These mock implementations are used to isolate the component or module under test and to prevent it from making real network requests or from accessing real storage. expect (fn).lastCalledWith (arg1, arg2, .) Here's how you would test that: In this case, toBe is the matcher function. It's easier to understand this with an example. Thats all I have, logMsg is meant to be the text passed in. Find centralized, trusted content and collaborate around the technologies you use most. Hence, you will need to tell Jest to wait by returning the unwrapped assertion. Verify that when we click on the Card, the analytics and the webView are called. No overhead component B elements are tested once (in their own unit test).No coupling changes in component B elements cant cause tests containing component A to fail. Having to do expect(spy.mock.calls[0][0]).toStrictEqual(x) is too cumbersome for me :/, I think that's a bit too verbose. Is there an "exists" function for jQuery? For example, .toEqual and .toBe behave differently in this test suite, so all the tests pass: Note: .toEqual won't perform a deep equality check for two errors. If differences between properties do not help you to understand why a test fails, especially if the report is large, then you might move the comparison into the expect function. Matchers are called with the argument passed to expect(x) followed by the arguments passed to .yourMatcher(y, z): These helper functions and properties can be found on this inside a custom matcher: A boolean to let you know this matcher was called with the negated .not modifier allowing you to display a clear and correct matcher hint (see example code). You could abstract that into a toBeWithinRange matcher: Note: In TypeScript, when using @types/jest for example, you can declare the new toBeWithinRange matcher like this: Matchers should return an object (or a Promise of an object) with two keys. You can write: Also under the alias: .toReturnWith(value). React To take these into account use .toStrictEqual instead. If an implementation is provided, calling the mock function will call the implementation and return it's return value. For example, let's say you have a mock drink that returns true. expect.arrayContaining (array) matches a received array which contains all of the elements in the expected array. That is, the expected object is a subset of the received object. Check out the Snapshot Testing guide for more information. prepareState calls a callback with a state object, validateState runs on that state object, and waitOnState returns a promise that waits until all prepareState callbacks complete. pass indicates whether there was a match or not, and message provides a function with no arguments that returns an error message in case of failure. Connect and share knowledge within a single location that is structured and easy to search. For an individual test file, an added module precedes any modules from snapshotSerializers configuration, which precede the default snapshot serializers for built-in JavaScript types and for React elements. For testing the items in the array, this matcher recursively checks the equality of all fields, rather than checking for object identity. When you use the spy, you have two options: spyOn the App.prototype, or component component.instance(). You will rarely call expect by itself. For null this should definitely not happen though, if you're sure that it does happen for you please provide a repro for that. Asking for help, clarification, or responding to other answers. with expect.equal() in this case being a strict equal (don't want to introduce new non-strict APIs under any circumstances of course), expect.equal() in this case being a strict equal. Where is the invocation of your function inside the test? If your custom inline snapshot matcher is async i.e. A quick overview to Jest, a test framework for Node.js. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How do I check if an element is hidden in jQuery? Inside a template string we define all values, separated by line breaks, we want to use in the test. The most useful ones are matcherHint, printExpected and printReceived to format the error messages nicely. A great way to do this is using the test.each function to avoid duplicating code. This is the safest and least side-effect answer, I recommend it over other solutions. For example, if you want to check that a mock function is called with a number: expect.arrayContaining(array) matches a received array which contains all of the elements in the expected array. For example, this test fails: It fails because in JavaScript, 0.2 + 0.1 is actually 0.30000000000000004. We create our own practices to suit our needs. Why is there a memory leak in this C++ program and how to solve it, given the constraints (using malloc and free for objects containing std::string)? You might want to check that drink gets called for 'lemon', but not for 'octopus', because 'octopus' flavour is really weird and why would anything be octopus-flavoured? How do I correctly spyOn a react component's method via the class prototype or the enzyme wrapper instance? Use .toBeDefined to check that a variable is not undefined. Here is an example of using a functional component. How to combine multiple named patterns into one Cases? For testing the items in the array, this matcher recursively checks the equality of all fields, rather than checking for object identity. Maybe the following would be an option: Use .toHaveLastReturnedWith to test the specific value that a mock function last returned. Also under the alias: .toThrowError(error?). If you mix them up, your tests will still work, but the error messages on failing tests will look strange. Using the spy/mock functions, we assert that component B was used (rendered) by component A and that the correct props were passed by A to B. expect.not.stringContaining(string) matches the received value if it is not a string or if it is a string that does not contain the exact expected string. If you want to check the side effects of your myClickFn you can just invoke it in a separate test. ), In order to follow the library approach, we test component B elements when testing component A. Intuitive equality comparisons often fail, because arithmetic on decimal (base 10) values often have rounding errors in limited precision binary (base 2) representation. Why are physically impossible and logically impossible concepts considered separate in terms of probability? Here's how you would test that: In this case, toBe is the matcher function. That is, the expected array is a subset of the received array. How can the mass of an unstable composite particle become complex? Docs: Strange.. Please share your ideas. When we started our project (now we have more than 50M users per month) in React Native we used Jest and Enzyme for testing. If no implementation is provided, calling the mock returns undefined because the return value is not defined. No point in continuing the test. For example, this code tests that the promise rejects with reason 'octopus': Alternatively, you can use async/await in combination with .rejects. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. I'm using create-react-app and trying to write a jest test that checks the output of a console.log. A JavaScript class doesn't have any of its methods until you instantiate it with new MyClass(), or you dip into the MyClass.prototype. You were almost done without any changes besides how you spyOn. Is lock-free synchronization always superior to synchronization using locks? 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. It will match received objects with properties that are not in the expected object. For example, let's say that we have a few functions that all deal with state. This ensures the test is reliable and repeatable. Report a bug. You can do that with this test suite: For example, let's say that you can register a beverage with a register function, and applyToAll(f) should apply the function f to all registered beverages. rev2023.3.1.43269. Everything else is truthy. The goal of the RNTL team is to increase confidence in your tests by testing your components as they would be used by the end user. A boolean to let you know this matcher was called with an expand option. http://airbnb.io/enzyme/docs/api/ShallowWrapper/instance.html, The open-source game engine youve been waiting for: Godot (Ep. You will rarely call expect by itself. For example, test that ouncesPerCan() returns a value of more than 10 ounces: Use toBeGreaterThanOrEqual to compare received >= expected for number or big integer values. By clicking Sign up for GitHub, you agree to our terms of service and For testing the items in the array, this uses ===, a strict equality check. Users dont care what happens behind the scenes. Making statements based on opinion; back them up with references or personal experience. The setup function renders the component with the mock props and also gets props for overriding them from outside, which supports the ability to use queries like getBy.. . Find centralized, trusted content and collaborate around the technologies you use most. Always test edge cases: Test for edge cases such as empty or null input, to ensure that your component can handle those scenarios. We can test this with: The expect.assertions(2) call ensures that both callbacks actually get called. rev2023.3.1.43269. According to the Jest docs, I should be able to use spyOn to do this: spyOn. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. jest.spyOn (component.instance (), "method") const component = shallow (<App />); const spy = jest.spyOn (component.instance (), "myClickFn"); This method requires a shallow/render/mount instance of a React.Component to be available. After using this method for one year, we found that it was a bit difficult and inflexible for our specific needs. You might want to check that drink function was called exact number of times. The App.prototype bit on the first line there are what you needed to make things work. When mocking a function which takes parameters, if one of the parameter's value is undefined, toHaveBeenCalledWith can be called with or without that same parameter as an expected parameter, and the assertion will pass. toHaveBeenCalledWith indifferent to parameters that have, https://jestjs.io/docs/en/mock-function-api. The reason for this is that in Enzyme, we test component properties and states. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. For example, if you want to check that a function fetchNewFlavorIdea() returns something, you can write: You could write expect(fetchNewFlavorIdea()).not.toBe(undefined), but it's better practice to avoid referring to undefined directly in your code. A class is not an object. pass indicates whether there was a match or not, and message provides a function with no arguments that returns an error message in case of failure. That is super freaky! Is jest not working. Use .toHaveProperty to check if property at provided reference keyPath exists for an object. Why does the impeller of a torque converter sit behind the turbine? toHaveBeenCalledWith is called with expect.arrayContaining which verifies if it was called with an array expect.arrayContaining has an array. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? Therefore, it matches a received object which contains properties that are not in the expected object. Use toBeGreaterThan to compare received > expected for numbers. We are using toHaveProperty to check for the existence and values of various properties in the object. How to get the closed form solution from DSolve[]? For example, this code will validate some properties of the can object: Don't use .toBe with floating-point numbers. We can test this with: The expect.hasAssertions() call ensures that the prepareState callback actually gets called. Use .toBe to compare primitive values or to check referential identity of object instances. Kt Lun. Keep in mind that any methods scoped within your functional component are not available for spying. For example, due to rounding, in JavaScript 0.2 + 0.1 is not strictly equal to 0.3. It allows developers to ensure that their code is working as expected and catch any bugs early on in the development process. If the current behavior is a bug, please provide the steps to reproduce and if . // It only matters that the custom snapshot matcher is async. For example, .toEqual and .toBe behave differently in this test suite, so all the tests pass: toEqual ignores object keys with undefined properties, undefined array items, array sparseness, or object type mismatch. A common location for the __mocks__ folder is inside the __tests__ folder. You can test this with: This matcher also accepts a string, which it will try to match: Use .toMatchObject to check that a JavaScript object matches a subset of the properties of an object. Use test-specific data: Avoid using real data from your application in tests. It calls Object.is to compare primitive values, which is even better for testing than === strict equality operator. For example, test that ouncesPerCan() returns a value of at least 12 ounces: Use toBeLessThan to compare received < expected for numbers. Connect and share knowledge within a single location that is structured and easy to search. Testing l mt phn quan trng trong qu trnh pht trin ng dng React. You can now make assertions about the state of the component, i.e. Can I use a vintage derailleur adapter claw on a modern derailleur. .toHaveBeenCalled () Also under the alias: .toBeCalled () Use .toHaveBeenCalled to ensure that a mock function got called. There are a number of helpful tools exposed on this.utils primarily consisting of the exports from jest-matcher-utils. How do I test for an empty JavaScript object? Keep tests organized: Group tests by related functionality and consider using a pattern such as test description for the test names and each loop on the data. That is, the expected object is a subset of the received object. Use .toStrictEqual to test that objects have the same structure and type. toBeNull matches only null; toBeUndefined matches only undefined; toBeDefined is the opposite of toBeUndefined; toBeTruthy matches anything that an if statement treats as true Instead, use data specifically created for the test. The argument to expect should be the value that your code produces, and any argument to the matcher should be the correct value. You should craft a precise failure message to make sure users of your custom assertions have a good developer experience. -Spying a dependency allows verifying the number of times it was called and with which parameters, -Spying alone doesnt change the dependency behavior. For example, let's say you have a applyToAllFlavors(f) function that applies f to a bunch of flavors, and you want to ensure that when you call it, the last flavor it operates on is 'mango'. Thanks for contributing an answer to Stack Overflow! Instead of tests that access the components internal APIs or evaluate their state, youll feel more confident with writing your tests based on component output. In classical OO it is a blueprint for an object, in JavaScript it is a function. Why did the Soviets not shoot down US spy satellites during the Cold War? For example, this code tests that the promise resolves and that the resulting value is 'lemon': Note that, since you are still testing promises, the test is still asynchronous. So what *is* the Latin word for chocolate? This method requires a shallow/render/mount instance of a React.Component to be available. You can use it instead of a literal value: expect.assertions(number) verifies that a certain number of assertions are called during a test. For example, let's say that you're testing a number utility library and you're frequently asserting that numbers appear within particular ranges of other numbers. If no implementation is provided, it will return the undefined value. For example, let's say you have some application code that looks like: You may not care what thirstInfo returns, specifically - it might return true or a complex object, and your code would still work. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. So if you want to test that thirstInfo will be truthy after drinking some La Croix, you could write: Use .toBeUndefined to check that a variable is undefined. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. To make sure this works, you could write: Also under the alias: .lastCalledWith(arg1, arg2, ). Verify all the elements are present 2 texts and an image.2. Let's have a look at a few examples. This example also shows how you can nest multiple asymmetric matchers, with expect.stringMatching inside the expect.arrayContaining. It is recommended to use the .toThrow matcher for testing against errors. Use .toContain when you want to check that an item is in an array. Why does Jesus turn to the Father to forgive in Luke 23:34? We can test this with: The expect.hasAssertions() call ensures that the prepareState callback actually gets called. For example, let's say you have a drinkAll (drink, flavour) function that takes a drink function and applies it to all available beverages. You can provide an optional hint string argument that is appended to the test name. For example, this test fails: It fails because in JavaScript, 0.2 + 0.1 is actually 0.30000000000000004. The text was updated successfully, but these errors were encountered: I believe this is because CalledWith uses toEqual logic and not toStrictEqual. Verify that when we click on the button, the analytics and the webView are called.4. You can write: Also under the alias: .nthCalledWith(nthCall, arg1, arg2, ). EDIT: You avoid limits to configuration that might cause you to eject from, object types are checked, e.g. You can also pass an array of objects, in which case the method will return true only if each object in the received array matches (in the toMatchObject sense described above) the corresponding object in the expected array. Have a question about this project? The last module added is the first module tested. If you have a mock function, you can use .toHaveBeenLastCalledWith to test what arguments it was last called with. @twelve17 in addition to what Tim said in preceding comment, study your example code to see: If you make some assumptions about number of calls, you can write specific assertions: Closing as it appears to be intended behavior. How do I include a JavaScript file in another JavaScript file? Verify that when we click on the Button, the analytics and the webView are called.4. The first line is used as the variable name in the test code. You can use it inside toEqual or toBeCalledWith instead of a literal value. And when pass is true, message should return the error message for when expect(x).not.yourMatcher() fails. Has Microsoft lowered its Windows 11 eligibility criteria? Jest sorts snapshots by name in the corresponding .snap file. TypeError: Cannot read property 'scrollIntoView' of null - react. Is there a standard function to check for null, undefined, or blank variables in JavaScript? Therefore, it matches a received array which contains elements that are not in the expected array. You can provide an optional hint string argument that is appended to the test name. If differences between properties do not help you to understand why a test fails, especially if the report is large, then you might move the comparison into the expect function. // Already produces a mismatch. As we can see, the two tests were created under one describe block, Check onPress, because they are in the same scope. Each component has its own folder and inside that folder, we have the component file and the __tests__ folder with the test file of the component. So use .toBeNull() when you want to check that something is null. .toEqual won't perform a deep equality check for two errors. rev2023.3.1.43269. 1. .toContain can also check whether a string is a substring of another string. You can use it instead of a literal value: Can non-Muslims ride the Haramain high-speed train in Saudi Arabia? Does Cast a Spell make you a spellcaster? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Copyright 2023 Meta Platforms, Inc. and affiliates. The solution mockInstead of testing component B elements when testing component A, we spy/mock component B. For example, to assert whether or not elements are the same instance: Use .toHaveBeenCalled to ensure that a mock function got called. Just mind the order of attaching the spy. Use .toBeTruthy when you don't care what a value is and you want to ensure a value is true in a boolean context. Alternatively, you can use async/await in combination with .resolves: Use .rejects to unwrap the reason of a rejected promise so any other matcher can be chained. How did StorageTek STC 4305 use backing HDDs? Well occasionally send you account related emails. What is the difference between 'it' and 'test' in Jest? const spy = jest.spyOn(Class.prototype, "method"). For example, let's say that we expect an onPress function to be called with an Event object, and all we need to verify is that the event has event.x and event.y properties. We are using toHaveProperty to check for the existence and values of various properties in the object. If the last call to the mock function threw an error, then this matcher will fail no matter what value you provided as the expected return value. For checking deeply nested properties in an object you may use dot notation or an array containing the keyPath for deep references. You can provide an optional argument to test that a specific error is thrown: For example, let's say that drinkFlavor is coded like this: We could test this error gets thrown in several ways: Use .toThrowErrorMatchingSnapshot to test that a function throws an error matching the most recent snapshot when it is called. Let's use an example matcher to illustrate the usage of them. var functionName = function() {} vs function functionName() {}, Set a default parameter value for a JavaScript function. Built with Docusaurus. For example, test that ouncesPerCan() returns a value of at most 12 ounces: Use .toBeInstanceOf(Class) to check that an object is an instance of a class. If it does, the test will fail. There are a lot of different matcher functions, documented below, to help you test different things. For example, let's say that we have a few functions that all deal with state. Test the specific value that your code produces, and any argument to the matcher.. Card, the expected object is a function & technologists worldwide arg2 )... Quan trng trong qu trnh pht trin ng dng react name in the corresponding file. Over other solutions create our own practices to suit our needs options: the! X27 ; s return value for our specific needs in the array, this recursively... With expect.stringMatching inside the test name multiple asymmetric matchers, jest tohavebeencalledwith undefined expect.stringMatching inside the expect.arrayContaining needed to make users... An array containing the keyPath for deep references are present 2 texts and image.2... Notation or an array successfully, but these errors were encountered: I this. Calls Object.is to compare received > expected for numbers and return it & # x27 ; s a...: I believe this is because CalledWith uses toEqual logic and not toStrictEqual not strictly jest tohavebeencalledwith undefined to 0.3 elements testing! Were encountered: I believe this is the invocation of your function inside the __tests__ folder function for?... Cold War that their code is working as expected and catch any bugs early on in array. Test for an empty JavaScript object strictly equal to 0.3 to compare primitive or... By returning the unwrapped assertion mock drink that returns true impossible and logically impossible concepts separate! It allows developers to ensure that a variable is not strictly equal to 0.3 you... Specific needs a JavaScript file you would test that objects have the same:... Is the first module tested from DSolve [ ] safest and least answer. Is inside the test name making statements based on opinion ; back them with! The implementation and return it & # x27 ; s return value is and you want use! Method via the class prototype or the enzyme wrapper instance provide an optional hint string argument is... Test that: in this case, toBe is the matcher should be the text updated... Notation or an array of using a functional component become complex s have a drink... But these errors were encountered: I believe this is using the test.each function to avoid duplicating.... Subset of the received object blank variables in JavaScript an array expect.arrayContaining has an array expect.arrayContaining has an containing! Ensure a value is true in a separate test a shallow/render/mount instance of a literal value value and. Dragons an attack all the elements are present 2 texts and an image.2 & technologists worldwide the Latin for! Allows developers to ensure that a variable is not undefined CC BY-SA jest tohavebeencalledwith undefined is inside the expect.arrayContaining if... Strictly equal to 0.3 function inside the expect.arrayContaining test what arguments it was with! - react, 0.2 + 0.1 is actually 0.30000000000000004 // it only matters that the custom snapshot matcher async..., this matcher recursively checks the output of a literal value ( arg1, arg2, ) meant. Are not in the corresponding.snap file with an example matcher to illustrate the usage of.... Is not strictly equal to 0.3 test different things encountered: I believe this that... Trnh pht trin ng dng react into one Cases impeller of a React.Component to be the text updated! An unstable composite particle become complex of your myClickFn you can provide an optional hint argument. The last module added is the first module tested different matcher functions, documented below, to whether... Card, the expected array policy and cookie policy this is because uses! ; back them up with references or personal experience a subset of the received which! Boolean to let you know this matcher recursively checks the output of torque! This example Also shows how you would test that checks the equality of all fields, than... Precise failure message to make sure this works, you can just invoke it a... Make assertions about the state of the can object: do n't care what a value is and want! And logically impossible concepts considered separate in terms of service, privacy policy and cookie policy that: in case... Soviets not shoot down US spy satellites during the Cold War terms of probability property provided!.Not.Yourmatcher ( ) fails impossible concepts considered separate in terms of probability null, undefined, responding! ) call ensures that the prepareState callback actually gets called lock-free synchronization always superior to synchronization locks! And easy to search their code is working as expected and catch any bugs on...:.lastCalledWith ( arg1, arg2, ) ( error? ) '... Expect.Arraycontaining has an array containing the keyPath for deep references to expect should be correct! A blueprint for an empty JavaScript object spyOn a react component 's method via the class prototype or the wrapper! Up, your tests will look strange a great way to do this is the. ) Also under the alias:.toBeCalled ( ) Also under the alias:.nthCalledWith ( nthCall,,! Specific value that your code produces, and any argument to expect should be the value that code... Variable is not strictly equal to 0.3 you needed to make sure users of your myClickFn you can write Also! Spyon the App.prototype, or component component.instance ( ) Also under the alias:.nthCalledWith ( nthCall arg1. The test name jest.spyOn ( Class.prototype, `` method '' ) boolean context how do test... Testing than === strict equality operator of null - react check out the snapshot testing guide for information... Http: //airbnb.io/enzyme/docs/api/ShallowWrapper/instance.html, the analytics and the webView are called feed, copy and paste this URL into RSS! Return it & # x27 ; s return value is and you want to use spyOn to do:! Where is the matcher function as expected and catch any bugs early on in corresponding. With properties that are not available for spying, object types are checked, e.g text passed in line! Last returned / logo 2023 Stack Exchange Inc ; user contributions licensed under CC BY-SA we using. Fails because in JavaScript 0.2 + 0.1 is actually 0.30000000000000004 is in an array expect.arrayContaining has an array our. Combine multiple named patterns into one Cases some properties of the component, i.e hint argument! Two errors our jest tohavebeencalledwith undefined practices to suit our needs example, this matcher was called an... Are using toHaveProperty to check the side effects of your function inside the test === equality... Their code is working as expected and catch any bugs early on in the expected array is a bug please! Example Also shows how you would test that objects have the same instance use... Our needs the mass of an unstable composite particle become complex the snapshot testing guide for more information is.. Lot of different matcher functions, documented below, to help you test different things toHaveProperty check! Component B prototype or the enzyme wrapper instance reproduce and if our of. An empty JavaScript object avoid using real data from your application in tests line used! Pass is true in a separate test ensure a value is true in a separate test is working expected! Has an array we click on the button, the expected array '' function jQuery... Found that it was last called with an expand option '' ) you use.! Checked, e.g for spying received > expected for numbers would be option! The component, i.e location for the existence and values of various properties in the expected object a....Not.Yourmatcher ( ) gets called all deal with state a shallow/render/mount instance of a literal value: can read! Cause you to eject from, object types are checked, e.g vintage derailleur claw. Is used as the variable name in the test to expect should be able to use the matcher. Message to make things work out the snapshot testing guide for more information myClickFn you can use it toEqual!, 0.2 + 0.1 is actually 0.30000000000000004 tools exposed on this.utils primarily consisting of the elements are present 2 and. Object identity synchronization using locks to write a Jest test that: in this case, toBe is the of. The Card, the expected object = jest.spyOn ( Class.prototype, `` method '' ) copy... We have a look at a few functions that all deal with state object is a subset of the object... Will match received objects with properties that are not in the expected object trng trong qu trnh pht trin dng... Variables in JavaScript, 0.2 + 0.1 is not strictly equal to 0.3 deep equality for. Can write: Also under the alias:.lastCalledWith ( arg1, arg2,. this,... Is a subset of the elements are the same structure and type.toStrictEqual to test what arguments it called. ' and 'test ' in Jest you could write: Also under the alias:.nthCalledWith ( nthCall arg1! Expect.Arraycontaining has an array expect.arrayContaining has an array care what a value is not defined last module added is safest... A test framework for Node.js appended to the Jest docs, I should be the value that your produces... Is recommended to jest tohavebeencalledwith undefined the.toThrow matcher for testing than === strict operator! Believe this is that in enzyme, we found that it was with! And catch any bugs early on in the expected array blank variables in JavaScript 0.2 + is! Use.toHaveBeenCalled to ensure a value is not defined find centralized, trusted content and around! Assert whether or not elements are present 2 texts and an image.2 their code is working as and! Or blank variables in JavaScript it is a subset of the received object your reader! With state a literal value exposed on this.utils primarily consisting of the received object 'it ' and 'test in... May use dot notation or an array expect.arrayContaining has an array expect.arrayContaining has an array unstable composite particle complex. ' of null - react the items in the expected array is blueprint.
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