUnit 4, you can annotate your test with, to assert that an exception has occured. We can use Mockito verify methods at the end of the testing method code to make sure that specified methods are called. Why is processing a sorted array faster than processing an unsorted array? Mockito alone is not the best solution for handling exceptions, use Mockito with Catch-Exception, To answer your second question first. Remember The canonical reference for building a production grade API with Spring, THE unique Spring Security education if youre working with Java today, Focus on the new OAuth2 stack in Spring Security 5, From no experience to actually building stuff, The full guide to persistence with Spring Data JPA, The guides on building REST APIs with Spring. You can explore MongoDB through their free forever cluster - Atlas. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. String str = null; assertThrows(NullPointerException.class . Example using @test (expected) Question, mockk, how to verify a specific exception is thrown. Find centralized, trusted content and collaborate around the technologies you use most. The executable can be a Lambda expression, method reference, or implementation of the Executable interface. Is variance swap long volatility of volatility? And even if it was based on Mockito 2 in the current version, this would require to declare a global mock maker (inline-mock-maker), something that may not what you want, as this mock maker has different drawbacks that the regular mock maker. stubbed. Which annotation is used to indicate a mock object in Mockito? In this example there is a basic method called getUserById() which will return a user and there is a total of 3 unit of works. Catch a specific exception with assertThrowsExactly, Verifying a specific exception is not thrown with assertDoesNotThrow, Using assertAll to verify multiple Executables, Setting the order of Tests in JUnit5 and JUnit4, Mock final classes and methods with Mockito, Verify thrown exceptions inside tests with Junit5. Maybe try setting a breakpoint and run the test in debugmode. Your code probably calls hideProgressDialog () twice. The sorting is according to either the natural when(testingClassObj.testSomeMethod).thenThrow(new CustomException()); Using Junit5, you can assert exception, asserts whether that exception is thrown when testing method is invoked. (Java.Util.Logging), How to Set Auto-Scrolling of Jtextarea in Java Gui, How to Draw in JPAnel? Note that in JUnit 4, we needed to use @Test (expected = NullPointerException.class) syntax. Mockito Verify methods are used to check that certain behavior happened. Furthermore, it's important to note that this assertion is satisfied when the enclosed code throws an exception of type NumberFormatException or any of its derived types. Should I include the MIT licence of a library which I use from a CDN? Introduction To test a program implies adding value to it. Explanation: Mockito is a popular mocking framework used for Java applications. Working on improving health and education, reducing inequality, and spurring economic growth? The full source code for the examples is available over on GitHub. If there are no other assertions in the test method, you'll also have to do $this->expectNotToPerformAssertions(); or you'll get a warning that the test doesn't perform any assertions. We also looked at two If you want to verify that a specific exception is thrown, you will have to use assertThrowsExactly. If any method call is deleted by mistake, then verify method will throw an error. By splitting this into two method that each do one thing, you will have much clearer tests and a much better overview of where things go wrong. Questions & Answers platform. If you want to test if a particular Exception is not thrown in a condition where other exceptions could be thrown, try this: You don't have to assert if the method doesn't throw. And you can use any assertion library like Hamcrest or AssertJ. And to "mock" an exception with mockito, use. cases that verify no exception is thrown. This work is licensed under a Creative Commons Attribution-NonCommercial- ShareAlike 4.0 International License. Not the answer you're looking for? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. I know you're using NUnit, but there's a xUnit issue that describes why you don't need to assert it. It also catches any exception and writes it to the console. Here I selected the Maven project - language Java 11 - Spring Boot 2.7.8 and add Spring web dependency. An easy and short way that worked for me was: Or if your exception is thrown from the constructor of a class: Unrelated to mockito, one can catch the exception and assert its properties. privacy statement. Why Is PNG file with Drop Shadow in Flutter Web App Grainy? The original answer for JUnit <= 4.12 was: Though answer has more options for JUnit <= 4.12. Connect and share knowledge within a single location that is structured and easy to search. For checking the cause of the exception, I use: expectedException.expectCause(Mockito.sameInstance(expectedException)) or expectedException.expectCause(Mockito.instanceOf(MyException.class)) and a few others that come in handy. In this article, we explored how to configure method calls to throw an exception in Mockito. Verify that the correct methods of our mock objects were invoked. By clicking Sign up for GitHub, you agree to our terms of service and Sign up for Infrastructure as a Newsletter. A sample of this could be the IllegalArgumentException which is caught with the @Test(expected = IllegalArgumentException.class) annotation. Get started with Spring 5 and Spring Boot 2, through the Learn Spring course: >> CHECK OUT THE COURSE Comments are closed on this article! While we believe that this content benefits our community, we have not yet thoroughly reviewed it. The text was updated successfully, but these errors were encountered: You can verify the type of the parameter being passed in several different ways: @Raibaz thank you for the prompt response, the help is great! For example there is an object method that throws exception if you call it the second time. Introducing assertThrows () In JUnit 5, the above two methods of handling and verifying exceptions have been rolled into the much more straightforward and easier to use assertThrows (). In JUnit 5, to write the test code that is expected to throw an exception, we should use Assertions.assertThrows (). Why are non-Western countries siding with China in the UN? Should I include the MIT licence of a library which I use from a CDN? Mockito provides the capability to a mock to throw exceptions, so exception handling can be tested. Allows verifying exact number of invocations. And you need to test to test that it does throw exception during the second method call, not the first one. Learn how to use AssertJ for performing assertions on exceptions. This takes the type of the expected exception and an Executable functional interface where we can pass the code under test through a lambda expression: If the expected exception is thrown, assertThrowsreturns the exception, which enables us to also assert on the message. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. AssertJ has been updated to provide a nice fluent API to assert exceptional behaviour. Invalid: java.lang.Exception: Cannot process at com.logicbig.example.ProcessorTest.processTest (ProcessorTest.java:13) (Don't forget to add a fail() assertion before the catch block). To mock and assert a thrown exception in Mockito, you can use the doThrow () method and the verify () method. Author The first unit of work should test whether or not a valid user is being returned in the case of valid and invalid input.Any exceptions that are being thrown by the datasource have to be handled here: if no user is present there should be a test that demonstrates that an exception is thrown when the user can't be found. The method takes two parameters: the type of How to derive the state of a qubit after a partial measurement? Working on improving health and education, reducing inequality, and spurring economic growth? It's the test method's responsibility to catch any exceptions that occur and write them to the console, so that they don't interfere with the running Dot product of vector with camera's local positive x-axis? verify(moc, Use doAnswer() when you want to stub a void method with generic Answer. The second invocation of verifyNoMoreInteractions() will fail with the error message as: One of the great features of Mockito is the exception message, it clearly points out where our test is failing so that we can easily fix it. Testing is a costly activity. Flutter change focus color and icon color but not works. StepVerifier also provides assertions on exception by expectError() API and supports the assertion of the element before errors are thrown in a Flux of elements that can not be achieved by block(). throw an exception. How to verify that a specific method was not called using Mockito? This article looked at different ways to catch exceptions and verify their content. 2023 ITCodar.com. (resumableListener).onBytesReceived(any()); "State should be ABORT if the resumableListener threw an exception in onBodyPartReceived", shouldGiveAClearMessageIfTheArchiveDoesntExist(). Testing means raising the reliability and quality of the program. you can assert exception class Name as below. Here's an example of how you might use this in a test case: In this example, we set up a mock object of type MyClass and configure it to throw a RuntimeException when its someMethod method is called. . @MariuszS response correctly answers what you are saying is unrelated to Mockito. worked for meAlso we can check the exception message as well.assertThatThrownBy(() -> myService.sumTingWong("badArg")).hasMessage("test") .isInstanceOf(IllegalArgumentException.class); this does not work if the method doSomething() return type is void? If you want to test the exception message as well you can use JUnit's ExpectedException with Mockito: If you're using JUnit 4, and Mockito 1.10.x rev2023.3.1.43269. Are there conventions to indicate a new item in a list? Mockito - Verifying Behavior Previous Page Next Page Mockito can ensure whether a mock method is being called with reequired arguments or not. is there a chinese version of ex. Learn to configure a method call to throw an exception in Mockito. https://javadoc.io/doc/org.mockito/mockito-core/5.1.1/package-list Close When we write unit tests that use mock objects, we follow these steps: Configure the behavior of our mock objects. But even though the exception might be thrown in the next test, the exception message contains a navigable stack trace element with location of the defect. exception thrown, No exception is thrown, and assert that list of Executable's don't throw an exception. Why does awk -F work for most letters, but not for the letter "t"? verifyException ( () -> new Thing ( "baddata" )); Thanks to the community for the example. Also as the expectation is placed around in the method, depending on how the tested code is written then the wrong part of the test code can throw the exception, leading to false-positive test and I'm not sure that PMD, findbugs or Sonar will give hints on such code. from the file system (, A map that has its keys ordered. mariuszs / MyTest.java Last active 3 days ago Star 9 Fork 1 Code Revisions 4 Stars 9 Forks 1 Embed Download ZIP Mockito + Catch Exception + AssertJ - BDD Style! Why is there a memory leak in this C++ program and how to solve it, given the constraints? How would I do this in mockito and verify that I get Exception2 after forcing Exception 1 to be thrown? quite an advanced featu. Each catch block includes the exception type and can contain additional statements needed to handle that exception type. The mysql database server may not be started or shutdown. Mockito: Trying to spy on method is calling the original method. the exception won't be thrown from your test method). If you want to test the exception message as well you can use JUnit's ExpectedException with Mockito: If you're using JUnit 4, and Mockito 1.10.x to mockito Is there a way to verify that an exception was thrown while invoking some method? Sometimes though, you might want to validate the framework usage explicitly. But this approach is lacking in some areas. Busque trabalhos relacionados a Illegal reflective access by org mockito internal util reflection accessibilitychanger ou contrate no maior mercado de freelancers do mundo com mais de 22 de trabalhos. If any method call is deleted by mistake, then verify method will throw an error. Just test your functionality: if an exception is thrown the test will automatically fail. Catch throwables If you want to catch both throwables and exceptions have a look at the catch-throwable packages in javadoc. - Exception handling when calling a method JythonNullpointer - Nullpointer Exception when calling a method from Jython setMod - Get an exception when calling the setMod() method InvalidUseOfMatchersException - Wierd mockito . @Test public void putFailProperException() { UnsupportedOperationException exception = new UnsupportedOperationException("Test exception on put"); willThrow (exception).given(this.cache).put(0L, 0L); this.cacheInterceptor.setErrorHandler(new SimpleCacheErrorHandler()); this.thrown.expect(is(exception)); this.simpleService.put(0L); } Use Mockito's doThrow and then catch the desired exception to assert it was thrown later. If you're using JUnit 4, you can annotate your test with. What is important to realize is that one unit of work usually isn't just one method but at the very basic level it is one method and after that it is encapsulated by other unit of works. Or should I use "expectedExceptions" argument of org.testng.annotations.Test annotation? Processor processor = Mockito.mock (processor.class); // TODO: Find out what exception is thrown by the verify method and specifically catch that exception. Or, as defined in The art of Unit Testing, 2nd Edition by Roy Osherove, page 11: A unit test is an automated piece of code that invokes the unit of work being tested, and then checks some assumptions about a single end result of that unit. As Mockito is still not updated this library cannot work with final classes or final methods. Ok, but why would you want to verify the method called on the mocked object when youre the one that wrote the test-cases and know youve indeed called the methods that you want. There are 2 types of input: valid input and faulty input (the input is valid in the strict sense, but it's not correct). This JUnit assertion method returns the thrown exception, so we can use it to assert exception message too. Also if you remember name clash with Matcher or Assert, be prepared to meet the same clash with Assertions. If you are sure that this issue is important and should not be marked as stale just ask to put an important label. A look at assertions in both JUnit 4 and 5. Annotate your test method with: I'm using mockito in a junit test. Though in this case we can catch exception from the first method call and wrap it in RuntimeException. So these above options have all their load of caveats, and clearly not immune to coder errors. Mockito verify () methods can be used to make sure the mock object methods are being called. A new exception instance will be created for each method invocation. Was Galileo expecting to see so many stars? At this point it should be clear how we're going to handle these exceptions. mywebforum.com, Get Your Own To verify that a mock object throws an exception in Mockito, you can use the verify method and pass it a times argument to specify the number of times the method should have been called, as well as a throwable argument to specify the exception that should have been thrown. Thanks for learning with the DigitalOcean Community. The description of the third step is actually a bit misleading, because often we end up verifying that the correc Petri Kainulainen How to throw an exception in Java Mockito? Premium CPU-Optimized Droplets are now available. How can I recognize one? expected it to be. The ExpectedException rule is also an attempt to fix the previous caveats, but it feels a bit awkward to use as it uses an expectation style, EasyMock users know very well this style. @Rule public ExpectedException expectedException = ExpectedException.none(); @Test public void throwsExcept() { var message = "test exception" expectedException.expect(NullPointerException.class); Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Mockito: How to verify a specific exception was thrown from catching another exception. You can use when and thenThrow to mocke Exeption1 from someFunc, then f1() should catch exception and throw Exception2. We then call the someMethod method and catch the exception that is thrown. With the JDK8, lambdas enter the test scene, and they have proved to be an interesting way to assert exceptional behaviour. When you're unit testing it's important to define to yourself what you consider a unit of work. If no exception is thrown, your tests will all turn up green. What factors changed the Ukrainians' belief in the possibility of a full-scale invasion between Dec 2021 and Feb 2022? Thanks for learning with the DigitalOcean Community. Can the Spiritual Weapon spell be used as cover? The following test is expected to throw an exception of type ApplicationException or its subtype. Login to the mysql database server, verify the database is running or shutdown. Using mockito, you can make the exception happen. JUnit 5: How to assert an exception is thrown? If an uncaught or unexpected exception is thrown, the test will fail. You can also see what methods are called, so why use verify? @MariuszS response correctly answers what you are saying is unrelated to Mockito. method after you verif, Return the contained value, if present, otherwise throw an exception to be We will, of course, make sure to cover both the JUnit 4 and JUnit 5 versions. Mockito.when(myService.doSomething()).thenThrow(new Exception("Cannot process")); then we will have following runtime exception: org.mockito.exceptions.base.MockitoException: Checked exception is invalid for this method! Learn more. 2023 DigitalOcean, LLC. At some point the project relied on FEST-Assert the ancestor of AssertJ. Its the same as calling with times(1) argument with verify method. when(testingClassObj.testSomeMethod).thenThrow(new CustomException()); Using Junit5, you can assert exception, asserts whether that exception is thrown when testing method is invoked. For "Visual Studio Team Test" it appears you apply the ExpectedException attribute to the test's method. By adding another test (nonExistingUserById_ShouldThrow_IllegalArgumentException) that uses the faulty input and expects an exception you can see whether your method does what it is supposed to do with wrong input. You can look at more Mockito examples from our GitHub Repository. Here is a simple example showing how to assert exception in JUnit 5. We can test expected exceptions using JUnit 5 assertThrows assertion. In the following Aside from that it may suffer from the same issue as the @Test way, depending on where you place the expectation. Then in our test, we're asserting that the code that attempts to parse an Integer value will result in a NumberFormatException with the message For input string. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Well occasionally send you account related emails. The catch-throwable packages in javadoc test '' it appears you apply the ExpectedException attribute to mysql. Do n't need to assert that list of Executable 's do n't throw exception. Returns the thrown exception be prepared to meet the same as calling with (. Specific exception is thrown, the test 's method message too can catch exception from the system! Xunit issue that describes why you do n't need to assert exceptional behaviour easy to search - Boot... Exeption1 from someFunc, then f1 ( ) methods can be tested unexpected exception is thrown, No is... Improving health and education, reducing inequality, and they have proved to be an interesting way assert... Appears you apply the ExpectedException attribute to the console 5: how verify! Implies adding value to it use it to assert exceptional behaviour project relied on FEST-Assert the ancestor of.. Mock to throw an exception is thrown the test code that is thrown Next Page Mockito can ensure a... Single location that is structured and easy to search at this point it should be clear how we going... Consider a unit of work Page Next Page Mockito can mockito verify exception thrown whether a mock object methods are called, exception! Include the MIT licence of a full-scale invasion between Dec 2021 and Feb 2022 Weapon spell be used cover... Should use Assertions.assertThrows ( ) changed the Ukrainians ' belief in the possibility of library. And 5 apply the ExpectedException attribute to the mysql database server, verify the database is running or shutdown with... Team test '' it appears you apply the ExpectedException rule than processing an unsorted array, privacy and! First method call to throw an exception was thrown using the JUnit library to use @ test ( expected IllegalArgumentException.class. To spy on method is calling the original method any assertion library like or. Separate txt-file know you 're unit testing it 's important to define to yourself what you consider a unit work. Exception was thrown using the JUnit library Previous Page Next Page Mockito can ensure whether a method. Assertions on exceptions can contain additional statements needed to use assertThrowsExactly AssertJ for performing on! Assertions on exceptions check out our offerings for compute, storage, networking and. Separate txt-file methods of our mock objects were invoked sometimes though, you can MongoDB., we have not yet thoroughly reviewed it define to yourself what are. Web App Grainy correctly answers what you are saying is unrelated to Mockito that list of Executable do! Assert, be prepared to meet the same as calling with times ( ). Were invoked specified methods are being called with reequired arguments or not the which! Mock objects were invoked GitHub Repository we needed to use assertThrowsExactly Java.Util.Logging ) how... To write the test will fail easy to search catches any exception and writes it to assert exception too... Derive the state of a full-scale invasion between Dec 2021 and Feb 2022 of work to put an label! You & # x27 ; re using JUnit 4, we can test exceptions! Specific exception is thrown ancestor of AssertJ Executable 's do n't throw an exception in Mockito was though. With Mockito the first one generic answer verify thrown exceptions both JUnit,. Is running or shutdown method call is deleted by mistake, then verify.! To Mockito f1 ( ) method and the community throw exceptions, mockito verify exception thrown! Framework used for Java applications way to assert exceptional behaviour all turn up green we to... 'Re going to handle these exceptions ' belief in the UN to solve it, the... Java.Util.Logging ), how to derive the state of a qubit after a partial measurement spell be used cover! It also catches any exception and writes it to assert exceptional behaviour and... Can be tested available over on GitHub or assert, be prepared to meet the same clash with Matcher assert. A method void with Mockito, you can use the doThrow ( ) methods can used! Why is there a memory leak in this quick tutorial, we have yet! Testing method code to make sure that this content benefits our community, have. Team test '' it appears you apply the ExpectedException rule two parameters: the type how! Your answer, you can look at more Mockito examples from our GitHub Repository and... Dothrow ( ) method correctly answers what you are saying is unrelated Mockito! '' it appears you apply the ExpectedException rule to the mysql database server may not be started or shutdown yourself... Expectedexceptions & quot ; argument of org.testng.annotations.Test annotation can the Spiritual Weapon spell be to... And clearly not immune to coder errors mockito verify exception thrown check that certain behavior happened spurring economic growth sure. Conventions to indicate a new exception instance will be created for each method invocation ShareAlike 4.0 License! It to the console assert exceptional behaviour mockito verify exception thrown GitHub see what methods are used to make sure that methods! @ test ( expected ) question, mockk, how to derive the state of full-scale!, or implementation of the exception type that is structured and easy to.... Things in your test method with generic answer learn more, see tips... '' it appears you apply the ExpectedException rule calls to throw an exception has occured still not updated library. Method code to make sure that specified methods are being called an uncaught or unexpected exception thrown! More options for JUnit < = 4.12 that in JUnit 5 single location that expected. Reliability and quality of the mockito verify exception thrown can be tested qubit after a partial?! Jtextarea in Java Gui, how to Draw in JPAnel includes an assertion that you can explore through! Marked as stale just ask to put an important label rename mockito verify exception thrown files according to in. Have not yet thoroughly reviewed it spell be used as cover the test code that is structured easy... Use doAnswer ( ) methods can be used to make sure that this content benefits our community we... Used as cover JUnit5 includes an assertion that you can look at the catch-throwable packages in.. Faster than processing an unsorted array, your tests will all turn up green ) method and verify! Use when and thenThrow to mocke Exeption1 from someFunc, then f1 ( ) method then verify method NullPointerException.class syntax... Color but not works forever cluster - Atlas use verify point the project relied on FEST-Assert the ancestor of.... The test 's method, networking, and spurring economic growth which I use from a CDN any. A partial measurement and assert that list of Executable 's do n't need to test if an uncaught unexpected. For `` Visual Studio Team test '' it appears you apply the rule! There conventions to indicate a mock object methods are called throw exceptions, use, be prepared to meet same... Executable can be used as cover a partial measurement open an issue and contact maintainers. And how to test a program implies adding value to it the full code! Method calls to throw an exception, so why use verify is calling the original method test '' it you. Has more options for JUnit < = 4.12 was: though answer has more options for JUnit < = was. To it NUnit, but there 's a xUnit issue that describes why you do n't to... Object methods are called, so we can test expected exceptions using JUnit 4, can! But there 's a xUnit issue that describes why you do n't need to assert an exception of type or! To make sure the mock object in Mockito at more Mockito examples from our GitHub Repository verify specific. To indicate a new exception instance will be created for each method invocation I get Exception2 forcing... Specific exception is thrown and quality of the testing method code to make sure the mock object are. Free forever cluster - Atlas processing an unsorted array the method takes two parameters: the of. For a free GitHub account to open an issue and contact its maintainers and the community exceptions JUnit... In your test method ) mock & quot ; argument of org.testng.annotations.Test annotation a and! It simple to launch in the cloud and scale up as you grow whether youre one. An exception of type ApplicationException or its subtype them up with references or personal experience yourself what you are is! Png file with Drop Shadow in Flutter web App Grainy test a program implies value. Nice fluent API to assert exception in Mockito using @ test ( expected ) mockito verify exception thrown, mockk, how Draw... Test 's method the thrown exception opinion ; back them up with references or personal experience letters but! Gui, how to derive the state of a qubit after a partial measurement (, a map has! Proved to be thrown from your test with for Infrastructure as a Newsletter MIT licence of a qubit after partial. Collaborate around the technologies you use most list of Executable 's do n't to! To provide a nice fluent API to assert an exception in Mockito when thenThrow! For compute, storage, networking, and spurring economic growth updated to provide a fluent! And share knowledge within a single location that is expected to throw an exception thrown. Being called do this in Mockito that you can look at assertions in both JUnit,... & # x27 ; re using JUnit 4, we can catch exception from the first one it you... At different ways to catch both throwables and exceptions have a look at more Mockito examples our. Method takes two parameters: the type of how to assert it type! Configure method calls to throw exceptions, use conventions to indicate a new exception instance will created... For JUnit < = 4.12 though answer has more options for JUnit =.

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