https://github.com/magicmark/jest-how-do-i-mock-x/tree/master/src/process-globals. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. We can give the mock function a custom name with the mockName() method. I have -. Beware that jest.restoreAllMocks() only works for mocks created with jest.spyOn() and properties replaced with jest.replaceProperty(); other mocks will require you to manually restore them. We can combine this with jest.mock() factory functions to create mocked modules that contain mocked functions. By combining expect.objectContaining and expect.arrayContaining we can do a partial match on the objects in the array: Full-stack generalist. You can even spy on setters of the properties. This test should pass because of the mock. Why are non-Western countries siding with China in the UN? RV coach and starter batteries connect negative to chassis; how does energy from either batteries' + terminal know which battery to flow back to? Returns the number of fake timers still left to run. Function mock using jest.fn () The simplest and most common way of creating a mock is jest.fn () method. This ability to "spy" on function calls is why mock functions are also called spies. Checking if a key exists in a JavaScript object? Instead of writing MySQL queries all across your code, when you need to retrieve data from 'table', you can use your Database implementation. Indicates that the module system should never return a mocked version of the specified module from require() (e.g. // With implementation, this mock returns `true`. We're now ready to mock imported functions with Jest. If you want to set the timeout for all test files, use testTimeout configuration option. In the afterEach callback, we call windowSpy.mockRestore to restore window to its original state. How to test for object keys and values with Jest? I forgot the existence of mockReturnValue() Where have you been!? You can use jest.mock (line 4) to mock the lang dependency. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Headquartered in Minneapolis, USA, the company's core competencies across multiple locations worldwide include product software development, IT consulting, data and analytics, machine learning, mobile app development, DevOps, Salesforce, and more. Optionally takes a mock implementation. latest. code of conduct because it is harassing, offensive or spammy. If you want to see the value of a regular property, simply create an .instance() of the class instead. If you want to overwrite the original function, you can use jest.spyOn(object, methodName).mockImplementation(() => customImplementation) or object[methodName] = jest.fn(() => customImplementation); Since jest.spyOn is a mock, you could restore the initial state by calling jest.restoreAllMocks in the body of the callback passed to the afterEach hook. To mock different return values depending on the test we will create a mock function. Pushing to [emailprotected]:some-project/some-repo.git To [emailprotected]:some-project/some-repo.git ! The jest object is automatically in scope within every test file. All pending "macro-tasks" that have been queued via setTimeout() or setInterval(), and would be executed within this time frame will be executed. A mock function is a function that replaces the actual implementation of a function with a "fake" (mock) implementation. You signed in with another tab or window. I'm using MobX for our state store so I have little control over class methods: If I want to write a test for store.doAnotherThing and test that store.doOneThing gets called once, I can't do it with store.doOneThing = jest.fn() as it's a read-only property (TypeError: Cannot assign to read only property 'doOneThing' of object '#'). Object.defineProperty allows you to set whether or not the property is enumerable, writable, and configurable as well as a value or a get/set (getter/setter) pair (see MDN Object.defineProperty). The function checks if that the size is lower than 10,000 bytes, and returns boolean. Once unpublished, this post will become invisible to the public and only accessible to Domagoj trekelj. Indicates that the module system should never return a mocked version of the specified module and its dependencies. Restores all mocks back to their original value. Now when Jest is running your code and gets to the @auth0/auth0-react and '../Config' code, it will respectively implement the return from the mocks rather than the actual code.. jest.fn() You'll notice above that we use jest.fn() in the @auth0/auth0-react mock. Mock functions track how they are called by external code. Wide choice of quality newly constructed flats and apartments. You can, as I said, spy on computed properties, as they are functions underneath. Enables automatic mocking in the module loader. For example: The second argument can be used to specify an explicit module factory that is being run instead of using Jest's automocking feature: When using the factory parameter for an ES6 module with a default export, the __esModule: true property needs to be specified. When this API is called, all timers are advanced by msToRun milliseconds. This is useful when you want to mock properties in certain test cases and restore the original value in others. This is different behavior from most other test libraries. This is how genMockFromModule will mock the following data types: Creates a new mock function. Creates a mock function similar to jest.fn but also tracks calls to object[methodName]. @cpojer That works great actually. The new implementation will then be used in place of the previous one when the mock is called. Array.prototype methods) to highly common utility methods (e.g. // will return 'undefined' because the function is auto-mocked. Instructs Jest to use fake versions of the global date, performance, time and timer APIs. jest mock database connection hmcs skeena crew list highland hills ranch death . The simplest way to create a Mock Function instance is with jest.fn(). This is usually useful when you have a scenario where the number of dependencies you want to mock is far less than the number of dependencies that you don't. We use mock functions to override original function behaviour with custom mock implementations. A simple jest.mock call allows us to intercept any dependency of the modules we are testing, without needing to change anything in terms of implementation. We dont want actual ObjectIds strewn around our code. Occasionally, there are times where the automatically generated mock that the module system would normally provide you isn't adequate enough for your testing needs. Given the name of a module, use the automatic mocking system to generate a mocked version of the module for you. jest mock database connection Noend Tatical Documentao para posse e porte de arma de fogo. For more details on automatic mocking see documentation of automock configuration option. underscore, lodash, array utilities, etc) and entire libraries like React.js. // creates a new mocked function with no formal arguments. Mock functions are a testing tool that allows us to track how function dependencies are called and control their return values. A custom time delta may be provided by passing a number. Equivalent to calling .mockRestore() on every mocked function. Copyright 2023 Meta Platforms, Inc. and affiliates. The classical example for a mock object is a data provider. To learn more, see our tips on writing great answers. Returns a mock module instead of the actual module, bypassing all checks on whether the module should be required normally or not. Also I started unfreezing all es6-like exports automatically. @IanEdington try adding writable: true to the defineProperty attributes object: This issue has been automatically locked since there has not been any recent activity after it was closed. Explicitly supplies the mock object that the module system should return for the specified module. Jest Documentation - jest.replaceProperty, The open-source game engine youve been waiting for: Godot (Ep. Thanks for contributing an answer to Stack Overflow! To mock an imported function with Jest we use the jest.mock() function. Instructs Jest to use fake versions of the standard timer functions (setTimeout, setInterval, clearTimeout, clearInterval, nextTick, setImmediate and clearImmediate). This allows mocked properties to be reset and restored with jest.resetAllMocks and jest.restoreAllMocks respectively. The mocked test helper provides typings on your mocked modules and even their deep methods, based on the typing of its source. Mock files in the __mocks__/ subdirectory are used to automock the modules they are adjacent to when the module is mocked with jest.mock(). Often that is not the case, so we will need tools to mock existing modules and functions instead. Usually Object.defineProperty works for everything, but the Location object is completely locked down from changes. Since Jest 22.1.0+, the jest.spyOn method takes an optional third argument of accessType that can be either 'get' or 'set', which proves to be useful when you want to spy on a getter or a setter, respectively. Note We can do that by clearing mocked functions between tests. Once unpublished, all posts by dstrekelj will become hidden and only accessible to themselves. If I use the __mocks__ This is equivalent to Date.now() if real timers are in use, or if Date is mocked. .mock property All mock functions have this special .mock property, which is where data about how the function has been called and what the function returned is kept. Step by step guide. This only works with jest-circus! With a mock function we can know the number of times the function was called, the arguments it was called with, the result it returned, and more. By using Object.defineProperty with the window object (or the document object), we can mock out the getters and setters. mock. To explain how each of these does that, consider . Testing MomentJs with Jest 2019-08-19 Andy Desmarais Testing Andy Desmarais Is a software engineer from New Hampshire, USA. We can achieve the same goal by storing the original implementation, setting the mock implementation to to original, and re-assigning the original later: In fact, this is exactly how jest.spyOn is implemented. // creates a new class with the same interface, member functions and properties are mocked. Use the jest.Mocked utility type or the jest.mocked() helper method to have your mocked modules typed. In other cases, you may want to mock a function, but then restore the original implementation: This is useful for tests within the same file, but unnecessary to do in an afterAll hook since each test file in Jest is sandboxed. The most common use of this API is for specifying the module a given test intends to be testing (and thus doesn't want automatically mocked). Mock frameworks allow us to create mock objects at runtime and define their . To reuse mocks with Jest we create mocks in a __mocks__/ subdirectory adjacent to the module we want to mock. Note However, on extremely rare occasions, even a manual mock isn't suitable for your purposes and you need to build the mock yourself inside your test. jest.isolateModules(fn) goes a step further than jest.resetModules() and creates a sandbox registry for the modules that are loaded inside the callback function. Dokku, The smallest PaaS implementation youve ever seen. for any backend apps and databases. Already on GitHub? One example when this is useful is when you want to mock a module differently within the same file: Using jest.doMock() with ES6 imports requires additional steps. I was encountering this when mocking methods on the knex.js database client. Its useful to testing code that uses things like Mongos ObjectId. Additionally, if those micro-tasks themselves schedule new micro-tasks, those will be continually exhausted until there are no more micro-tasks remaining in the queue. I18nextProvider. So, calling jest.mock('./math.js'); essentially sets math.js to: From here, we can use any of the above features of the Mock Function for all of the exports of the module: This is the easiest and most common form of mocking (and is the type of mocking Jest does for you with automock: true). Follow these if you don't want to use require in your tests: When using babel-jest, calls to unmock will automatically be hoisted to the top of the code block. Read more about solitary unit tests in the previous article: How to write unit tests in JavaScript with Jest. Mocking user modules. In the afterEach callback, we call windowSpy.mockRestore to restore window to its original state. Mock properties are "spies" that let you control the behavior of a property that is accessed indirectly by some other code. jest.isolateModules(fn) goes a step further than jest.resetModules() and creates a sandbox registry for the modules that are loaded inside the callback function. When using babel-jest, calls to disableAutomock will automatically be hoisted to the top of the code block. This is useful to isolate specific modules for every test so that local module state doesn't conflict between tests. In Node environment process.nextTick() and in JSDOM environment requestAnimationFrame(), cancelAnimationFrame() will be also replaced. Have you tried mocking imported functions with Jest before? * Custom implementation of a module that doesn't exist in JS. Thanks a ton :). Are you sure you want to create this branch? Stretch Film Division. To change the mock implementation of a function with Jest we use the mockImplementation() method of the mocked function. How do I loop through or enumerate a JavaScript object? Please open a new issue for related bugs. This must live at the top-level of a test file or in a describe block. While these are the most common matcher methods for functions, there are more matcher methods available in the Jest API docs. Can you please make a post. In this article well review the Mock Function, and then dive into the different ways you can replace dependencies with it. The default timeout interval is 5 seconds if this method is not called. info The TypeScript examples from this page will only work as documented if you explicitly import Jest APIs: In this. factory and options are optional. The simplest way to create a Mock Function instance is with jest.fn(). * every 20 milliseconds. jest mock database connection jest mock database connection (No Ratings Yet) . Accepts a value that will be result of a single access to the mocked property. What are some tools or methods I can purchase to trace a water leak? // The mock factory returns a mocked function, // For this test we'll mock isInteger to return `false`, passes if value is recognised as integer and is at least 18, // For this test we'll mock isInteger to return `true`, // We expect isInteger to be called with 123, // Clear the mock so the next test starts with fresh data, // Without clearing, there would be 2 calls total at this point, // Logs "mockBar", no need for a mock factory, Testing JavaScript with Jest (3 Part Series), How to create a binary decision tree in JavaScript, 9 Projects You Can Do To Become a Frontend Master. This makes it easier to tell mocked functions apart and debug code that isn't matching expectations. This is useful when dealing with a lot of repetition in setting up mocks such as when mocking common dependencies or configuration objects because it makes writing a mock factory function unnecessary. Returns the actual module instead of a mock, bypassing all checks on whether the module should receive a mock implementation or not. all tasks queued by setTimeout() or setInterval() and setImmediate()). If any of the currently pending macro-tasks schedule new macro-tasks, those new tasks will not be executed by this call. This way we can control how the implementation of a mock behaves depending on what we're testing. The methods in the jest object help create mocks and let you control Jest's overall behavior. // creates a new empty array, ignoring the original array. Beware that jest.restoreAllMocks() only works when the mock was created with jest.spyOn; other mocks will require you to manually restore them. Hit me up on twitter, Stack Overflow, or our Discord channel for any questions! Note If those tasks themselves schedule new tasks, those will be continually exhausted until there are no more tasks remaining in the queue. ES6 classes are constructor functions with some syntactic sugar. Enables automatic mocking in the module loader. Creates a new property with the same primitive value as the original property. jest.isolateModulesAsync() is the equivalent of jest.isolateModules(), but for async callbacks. Clears the mock.calls, mock.instances and mock.results properties of all mocks. This functionality also applies to async functions. Jest also provides mock function methods for resetting and restoring mocked functions, as well as shorthands for creating mocked functions that directly return, resolve, or reject a value. The jest object is automatically in scope within every test file. What was your experience like? For example: A mock function that has been instantiated twice would have the following mock.instances array: const mockFn = jest.fn(); const a = new mockFn(); const b = new mockFn(); Creates a new empty array, ignoring the original. Built with Docusaurus. Engineer and teacher. Disables automatic mocking in the module loader. Dealing with hard questions during a software developer interview, Ackermann Function without Recursion or Stack. Therefore, any mock for an ES6 class must be a function or an actual ES6 class (which is, again, another function). Creates a new empty array, ignoring the original. mockFn.mock.instances An array that contains all the object instances that have been instantiated from this mock function using new. It's good practice to name mocked functions in cases where a lot of different mocks are used. // will return 'undefined' because the function is auto-mocked. Is lock-free synchronization always superior to synchronization using locks? Returns a new, unused mock function. They do not have an effect on the code in development or production. jest spy on constructor and methods jest spy on constructor jest mock constructir jest mock object methods jest mock class methods mock data with jest jest mock local class jest mock constructotr jest mock include mock class instance jest jest mock a class example class component mock function jest jest-mock interface different mocks jest . that it should always return the real module). For example, you may call jest.useRealTimers() inside afterEach hook to restore timers after each test: Exhausts the micro-task queue (usually interfaced in node via process.nextTick). Has Microsoft lowered its Windows 11 eligibility criteria? I extended @cpojer's suggestion to allow undoing the mock: Adding to the above (#2227 (comment)), this also comes up when trying to mock built in node globals. The jest.mock API's second argument is a module factory instead of the expected exported module object. See example. // Require the original module to not be mocked // > false (Both sum modules are separate "instances" of the sum module.). Use autoMockOff() if you want to explicitly avoid this behavior. This post goes through how to use Object.defineProperty to mock how constructors create methods, ie. You can't spy on class properties, but I don't find it useful anyway. didn't know about it. Tearing down actions include dropping the test database. Getting started with Cordova Hybrid Apps 8 years ago Are you a web developer but fancy getting started with apps? Distance between the point of touching in three touching circles. What is the most efficient way to deep clone an object in JavaScript? jest.spyOn was not working for me since I was spying on read-only property from a mocked class. Exhausts all tasks queued by setImmediate(). There are three main types of module and function mocking in Jest: Each of these will, in some way, create the Mock Function. what is the way ? Calling jest.useFakeTimers() once again in the same test file would reset the internal state (e.g. // creates a deeply cloned version of the original object. Keep in mind that this is a global operation and will affect other tests within the same file. Executes only the macro-tasks that are currently pending (i.e., only the tasks that have been queued by setTimeout() or setInterval() up to this point). Automocking the module will suffice for most testing scenarios you come up with, since it allows you to separate behavior of the module from the way your . This is useful to isolate specific modules for every test so that local module state doesn't conflict between tests. Given the name of a module, use the automatic mocking system to generate a mocked version of the module for you. Jest can be used to mock ES6 classes that are imported into files you want to test. If you've done your homework from the previous article, try continuing from where you left off. Leave it a star if youre a fan . He has used JavaScript extensively to create scalable and performant platforms at companies such as Canon, Elsevier and (currently) Eurostar. 25 Feb/23. rev2023.3.1.43269. underscore/lodash, array utilities, etc) and entire libraries like React.js. Instructs Jest to restore the original implementations of the global date, performance, time and timer APIs. We recommend using StackOverflow or our discord channel for questions. Accepts a value that should be result of accessing the mocked property. to call jest.spyOn to mock the get global function in the beforeEach callback. With this and Jest Expect, its easy to test the captured calls: and we can change the return value, implementation, or promise resolution: Now that we covered what the Mock Function is, and what you can do with it, lets go into ways to use it. If no implementation is provided, calling the mock returns undefined because the return value is not defined. Work fast with our official CLI. Creates a mock property attached to object [propertyName] and returns a mock property spy object, which controls all access to the object property. Recently, I joined Jest as a collaborator to help triage the issue tracker, and Ive noticed a lot of questions about how mocking in Jest works, so I thought I would put together a guide explaining it. This function is not available when using legacy fake timers implementation. Unflagging dstrekelj will restore default visibility to their posts. When working with git a selection of GitLab, GitHub, BitBucket and rebase-trigger-happy colleagues/collaborators, its a rite of passage to see a message like the following: he/him. Exhausts the micro-task queue (usually interfaced in node via process.nextTick). We want to mock an Object, with methods on it, without the methods appearing when people enumerate through it. It can also be imported explicitly by via import {jest} from '@jest/globals'. isAtLeast18() will now always return false no matter what we call it with, because the isInteger() mock is set to always return false. Also see documentation of the configuration option for more details. Jest Array of objects partial match with arrayContaining and objectContaining In keeping with the user example, what if we wanted to check that we have the right ids for a list (array) of users. To mock properties that are defined as getters or setters, use jest.spyOn(object, methodName, accessType) instead. 'git pull') hint: before pushing again. If you truly want to mock the getter aspect of your dependency, you can provide a mock getter using Object.defineProperty. Loop through or enumerate a JavaScript object mock implementation of a property that is accessed indirectly by some code... Or the document object ), we call windowSpy.mockRestore to restore the original implementations of actual. Be used in place of the class instead on writing great answers test files use! That, consider become invisible to the module should receive a mock module instead of a function replaces. Is different behavior from most other test libraries jest mock object property to manually restore them tests in with! Conduct because it is harassing, offensive or spammy getter using Object.defineProperty with the window object or. Get global function in the afterEach callback, we can control how the of... Using Object.defineProperty object ( or the document object ), cancelAnimationFrame ( ) and setters developer fancy. Details on automatic mocking system to generate a mocked version of the configuration option that contain mocked functions apart debug! Tools or methods I can purchase to trace a water leak if I the... You left off mock returns ` true ` to synchronization using locks used place! Other test libraries access to the mocked function if this method is the... And its dependencies spying on read-only property from a mocked class timer APIs their values! Dstrekelj will become hidden and only accessible to themselves spying on read-only property from a mocked version of global... Git commands accept both tag and branch names, so creating this branch are in use, or if is... Reset the internal state ( e.g mocked version of the code block this when mocking on. The objects in the Jest object is completely locked down from changes mocked test provides! A module, bypassing all checks on whether the module system should never a... This branch may cause unexpected behavior method to have your mocked modules and functions.! On class properties, but I do n't find it useful anyway creating a mock module instead the! Only work as documented if you 've done your homework from the previous one when the returns! Become invisible to the public and only accessible to themselves indirectly by some other.. As the original array is a module, use the automatic mocking system to generate a version! ) ( e.g actual module, bypassing all checks on whether the module system should never return mocked! That replaces the actual module, use testTimeout configuration option for more details then used! Object keys and values with Jest is accessed indirectly by some other code common utility methods e.g! Deep methods, ie using StackOverflow or our Discord channel for any questions off! Because the return value is not defined to highly common utility methods ( e.g, methodName accessType! With jest.resetAllMocks and jest.restoreAllMocks respectively calls is why mock functions are a testing tool that allows us to a..., member functions and properties are `` spies '' that let you jest mock object property the behavior a... Hidden and only accessible to Domagoj trekelj computed properties, but I do n't find it useful.... The object instances that have been instantiated from this mock returns undefined the... This article well review the mock was created with jest.spyOn ; other mocks will require you to manually restore.!, try continuing from where you left off, simply create an.instance ( on... Will restore default visibility to their posts in scope within every test file indicates the. These does that, consider unpublished, this post goes through how to test for keys. Jest.Spyon ( object, methodName, accessType ) instead a deeply cloned version of the global date performance... Mock implementation of a module, use the automatic mocking see documentation of the block! When you want to mock properties are mocked function behaviour with custom mock.. Need tools to mock properties that are defined as getters or setters use! Game engine youve been waiting for: Godot ( Ep never return a jest mock object property... Jest.Fn ( ) only works when the mock function instance is with jest.fn ( factory... Node via process.nextTick ) when this API is called only work as documented if you want to jest mock object property. It is harassing, offensive or spammy unexpected behavior different mocks are used classes are functions! Timeout interval is 5 seconds if this method is not called everything, but Location! On the knex.js database client called and control their return values works when the object. Through how to write unit tests in JavaScript with Jest 2019-08-19 Andy Desmarais a... Ever seen of accessing the mocked test helper provides typings on your mocked and. Dive into the different ways you can even spy on computed properties, as said... Number of fake timers implementation libraries like React.js, calls to object [ methodName ] __mocks__/ subdirectory adjacent to module! Our code functions to override original function behaviour with custom mock implementations also be imported by... Connection Jest mock database connection Jest mock database connection ( no Ratings Yet ) methods appearing people! Array: Full-stack generalist windowSpy.mockRestore to restore window to its original state argument... Platforms at companies such as Canon, Elsevier and ( currently ) Eurostar it should always return the module. Than 10,000 bytes, and then dive into the different ways you can provide a mock is! Mocking see documentation of the actual module, use the mockImplementation ( ), we call windowSpy.mockRestore to the! Checks if that the module should be required normally or not 've done your homework from the article! Tried mocking imported functions with some syntactic sugar homework from the previous article, try continuing from where you off... This ability to `` spy '' on function calls is why mock functions to override original behaviour. Underscore/Lodash, array utilities, etc ) and setImmediate ( ), call! ) will be also replaced to highly common utility methods ( e.g member and! Avoid this behavior dependency, you can use jest.mock ( ) Jest to use Object.defineProperty to mock an imported with! Control Jest & # x27 ; timeout for all test files, jest.spyOn! You a web developer but fancy getting started with Cordova Hybrid Apps 8 years ago are sure... // with implementation, this mock returns undefined because the function is auto-mocked tasks remaining in the beforeEach callback jest.resetAllMocks! ) or setInterval ( ) will be also replaced invisible to the of! Provides typings on your mocked modules that contain mocked functions previous article, try continuing where... When you want to test for object keys and values with Jest before underscore, lodash array. Computed properties, jest mock object property they are functions underneath is completely locked down from changes PaaS! Change the mock was created with jest.spyOn ; other mocks will require you to manually restore them a. Returns undefined because the function is auto-mocked the function is a module, use __mocks__... Can be used to mock how constructors create methods, ie note if tasks... To use fake versions of the configuration option for more details on automatic see..., cancelAnimationFrame ( ) factory functions to create mock objects at runtime and define their useful you! Return the real module ) msToRun milliseconds to see the value of a mock function custom... Our terms of service, privacy policy and cookie policy called spies the typing of its.... Privacy policy and cookie policy write unit tests in JavaScript with Jest terms of service privacy... Typing of its source jest.mock ( ) helper method to have your mocked modules typed extensively create... E porte de arma de fogo that by clearing mocked functions between tests indirectly by some code. Previous article, try continuing from where you left off Documentao para e! By passing a number be also replaced have been instantiated from this page will only work as if. Code in development or production never return a mocked version of the currently pending schedule! Or spammy function instance is with jest.fn ( ) or setInterval ( method! Hills ranch death Overflow, or if date is mocked original object lock-free! Connection Noend Tatical Documentao para posse e porte de arma de fogo dependencies with it on the! Instantiated from this mock function be required normally or not the properties want explicitly. This mock returns ` true ` place of the module should be result of accessing mocked... Mock how constructors create methods, based on the objects in the Jest API docs: this. Location object is automatically in scope within every test file would reset internal! Or the jest.Mocked utility type or the jest.Mocked ( ) ) similar to jest.fn but tracks... Member functions and properties are mocked for a mock function instance is with (! Original state themselves schedule new tasks will not be executed by this call async callbacks the most common way creating! I said, spy on computed properties, but I do n't find it anyway! Development or production function checks if that the module system should return for the module. How the implementation of a test file your Answer, you agree our! Commands accept both tag and branch names, so we will create a mock object that the module should! Pushing again I said, spy on computed properties, as I said, spy on properties... Down from changes the smallest PaaS implementation youve ever seen ) instead APIs: in this article well review mock. ( ) method like React.js class properties, but I do n't find it useful anyway in... Dependencies with it done your homework from the previous article: how to test for object keys values...
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