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Recently, however, I needed to create a mock that behaved differently in different unit tests, and needed to use some advanced features of React as well. It accepts a configuration object as the third parameter where you can set the value through the value property. Then you can just remove the failing modifier to make them pass. Well use exec to run arbitrary commands (eg. Warning: this will cause you to change the way you write your code just to accomodate a specific type of testing. But often you need to instruct Jest to use a mock before modules use it. WebOne of the limitations of using the module factory parameter is that jest.mock is hoisted to the top of the file so you cannot first define a variale and then use it in the factory. }, it should work like that, but I would recommend to separate the jest configuration in another file as it makes it more readable instead of a very long package.json. Second, if you want to reference a variable from the parent scope of jest.mock (you want to define your mock module instance for example), you need to prefix the variable name with mock. One downside to fully manual mocks is that they're manual meaning you have to manually update them any time the module they are mocking changes. When you are maintaining a large codebase, you may sometimes find a test that is temporarily broken for some reason. How to choose voltage value of capacitors. Coreless Stretch Film; Pre-Stretch Film; Hand Roll; Machine Roll; Jumbo Roll; Industrial Plastic Division. makeKey = newValue changes the implementation of the makeKey variable we have in our test file but doesnt replace the behaviour of lib.makeKey (which is what getTodo is calling). Mocks Math.random using Object.defineProperty. In this case, the solution is to move the manual mock into a separate file and include this one in the test before the tested file: Copyright 2023 Meta Platforms, Inc. and affiliates. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. When and how was it discovered that Jupiter and Saturn are made out of gas? This post looks at best practices around leveraging child_process.spawn and child_process.exec to encapsulate this call in Node.js/JavaScript. the function is not strictly internal, its exported and unit tested, thereforce calling through would duplicate the tests. This is a quick workaround if some other part of your system isnt developed in JavaScript. How did Dominion legally obtain text messages from Fox News hosts? Method calls are saved in theAutomaticMock.mock.instances[index].methodName.mock.calls. The array of objects API is most verbose, but it makes the type inference a painless task. You can use this type of test i.e. From simple Import interception, to how to approach stubbing out an internal function call or Mocking only part of a module (by spying…). To learn more, see our tips on writing great answers. Use test.concurrent.skip.each if you want to stop running a collection of asynchronous data driven tests. First, lets consider how we would test a module that only exports named exports. Making statements based on opinion; back them up with references or personal experience. Here are three different ways you can mock global variables like Math.random or Date.now. But we'll probably want to also spy on calls to those methods, to ensure that they were called with the expected parameters. Try to import dotenv variable "PROFILE_URL" which is not defined in any .env files. "verbose": true, Since calls to jest.mock() are hoisted to the top of the file, Jest prevents access to out-of-scope variables. }, Change color of a paragraph containing aligned equations. They can still re-publish the post if they are not suspended. As we can see tested function uses globally available window.location variables. We know MyComponent has tests that verify its behavior, and to test our App component we only want to check that it renders correctly. Let's take a look at each of them. Jest how to mock environment variable in React Native react-native-dotenv. Asking for help, clarification, or responding to other answers. as usual preferred solution should depend on a given test context. What does a search warrant actually look like? The overwrite only works for the current test suite and will not affect other tests. If you research this error a bit, you will find jest factory methods are only allowed to access a whitelisted array of object, or objects that are begin with the word Mock. To learn more, see our tips on writing great answers. Youll want to mock the operations that do I/O most of the time, the pure/business logic functions some of the time and the constants very seldom. the case with window.matchMedia(). The first solution uses the global object on which you can reassign values to mock them. Once unpublished, this post will become invisible to the public and only accessible to Alessio Michelini. Unsubscribe anytime. Do German ministers decide themselves how to vote in EU decisions or do they have to follow a government line? It helps in generating a list of web pages or search engine results. For example, let's say fetchBeverageList() returns a promise that is supposed to resolve to a list that has lemon in it. Get "The Jest Handbook" (100 pages). How can I determine if a variable is 'undefined' or 'null'? Mocking Named Exports. I am performing unit testing in React Native and when I run the test case its throwing the following error: Can anyone please help me out as how to solve it in jest? // Clears the database and adds some testing data. The mocked functions are still the same, but they now have the full type information. Jordan's line about intimate parties in The Great Gatsby? To achieve this, it depends on where and how getUserPage and canViewPage are defined. Most upvoted and relevant comments will be first, Senior Developer II at HubSpot, based in Dublin, Ireland, JavaScript Visualized: the JavaScript Engine, [Code snippets] Testing html anchor links in Cypress, How to replace the API Key with Private Apps in Hubspot. The answer is to use jest to set up up your mock, then before you run your tests, change the implementation of your Mock to your functional component: Note that because MyModule is a default export, we set up the jest factory mock with some additional data so everything behaves correctly. Once specified, moc In that case the tests will not show up as failing until they pass. Making statements based on opinion; back them up with references or personal experience. It assume that this is target source code. To spy on method calls in all of these objects, we populate playSoundFile with another mock function, and store a reference to that same mock function in our test file, so it's available during tests. Spy and stub is a recommended approach, however in case if you want to access the outside scope object, hack window variable and assign it with des This is often useful if you want to clean up some temporary state that is created by each test. I want to test the 'canViewPage method in jest. A module factory is a function that returns the mock. Just add this line at the top of your file. `extra: boolean | undefined`, // without the annotation types are incorrect, e.g. If window.matchMedia() is executed directly in the tested file, Jest reports the same error. If failing test will throw any errors then it will pass. It seems to be the cleanest solution if only you are able to apply necessary changes to the codebase. Why does the Angel of the Lord say: you have not withheld your son from me in Genesis? Imagine MyComponentdoes more than we care to manage for a simple unit test, like access local storage or make API requests. Why is there a memory leak in this C++ program and how to solve it, given the constraints? WebThis factory can take in an optional token, which is an instance token, any token which is valid for a Nest provider, and returns a mock implementation. rev2023.3.1.43269. Full-Stack Software Developer and Entrepreneur in Denver, Colorado. in beforeAll(), by calling mockImplementation() (or mockImplementationOnce()) on the existing mock instead of using the factory parameter. Also under the aliases: it.skip.failing(name, fn, timeout), xit.failing(name, fn, timeout), xtest.failing(name, fn, timeout). However, if you prefer explicit When learning these tools, something that occasionally trips up new users is figuring out what to do with complex external dependencies. ] Your whole test could be: The first argument is the test name; the second argument is a function that contains the expectations to test. "test:cov": "jest --coverage ", "description": "", Jest can be used to mock ES6 classes that are imported into files you want to test. As you can see when you run the examples/spy-internal-calls-cjs/lib.fail.jest-test.js tests, theres no way to intercept calls to makeKey. Its critical that variable name that starts with mock so that jest gives it a special treatment and allows to reference them in the hoisted calls to jest.mock ('aws-sdk', ) In your test files, Jest puts each of these methods and objects into the global environment. @sagar -- have you tried doing import * as MyAwesomeClass from ''. Co-author of "Professional JavaScript", "Front-End Development Projects with Vue.js" with Packt, "The Jest Handbook" (self-published). How to properly visualize the change of variance of a bivariate Gaussian distribution cut sliced along a fixed variable? Also under the aliases: it.only.each(table)(name, fn), fit.each(table)(name, fn), it.only.each`table`(name, fn) and fit.each`table`(name, fn). This is often useful if you want to set up some global state that will be used by many tests. ), Using an inline mock, you make a call to React.useEffect(). In order to mock a constructor function, the module factory must return a constructor function. ] The third argument (optional) is timeout (in milliseconds) for specifying how long to wait before aborting. Retrieve the current price of a ERC20 token from uniswap v2 router using web3js. describe.each allows you to write the test suite once and pass data in. Using a mock You can check https, While developing or using NPM package registry you may come across command or multiple dist tags available for one package e.g. ES6 classes are constructor functions with some syntactic sugar. This post goes through how to achieve different types of module mocking scenarios with Jest. Asking for help, clarification, or responding to other answers. The reason this doesnt work is the same as the CommonJS example, makeKey is directly referenced and that reference cant be modified from outside of the module. Asking for help, clarification, or responding to other answers. Suspicious referee report, are "suggested citations" from a paper mill? [1, 2, 3] -> [[1], [2], [3]]. If you pass in a 1D array of primitives, internally it will be mapped to a table i.e. Built with Docusaurus. when writing code in a BDD way. "description": "", This will allow calling new on the mock. Not the answer you're looking for? by @babel/preset-env. This is the recommended approach, but is completely optional. You can also run multiple tests at once by adding each after failing. What are some tools or methods I can purchase to trace a water leak? In case you are running into issues using the global object, you can also use a spy with mockReturnValueby passing the object as the first parameter, and the method as a string for the second parameter: Lastly, if none of the above solutions are suitable for you, you can also use Object.defineProperty similarly to jest.spyOn. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. If some code uses a method which JSDOM (the DOM implementation used by Jest) hasn't implemented yet, testing it is not easily possible. In order to track calls to the constructor, replace the function returned by the HOF with a Jest mock function. exec is brilliant to integrate with system binaries (where we dont care about the output). Launching the CI/CD and R Collectives and community editing features for How do I test a class that has private methods, fields or inner classes? How does a fan in a turbofan engine suck air in? . Was Galileo expecting to see so many stars? "import * as MyAwesomeClass from './utils.js' ". By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. I found the solution with setupFilesAfterEnv: // package.json as in example? Take your JavaScript testing to the next level by learning the ins and outs of Jest, the top JavaScript testing library. Also under the aliases: it.only.failing(name, fn, timeout), fit.failing(name, fn, timeout). Be aware of Temporal Dead Zone. test.skip.each is available with two APIs: Use test.todo when you are planning on writing tests. Why does Jesus turn to the Father to forgive in Luke 23:34? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. jest.mock calls cannot be hoisted to the top of the module if you enabled ECMAScript modules support. you can use jest.isolateModules(fn) to app in isolation like this: You could create an .env file just for testing. "repository": { If setup was synchronous, you could do this without beforeAll. jest.mock('path') is required, because build-in modules are not mocked by default. Testing its functionality is the responsibility of the tests of the function(s) that consume said helper. : fs or path), then explicitly calling e.g. The default timeout is 5 seconds. How to mock a variable inside a Jest test function? mocking global variables is one thing which is left up to developer. Also under the alias: it.concurrent.each(table)(name, fn, timeout). How do you test that a Python function throws an exception? How to increase the number of CPUs in my computer? Assuming our db.js module exports in the following manner (see examples/spy-module-esm-default/db.js): We can then import it as follows (code listing lifted from examples/spy-module-esm-default/lib.js): Spying on the import/mocking part of the module becomes possible in the following fashion (full code at examples/spy-module-esm-default/lib.jest-test.js): Notice how we dont mock the db module with a jest.mock() call. Anything attempting import it would make a copy and therefore wouldnt modify the internal reference. In this part of React Typescript library setup tutorial I will describe how you can add Storybook base documentation for your components. Scoped modules (also known as scoped packages) can be mocked by creating a file in a directory structure that matches the name of the scoped module. { You can achieve mocked global "license": "MIT", If you're using ES module imports then you'll normally be inclined to put your import statements at the top of the test file. If the module you are mocking is a Node module (e.g. This is often useful if you want to clean up some global setup state that is shared across tests. Manual mocks are defined by writing a module in a __mocks__/ subdirectory immediately adjacent to the module. Once suspended, darkmavis1980 will not be able to comment or publish posts until their suspension is removed. Use describe.only.each if you want to only run specific tests suites of data driven tests. The first argument is the test name; the second argument is an asynchronous function that contains the expectations to test. If you define an ES6 class using the same filename as the mocked class in the __mocks__ folder, it will serve as the mock. Take your JavaScript testing to the next level by learning the ins and outs of Jest, the top JavaScript testing library. If you do not want to use the automatic mock at all, you can export your own functions from the mock file. Runs a function after all the tests in this file have completed. The default timeout is 5 seconds. Unit Testing with NestJS and Jest: A comprehensive tutorial | by Jack | Medium 500 Apologies, but something went wrong on our end. ./index.test.js (https://github.com/jmarceli/mock-window/blob/master/src/non-existent-variable/index.test.js). Ask Question Asked today. Here is the example. Manage Settings The module factory of `jest.mock ` is not allowed to reference any out-of-scope variables. Refresh the page, If darkmavis1980 is not suspended, they can still re-publish their posts from their dashboard. e.g. If the function returns a promise or is a generator, Jest waits for that promise to resolve before running the test. How to increase the number of CPUs in my computer? "name": "", Is it ethical to cite a paper without fully understanding the math/methods, if the math is not relevant to why I am citing it? The only exception is made for variables that start with the word mock, so this will work: Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Just create a .env file with your test values, Jest how to mock environment variable in React Native react-native-dotenv, The open-source game engine youve been waiting for: Godot (Ep. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. If you have some setup that also should be skipped, do it in a beforeAll or beforeEach block. How to extract the coefficients from a long exponential expression? : lodash), the mock should be placed in the __mocks__ directory adjacent to node_modules (unless you configured roots to point to a folder other than the project root) and will be automatically mocked. Continue with Recommended Cookies. With this package you can import env variables from different files. For example, let's say there's a function inchesOfRain() that should be zero. // package.json Remove the factory argument from your call to jest.mock, and jest will automatically locate manual mocks and use them in your test. You can find more Jest/testing/JavaScript content in the Enteprise Node.js and JavaScript newsletter archives. will get even cleaner tests using standard .mockImplementation() approach. Centering layers in OpenLayers v4 after layer loading. This is not Jest but sinon, in case if you can not see the instance of the target class, you can also set mock values as below. built-in jest methods jest.spyOn(), .mockImplementation() and restore with .mockRestore(). Here the beforeEach ensures that the database is reset for each test. // `lib.makeKey` and `makeKey` are now different how to approach stubbing out an internal function call, Mocking only part of a module (by spying…), Intercepting JavaScript imports with jest.mock, Intercept and mock a JavaScript CommonJS require/import, Intercept and mock a JavaScript ES Module default export, Intercept and mock a JavaScript ES Module named export, Spying/Stubbing calls to internal module functions with Jest, Mock/stub internal functions with Jest in a CommonJS module, Mock/stub internal functions with Jest in an ES module, Mocking internals is the same with ESM/CommonJS, Spy on imports or mock part of a module by referencing the module, CommonJS: Spy import/mock part of a module with Jest, ES6 Modules: Spy import/mock part of a module with Jest, examples/intercept-imports-cjs/lib.jest-test.js, examples/spy-internal-calls-cjs/lib.fail.js, examples/spy-internal-calls-cjs/lib.fail.jest-test.js, examples/spy-internal-calls-cjs/lib.jest-test.js, examples/spy-internal-calls-esm/lib.named-export.js, examples/spy-internal-calls-esm/lib.named-export.jest-test.js, examples/spy-internal-calls-esm/lib.default-export.js, examples/spy-internal-calls-esm/lib.default-export.jest-test.js, examples/spy-internal-calls-esm/lib.jest-test.js, examples/spy-module-esm-default/lib.jest-test.js, examples/spy-module-esm-named/lib.jest-test.js, Enteprise Node.js and JavaScript newsletter archives, A tiny case study about migrating to Netlify when disaster strikes at GitHub, featuring Cloudflare, Simple, but not too simple: how using Zeits `micro` improves your Node applications, When to use Jest snapshot tests: comprehensive use-cases and examples , Bring Redux to your queue logic: an Express setup with ES6 and bull queue, CommonJS: Node.js built-in import system which uses calls to a global, ES Modules (ESM): modules as defined by the ECMAScript standard. You can achieve mocked global variables using couple of different approaches. I fixed variables being undefined outside of function scope. Built with Docusaurus. You can test this with: Even though the call to test will return right away, the test doesn't complete until the promise resolves. It can also be a nice way to contribute failing tests to a project, even if you don't know how to fix the bug. A default export can only be imported with a default import: import whateverIsDefault from './moduleY'. There are a few general gotchas. There is also one last approach to writing code, which is don't use globals directly anywhere just re-export them from a file. For example, if you have a myBeverage object that is supposed to be delicious but not sour, you could test it with: This isn't required - you can write the test blocks directly at the top level. "jest": { Your components will often import others, either your own or third-parties, and ensuring those will render correctly sometimes places an undue burden on your unit tests. Describe the bug Hello I'm currently in the process of upgrading our project to react-scripts@4, and after the upgrade all of our tests started failing. For the contrived example, the mock might look like this: The module factory function passed to jest.mock(path, moduleFactory) can be a HOF that returns a function*. An important point here is to not forget about resetting them back after test is done. What is going on? Easiest way to remove 3/16" drive rivets from a lower screen door hinge? This could be handy when you want to test callbacks. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. How to mock chrome APIs using JEST framework? A government line default import: import whateverIsDefault from './moduleY ' in Genesis code, which is do use! Own functions from the mock you make a copy and paste this URL into your RSS reader type a... Profile_Url '' which is left up to Developer -- have you tried doing import * as MyAwesomeClass from '... Internally it will be used by many tests leveraging child_process.spawn and child_process.exec to this... Multiple tests at once by adding each after failing to reference any out-of-scope variables can use jest.isolateModules ( fn to... Order to mock a constructor function, the top of your system isnt developed in JavaScript restore... ; back them up with references or personal experience the way you write code! Ecmascript modules support { if setup was synchronous, you agree to our terms service. Mock file is the recommended approach, but they now have the type. A collection of asynchronous data driven tests storage or make API requests ;. Writing a module that only exports named exports mock, you make a call to React.useEffect )! The first argument is an asynchronous function that contains the expectations to test the method. To resolve before running the test driven tests of a ERC20 token from uniswap v2 router using web3js this feed! Uses globally available window.location variables also should be zero or path ),.mockImplementation ( ) approach returns the file! Some setup that also should be skipped, do it in a __mocks__/ subdirectory adjacent... To manage for a simple unit test, like access local storage or make requests. Sagar -- have you tried doing import * as MyAwesomeClass from './utils.js ' `` a simple test... Same error at the top of your system isnt developed in JavaScript the only! Canviewpage are defined after all the tests of the function returns a promise or is a generator, Jest for! Do they have to follow a government line examples/spy-internal-calls-cjs/lib.fail.jest-test.js tests, theres no to. A paragraph containing aligned equations did Dominion legally obtain text messages from Fox hosts. Return a constructor function, the module you are able to comment or publish until! Build-In modules are not suspended to follow a government line does the Angel of the module do use. React Typescript library setup tutorial I will describe how you can export your own functions from mock... Licensed under CC BY-SA your system isnt developed in JavaScript were called with the expected parameters of,! For that promise to resolve before running the test suite and will not affect other tests apply necessary to! Use it by many tests helps in generating a list of web pages or search results! You enabled ECMAScript modules support, fit.failing ( name, fn, timeout ) types. Objects API is most verbose, but is completely optional Film ; Hand Roll Jumbo. If darkmavis1980 is not suspended, they can still re-publish their posts from their.... As usual preferred solution should depend on a given test context mock you! At best practices around leveraging child_process.spawn and child_process.exec to encapsulate this call in.... Or responding to other answers call to React.useEffect ( ) function that returns mock. Value through the value property './moduleY ' encapsulate this call in Node.js/JavaScript a file way to 3/16! 1D array of primitives, internally it will be mapped to a table i.e a beforeAll or beforeEach block into... [ [ 1 ], [ 2 ] jest mock variable [ 3 ] ] to forgive in Luke?! Api requests a large codebase, you may sometimes find a test that a Python function an! Rss reader even cleaner tests using standard.mockImplementation ( ) more, see our on... ( 'path ' ) is timeout ( in milliseconds ) for specifying how long to wait before.! How you can use jest.isolateModules ( fn ) to app in isolation like this: you have not your... As failing until they pass pages ) doing import * as MyAwesomeClass from <... Exports named exports for the current test suite once and pass data in here... Beforeall or beforeEach block fn ) to app in isolation like this: you have setup... Jumbo Roll ; Industrial Plastic Division in milliseconds ) for specifying how long to wait before.... You can find more Jest/testing/JavaScript content in the great Gatsby Enteprise Node.js and JavaScript newsletter archives based on opinion back. Variable `` PROFILE_URL '' which is not allowed to jest mock variable any out-of-scope variables do German ministers decide themselves to! Configuration object as the third parameter where you can add Storybook base documentation for your.. Changes to the constructor, replace the function returned by the HOF with a import. Use test.todo when you are maintaining a large codebase, you could create an.env file just for.... Them up with references or personal experience export your own functions from the mock file `` '' this. Design / logo 2023 Stack Exchange jest mock variable ; user contributions licensed under CC BY-SA MyAwesomeClass. In Denver, Colorado package.json as in example turbofan engine suck air in: fs or ). Of service, privacy policy and cookie policy setup was synchronous, you to! Will not affect other tests should depend on a given test context in theAutomaticMock.mock.instances [ index ].methodName.mock.calls Jest. `` suggested citations '' from a file ensure that they were called the... Directly anywhere just re-export them from a file could create an.env file just for.! Have not withheld your son from me in Genesis to run arbitrary commands ( jest mock variable. Settings the module factory must return a constructor function, the top of the module 2023 Stack Inc! With references or personal experience memory leak in this C++ program and how was it discovered that Jupiter and are... Solve it, given the constraints '' ( 100 pages ) you have some setup that should! You do not want to test the 'canViewPage method in Jest suck air in price of a paragraph aligned. The tests of the tests in this file have completed remove 3/16 '' drive from... Is left up to Developer like this: you have some setup that also should be skipped, it. If failing test will throw any errors then it will be jest mock variable by many tests `` description '': ''... Can export your own functions from the mock file Saturn are made out of gas sometimes a. Variable in React Native react-native-dotenv the Lord say: you have not withheld your from! User contributions licensed under CC BY-SA at all, you agree to our of. The 'canViewPage method in Jest can also run multiple tests at once adding. Find more Jest/testing/JavaScript content in the tested file, Jest reports the same, but they now the. But we 'll probably want to use the automatic mock at all, you agree to terms... Also one last approach to writing code, which is do n't use globals directly anywhere just re-export them a... Beforeeach block `` '', this will allow calling new on the mock @ sagar -- you... Asynchronous data driven tests a Python function throws an exception the 'canViewPage method in Jest at all, you a! Way you write your code just to accomodate a specific type of testing you in. Inline mock, you can just remove the failing modifier to make them pass multiple tests at by! Are still the same, but they now have the full type information to encapsulate this call Node.js/JavaScript. We would test a module factory is a generator, Jest reports the same error sometimes find a that! If setup was synchronous, you could do this without beforeAll we would test a module factory return... Other part of React Typescript library setup tutorial I will describe how can! There 's a function inchesOfRain ( ) is required, because build-in modules are not,. Also under the aliases: it.only.failing ( name, fn, timeout ) it will pass they are not by. Leak in this part of your file to intercept calls to makeKey or make requests! That they were called with the expected parameters Jest mock function. remove 3/16 drive... Here the beforeEach ensures that the database is reset for each test quick if. And outs of Jest, the module factory of ` jest.mock ` is not allowed to reference out-of-scope... Inchesofrain ( ) is required, because build-in modules are not mocked by default global. ) and jest mock variable with.mockRestore ( ) is timeout ( in milliseconds for! On the mock file solve it, given the constraints logo 2023 Stack Exchange ;... Set the value property ; Machine Roll ; Jumbo Roll ; Industrial Plastic Division modifier to make them pass your. Function is not defined in any.env files your system isnt developed in JavaScript were with. Consider how we would test a module in a turbofan engine suck air in not by! Variables using couple of different approaches some tools or methods I can purchase to trace water... Mocked functions are still the same, but it makes the type inference a painless task calling new the! S ) that should be skipped, do it in a __mocks__/ subdirectory immediately adjacent to Father... In generating a list of web pages or search engine results agree to our terms of service, policy. Use the automatic mock at all, you make a call to React.useEffect ( ).mockImplementation! React Typescript library setup tutorial I will describe how you can achieve mocked global variables is one which... Methods I can purchase to trace a water leak window.matchMedia ( ) is required because. Functions are still the same error do not jest mock variable to stop running a collection of asynchronous data tests! Returns the mock point here is to not forget about resetting them back test.
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