jest mock throw error

@MGDeveloper we dont need try-catch while unit testing and using toThrow() (. Jest will throw an error, if the same test function is passed a done () callback and returns a promise. Well occasionally send you account related emails. Escape will cancel and close the window. How do you test that a Python function throws an exception? Why must a product of symmetric random variables be symmetric? This is a very verbose way of testing for exceptions when Jest already has the expect.toThrow() way of checking for exceptions: Yes, but it tests only type, not message or other content and the question was about test message, not type. But it does throw this error: Ok, updated jest to your version, now it works! Why do we kill some animals but not others? Is JavaScript a pass-by-reference or pass-by-value language? Are there conventions to indicate a new item in a list? Jest has built in functions to handle resolution or rejection of promises 1 tylervipond commented on Oct 15, 2020 I was mistaken in my earlier comment: expect (await myFetchFunction ()).toThrowError (); appears not to work (though it did initially, So I must've made a mistake elsewhere). If a law is new but its interpretation is vague, can the courts directly ask the drafters the intent and official interpretation of their law? How to handle it and make and assert? Therefore, any mock for an ES6 class must be a function or an actual ES6 class (which is, again, another function). fetchMock.mockReject(new Error('Internal Server Error')); console.log('mockedError', console.error.mock.calls); inside your test cases, you can see, that the message about missing id isn't triggered in the second test. Dot product of vector with camera's local positive x-axis? What am I missing here? How to cancel timeout inside of Javascript Promise? mockFn.mock.results An array containing the results of all calls that have been made to this mock function. Example: test ("Test description", () => { const t = () => { throw new TypeError (); }; expect (t).toThrow (TypeError); }); Or if you also want to check for error message: Find centralized, trusted content and collaborate around the technologies you use most. What's the difference between a power rail and a signal line? How did StorageTek STC 4305 use backing HDDs? Further analysis of the maintenance status of jest-mock-recorder based on released npm versions cadence, the repository activity, and other data points determined that its maintenance is Sustainable. This also directly relates to how Jest mocks will differ. To use this approach and not trigger no-conditional-expect rule (if you're using eslint-plugin-jest), documentation of this rule suggest to use error wrapper: From my (albeit limited) exposure to Jest, I have found that expect().toThrow() is suitable if you want to only test an error is thrown of a specific type: expect(() => functionUnderTest()).toThrow(TypeError); Or an error is thrown with a specific message: expect(() => functionUnderTest()).toThrow('Something bad happened! That's how we will use Jest to mock Axios. This is done as a precaution to avoid memory leaks in your tests. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. It is a little bit weird, but it works and IMHO is good readable: The Catch block catches your exception, and then you can test on your raised Error. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Suppose we want to test the following function using Node.js and assert that it indeed throws an error: func.js: const func = () => { throw new Error ('my error') } module.exports = func const userSettings = new ClientSettingsBuilder(); @swapnasundarbiswal Your code is not cover PointSvc.fetchData condition: I hit this same issue and found that the problem was with using expect.toThrow on an async function. Change .mockReturnValue with .mockImplementation: If its a promise you can also to .rejects www.jestjs.io/docs/en/asynchronous#resolvesrejectsif(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'errorsandanswers_com-medrectangle-4','ezslot_9',105,'0','0'])};__ez_fad_position('div-gpt-ad-errorsandanswers_com-medrectangle-4-0'); For promises, can use https://jestjs.io/docs/mock-function-api#mockfnmockrejectedvaluevalue, For testing that error was thrown or not, can use https://eloquentcode.com/expect-a-function-to-throw-an-exception-in-jest, Read More Avoid mutating a prop directly since the value will be overwrittenContinue, Read More What is the difference between window.console.log and console.logContinue, Read More Set-Cookie in HTTP header is ignored with AngularJSContinue, Read More Why is Jshint saying variable already defined in this if statement?Continue, Read More When to Use vm. Is there an "exists" function for jQuery? A full example of testing the type and message of an error: If functionUnderTest() does not throw an error, the assertions will be be hit, but the expect.assertions(2) will fail and the test will fail. rev2023.3.1.43269. I am unable to alter the source unfortunately, (as this was perfectly testable with mocha, chia and sinon). Asking for help, clarification, or responding to other answers. Not the answer you're looking for? resource: I'm getting the error. Thus you have to take care of restoration yourself when manually assigning jest.fn().". Hence, you will need to tell Jest to wait by returning the unwrapped assertion. How do I fit an e-hub motor axle that is too big? How are we doing? Mock error throw from functionB (). Cheers! In addition, it comes with utilities to spy, stub, and mock (asynchronous) functions. Beginning of dialog window. Making statements based on opinion; back them up with references or personal experience. You need to throw a Javascript Error object, so the Jest toThrowError method identifies that an error has been thrown. Then once you had caught the error in your test you could test the custom contents of the error. to your account. Thanks for contributing an answer to Stack Overflow! In the project root directory, make a tests folder. Thanks for contributing an answer to Stack Overflow! it expects the return value to be a Promise that is going to be resolved. Throw Error throws an error. Below is the sample code to mock the axios library. rev2023.3.1.43269. The number of distinct words in a sentence. Sort array of objects by string property value, Detecting an "invalid date" Date instance in JavaScript, How to store objects in HTML5 localStorage/sessionStorage, From an array of objects, extract value of a property as array, How to access the correct `this` inside a callback, How to test the type of a thrown exception in Jest. Why did the Soviets not shoot down US spy satellites during the Cold War? You must wrap the code in an additional function callback! @GerasimosRagavanis when you're testing an async function you should. How can I mock the JavaScript 'window' object using Jest? So if we provided a simple {} empty object, Jest would throw the following error: Cannot spy the updateOne property because it is not a function; undefined given instead Fakes, stubs, and test doubles Spy. Using this simplified example component and test, I'd expect the two tests to behave as such: I'm sure I am missing something obvious, like clearing the mock wrong or whatever. How To Wake Up at 5 A.M. Every Day. However, you could create your custom error by decorating an instance of an error object. What I personally like about this is that everything is synchronous, so you might not have to call done() when following such approach. What factors changed the Ukrainians' belief in the possibility of a full-scale invasion between Dec 2021 and Feb 2022? mock . How to derive the state of a qubit after a partial measurement? www.jestjs.io/docs/en/asynchronous#resolvesrejects, https://jestjs.io/docs/mock-function-api#mockfnmockrejectedvaluevalue, https://eloquentcode.com/expect-a-function-to-throw-an-exception-in-jest, Accident Lawyer in San Francisco California. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Unit testing is an essential aspect of software development. rev2023.3.1.43269. Write Unit Tests with Jest in Node.js. I have 2 tests (each one in a separate test suit) where I mock one function (namely, Meteors callMethod) that is used in mutations. Applications of super-mathematics to non-super mathematics. asserting against thrown error objects in jest, https://github.com/facebook/jest/issues/8140, https://github.com/DanielHreben/jest-matcher-specific-error, The open-source game engine youve been waiting for: Godot (Ep. Save my name, email, and website in this browser for the next time I comment. Hopefully that matcher can be added into Jest in the future. Does jest redefine the Error global variable? In this example we will learn how to write a simple test case using Mockito. I always forget about the expecting multiple assertions feature of Jest (possibly I just don't personally find it the most intutitive, but it definitely works for such cases!) What is the difference between describe and it in Jest? Why are physically impossible and logically impossible concepts considered separate in terms of probability? Not the answer you're looking for? We then need to create a setupJest.js file in the root of our project. Check your inbox to confirm your email address. setupJest.js global.fetch = require('jest-fetch-mock'); In it we just directly override the global.fetch function, which is what our app leverages to make remote requests. In Jest you have to pass a function into expect(function).toThrow(). How to properly make mock throw an error in Jest? While the tests pass, JSDom complains for each one. This is a known issue with JSDom but while node-canvas is still in alpha, they're not going to fix it.. What tool to use for the online analogue of "writing lecture notes on a blackboard"? The RxJS uses the try/catch block to catch any errors thrown from the observables. You should check both: the error message and its type. Story Identification: Nanomachines Building Cities. The documentation is clear on how to do this. Find centralized, trusted content and collaborate around the technologies you use most. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? If the objective is to check partial content of error, we can use Jest expect.objectContaining to help us keep code simple and check object payload returned as error : In your jest.config add the file above to your setupFilesAfterEnv list, for example: When I need to test a custom error (subclass of Error), I use the following approach: Thanks for contributing an answer to Stack Overflow! Connect and share knowledge within a single location that is structured and easy to search. Note: `jest.fn(implementation)` is a shorthand for `jest.fn().mockImplementation(implementation)`. How do I copy to the clipboard in JavaScript? Here are some common response codes: 400 Bad Request - client sent an invalid request, such as lacking required request body or parameter. Because of additional callback wrap, the code will not be run immediately, so jest will be able to catch it. How to execute a JavaScript function when I have its name as a string. Thanks for contributing an answer to Stack Overflow! This folder will store all the test files. You are not alone. Strange expect(true).toBe(false); is needed to fail your test if the expected Error will be not thrown. We can do this by simply passing the function to the expect without actually invoking it, and calling thetoThrowmethod on it with the passed error. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. .resolves / .rejects You can also use the .resolves matcher in your expect statement, and Jest will wait for that promise to resolve. Module A.spec contains the test. 4. Again, from the official docs, we read, "Creates a mock function similar to jest.fn() but also tracks calls to object[methodName]. Have a question about this project? Please help us improve AWS. How do I make the first letter of a string uppercase in JavaScript? What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? Has 90% of ice around Antarctica disappeared in less than a decade? The second test fails, complaining that the mock function was called zero times. Jest mock unnable to pick up error throw? Module A contains the method to test. In this article, we explored how to configure method calls to throw an exception in Mockito. You should always check the error message to be sure you are checking the correct throw case and not getting another error your code may throw. To set a mock date in Jest, we can use the useFakeTimers and setSysttemTime methods., Sometimes, we want to mock dependency in Jest with TypeScript. Check out our interactive course to master JavaScript in less time. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Pilates: The Celebrity-Approved Workout That Can Help You Stay Lean, Long, and Lithe! I.e. Why is Jshint saying variable already defined in this if statement? Your email address will not be published. Small detailed that you mentioned here and saved me a lot of headache: the. What is the difference between state and props in React? Would the reflected sun's radiation melt ice in LEO? Is there an option to show all test descriptions when I run jest tests? Web developer specializing in React, Vue, and front end development. The good stuff in the Jest documentation is the part on Manual Mocks. There are 2 scenario we can mock for functionB (). Pass that error instance into the mockRejectedValuemethod, similar to what we did in the example with mockResolvedValue. Is there a more recent similar source? This answer solves only 50% of the problem. Find centralized, trusted content and collaborate around the technologies you use most. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, You don't need to cache the original method. I am mocking AWS.SSM to fail. Jest Mock an an error thrown and get the actual error from the catch Ask Question Asked 1 year ago Modified 1 year ago Viewed 4k times Part of AWS Collective 0 In code below I'm trying to test method getParameter for failure. Making statements based on opinion; back them up with references or personal experience. const mockFunc = jest.fn().mockImplementation( () => return "mock func"); console.log(mockFunc()); jest.fn () mockImplemantion. 20202023 Webtips. You signed in with another tab or window. Jest has a method, toThrow(error), to test that a function throws when it is called. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. Find centralized, trusted content and collaborate around the technologies you use most. Axios is an es6 class, so mocking axios will be similar to mocking an es6 class in jest. Is variance swap long volatility of volatility? The mock itself will still record all calls that go into and instances that come from itself - the only difference is that the implementation will also be executed when the mock is called. Not the answer you're looking for? Making statements based on opinion; back them up with references or personal experience. By using mock functions, we can know the following: ES6 classes are constructor functions with some syntactic sugar. privacy statement. What can a lawyer do if the client wants him to be aquitted of everything despite serious evidence? Starter Code With Jest already installed, let's start an API function: App/util/api.js Sadly, even wrapping with a try/catch (which probably isn't the best idea anyway) doesn't work. From jest 24 documentation: "Beware that mockFn.mockRestore only works when mock was created with jest.spyOn. Asking for help, clarification, or responding to other answers. Learn how you can properly mock environment variables in your Jest tests to correctly test environment-specific parts in your application. I am trying to mock the PUT call of HttpClient of Angular to throw error. Now the error show in editor , before only on terminal ! You need to throw a Javascript Error object, so the Jest toThrowError method identifies that an error has been thrown. Incomplete \ifodd; all text was ignored after line. The number of distinct words in a sentence. Why do we kill some animals but not others? Only approach that worked was using the try catch inside the test case. If you order a special airline meal (e.g. Incomplete \ifodd; all text was ignored after line. You must wrap the code of the function that you are expecting in another arrow function, otherwise the error will not be caught and the assertion will fail. Thanks for pointing out that. Why does the impeller of a torque converter sit behind the turbine? Ackermann Function without Recursion or Stack. Unsubscribe anytime. I am using Jest. How to mock dependency in Jest with TypeScript. Let's say I have a function that takes two parameters and it will throw an error if one of them is null. Is Koestler's The Sleepwalkers still well regarded? It will not throw an error and may go unnoticed, causing undesirable behaviour. Whenever you are looking to test an error thrown by a function in Jest, you want to pass the function to the expect, rather than invoking the function. How can I mock an ES6 module import using Jest? to call callMethod.mockImplementation with a callback that throws and error. I've encoutered similar problem and here's my solution. Avoid mutating a prop directly since the value will be overwritten, What is the difference between window.console.log and console.log, Set-Cookie in HTTP header is ignored with AngularJS. How can I make an AJAX call without jQuery? I ended up writing a convenience method for our test-utils library. Launching the CI/CD and R Collectives and community editing features for JEST: Ignore tabs/spaces in expected error object. What factors changed the Ukrainians' belief in the possibility of a full-scale invasion between Dec 2021 and Feb 2022? Good one - may I ask why the anonimous function wrapper is needed? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Dot product of vector with camera's local positive x-axis? @spirosikmd I think the problem I case across is that I need to create an instance of fetch.Response with a status code, and currently it seems I need to create that with other libraries such as node-fetch on node. or this. Jest sell JavaScript, Jest Async expecttoThrow expectAsync test('throws on octopus', () => { expect( () => { drinkFlavor('octopus'); }).toThrow(); }); In Jest you have to pass a function into expect (function).toThrow (<blank or type of error>). Find centralized, trusted content and collaborate around the technologies you use most. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Truce of the burning tree -- how realistic? Can non-Muslims ride the Haramain high-speed train in Saudi Arabia? Unavoidably we will have to use a. How can I make this regulator output 2.8 V or 1.5 V? So I guess your example would look something like this: Again, I haven't test it, but I think it should work. It is also nice to check the error type, so the client code may rely on it. What are examples of software that may be seriously affected by a time jump? Applications of super-mathematics to non-super mathematics, The number of distinct words in a sentence. throwError('Message') is deprecated instead use throwError(callback). Now we are going to use Jest to test the asynchronous data fetching function. What are some tools or methods I can purchase to trace a water leak? Asking for help, clarification, or responding to other answers. We can mock the axios library using the jest.mock()function and providing a mock factory method. @rags2riches the anonymous function is required because, The snippet provided in the question is checking a property of the thrown exception. @IlmariKumpula That's why you have the first line which defines how many assertions you are expecting. Good job. rev2023.3.1.43269. Connect and share knowledge within a single location that is structured and easy to search. React We found that jest-mock-recorder demonstrates a positive version release cadence with at least one new version released in the past 12 months. I was mistaken in my earlier comment: expect(await myFetchFunction()).toThrowError(); appears not to work (though it did initially, So I must've made a mistake elsewhere). Was Galileo expecting to see so many stars? expect(() => fn()).toThrowError(new Error({})); this is not gonna work soundly, if you want to check a "complete match", since toThrow/toThrowError only ever checks the the .message property of the thrown object. Do EMC test houses typically accept copper foil in EUT? Returns a Jest mock function." What this means is that the function acts as it normally wouldhowever, all calls are being tracked. Launching the CI/CD and R Collectives and community editing features for How to mock imported named function in Jest when module is unmocked, Jest mocks bleeding between tests, reset isn't fixing it. Why must a product of symmetric random variables be symmetric? vegan) just to try it, does this inconvenience the caterers and staff? Any errors thrown from the observables that & # x27 ; s how we will use to. Wrap, the snippet provided in the possibility of a full-scale invasion between Dec 2021 and Feb 2022 motor that. //Jestjs.Io/Docs/Mock-Function-Api # mockfnmockrejectedvaluevalue, https: //eloquentcode.com/expect-a-function-to-throw-an-exception-in-jest, Accident Lawyer in San Francisco California why must product. And here 's my solution a product of symmetric random variables be symmetric only on terminal configure method to... In terms of probability error has been thrown I comment the Jest toThrowError method identifies that error... Mock was created with jest.spyOn is Jshint saying variable already defined in this article, we explored how configure! Takes two parameters and it will not throw an error and may go unnoticed, causing undesirable behaviour my! Hopefully that matcher can be added into Jest in the past 12 months the... Clear on how to derive the state of a string my manager that a he... Mock an es6 module import using Jest ) ; is needed to your! That matcher can be added into Jest in the past 12 months line defines! Using Mockito community editing features for Jest: Ignore tabs/spaces in expected error will be able catch. That matcher can be added into Jest in the jest mock throw error is checking a property of problem!, stub, and website in this example we will use Jest to test the custom contents the. `` exists '' function for jQuery a setupJest.js file in the possibility of a full-scale invasion Dec! Test case using Mockito 's the difference between a power rail and a signal line code! Variables in your expect statement, and Jest will throw an error and may go unnoticed, causing undesirable.. Accept copper foil in EUT callback wrap, the snippet provided in the past 12.! Some syntactic sugar not others take care of restoration yourself when manually jest.fn... To show all test descriptions when I run Jest tests to correctly test environment-specific parts your! Opinion ; back them up with references or personal experience I explain to my manager that a Python throws... Has been thrown directly relates to how Jest mocks will differ a product of symmetric random variables symmetric. Callback wrap, the code will not be performed by the team (... Try/Catch block to catch any errors thrown from the observables 1.5 V Jest 24 documentation ``! In Mockito Manual mocks can also use the.resolves matcher in your tests object, so the toThrowError! Custom error by decorating an instance of an error has been thrown throwerror ( 'Message ' is... To mock the JavaScript 'window ' object using Jest I copy to the clipboard in JavaScript how Wake. To Wake up at 5 A.M. Every Day mockfnmockrejectedvaluevalue, https: //jestjs.io/docs/mock-function-api # mockfnmockrejectedvaluevalue, https: #! Call of HttpClient of Angular to throw a JavaScript error object, so the client code may rely it... For a free GitHub account to open an issue and contact its maintainers and the community interactive course to JavaScript! Scenario we can know the following: es6 classes are constructor functions with some syntactic..: Ok, updated Jest to wait by returning the unwrapped assertion vector with camera 's local positive?. Help you Stay Lean, Long, and Lithe next time I comment of them is null shoot down spy! Save my name, email, and Jest will wait for that promise to resolve Manual mocks error. 2.8 V or 1.5 V IlmariKumpula that 's why you have to take care of restoration yourself when manually jest.fn... Impossible concepts considered separate in terms of probability concepts considered separate in terms probability... To tell Jest to mock the axios library using the jest.mock ( ) function and a! Object, so the Jest toThrowError method identifies that an error object, so mocking axios will not... Source unfortunately, ( as this was perfectly testable with mocha, chia and sinon ). `` can... Account to open an issue and contact its maintainers and the community your tests what we did in possibility. This error: Ok, updated Jest to mock axios property of the error in Jest does this the. Ilmarikumpula that 's why you have to pass a function throws an exception in Mockito instance... Expect statement, and Lithe matcher in your application //jestjs.io/docs/mock-function-api # mockfnmockrejectedvaluevalue,:. Clear on how to configure method calls to throw a JavaScript function when run. Type, so the client wants him to be aquitted of everything despite serious evidence props. An AJAX call without jQuery can purchase to trace a water leak has 90 of... New version released in the example with mockResolvedValue for Jest: Ignore tabs/spaces in expected error will be thrown. Error and may go unnoticed, causing undesirable behaviour the tests pass, JSDom complains each! That may be seriously affected by a time jump yourself when manually assigning jest.fn ( callback! Promise that is structured and easy to search that can help you Stay Lean,,! ( true ).toBe ( false ) ; is needed to fail your test you could your. Tests pass, JSDom complains for each one the test case difference between describe it! Of additional callback wrap, the code will not throw an error object, so mocking will. This URL into your RSS reader will differ let 's say I have a function an. Dont need try-catch while unit testing and using toThrow ( error ) to. Rail and a signal line state and props in React function callback is passed a done )! Software that may be seriously affected by a time jump an array containing the of... Convenience method for our test-utils library, JSDom complains for each one,. 'S why you have to take care of restoration yourself when manually assigning jest.fn ( implementation ) ` is shorthand. This RSS feed, copy and paste this URL into your RSS reader added into Jest in the of. Copper foil in EUT this error: Ok, updated Jest to test the asynchronous data function. The root of our project for that promise to resolve a done ( ) callback returns. Be a promise that is structured and easy to search symmetric random variables be symmetric to indicate a new in... Describe and it in Jest that an error and may go unnoticed, causing undesirable behaviour thrown... A callback that throws and error and a signal line the.resolves matcher in your expect statement, and in! Least one new version released in the possibility of a full-scale invasion between Dec 2021 Feb! All test descriptions when I run Jest tests dont need try-catch while unit testing is an class!, we can mock the PUT call of HttpClient of Angular to throw an exception your application exception! Root directory, make a tests folder do EMC test houses typically accept copper foil in EUT a! Was perfectly testable with mocha, chia and sinon ). `` I mock an class. Into the mockRejectedValuemethod, similar to what we did in the project root directory, a. Why does the impeller of a qubit after a partial measurement, toThrow error... And a signal line on how to write a simple test case HttpClient of Angular to error! That have been made to this RSS feed, copy and paste this URL into your reader. Sit behind the turbine, if the client code may rely on it writing convenience! To avoid memory jest mock throw error in your expect statement, and Lithe callMethod.mockImplementation with a callback that throws and error and. Less time why the anonimous function wrapper is needed to fail your test if the same test function passed. Issue and contact its maintainers and the community perfectly testable with mocha chia. Custom error by decorating an instance of an error has been thrown property of the problem required because, code! Or type of error > ). `` for Jest: Ignore tabs/spaces in expected error will be similar mocking... Only 50 % of ice around Antarctica disappeared in less time that matcher can be into. You Stay Lean, Long, and Lithe between Dec 2021 and Feb 2022 code. Be seriously affected by a time jump JavaScript in less time less than a?... Number of distinct words in a list 've encoutered similar problem and here my. \Ifodd ; all text was ignored after line fetching function the Jest documentation is purpose! Write a simple test case using Mockito at the base of the thrown exception of HttpClient of Angular to an... To how Jest mocks will differ around the technologies you use most into... And using toThrow ( ) callback and returns a promise that is structured and to! Just to try it, does this inconvenience the caterers and staff go unnoticed, causing undesirable behaviour syntactic.... Does the impeller of a full-scale invasion between Dec 2021 and Feb 2022 asynchronous! Execute a JavaScript function when I run Jest tests using toThrow ( ). ``, copy and this... Able to catch any errors thrown from the observables 's why you have to pass function! Results of all calls that have been made to this mock function PUT call of HttpClient Angular. 'S my solution technologies you use most to other answers your application properly make throw! Question is checking a property of the thrown exception the JavaScript 'window ' object using Jest root of our.. We explored how to do this that have been made to this mock function was zero... Which defines how many assertions you are expecting may I ask why the anonimous wrapper., Vue, and Lithe some syntactic sugar Jest tests to correctly test environment-specific parts your! Catch inside jest mock throw error test case using Mockito is needed this answer solves only 50 % of error! Satellites during the Cold War a Lawyer do if the same test function is passed a done ( ) ``!

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