Sometimes, we want to fix the "Received: serializes to the same string" error with Jest and JavaScript. Here is the test for a react custom hook: I tried the shallow copy trick that @pedrottimark suggested but it didn't work (same error). on How to fix the Received: serializes to the same string error with Jest and JavaScript? Just had this problem when tried to compare arrays where in one array there was an element with -1 index set (imagine any other key to be set except numbers from 0 to N). It is because Jest probably doesn't resolve nested array automatically in that case. Yea it's strange, reproducible code wise, it's literally just comparing that structure I posted above. To learn more, see our tips on writing great answers. Is it possible to create a concave light? How to show that an expression of a finite type must be one of the finitely many possible values? Sign in Thank you for trying to help me troubleshoot this! Well occasionally send you account related emails. This worked for me after hours of agony. Check out our interactive course to master JavaScript in less time. SolveForum.com may not be responsible for the answers or solutions given to any question asked by the users. 129 E 18th St
The objects had functions defined and was the reason toMatchObject failed. So you may have this error in the following scenario: They both serialized to the same string, but they are not equal. Jest says this about. I worked around the issue by mocking them: For toMatchObject to work as expected it was important to use the same jest mock on both objects. In jest for some reason you get something like, this seems to only occur when using mongoose with jest, but I think the issue has to do with uriEncoding and decoding, If you're testing the response from a request then try, This may also work but sometimes has issues because of JSON string parsing, If you're only comparing the result of a document versus an object or output from an aggregation then try. But, sadly: My problem was that we'd put a static property on our array, which is similar to this, @AVC Are you sure that's correct? privacy statement. All Rights Reserved. As such, I am using .toMatchObject() and cannot use something else like .toEqual(). I may compare array length, but the information is restricted to a simple number instead the error key diff. Well occasionally send you account related emails. The Actual Purpose of the Bottom Number in Time Signatures [duplicate]. There are several ways to get around this. By clicking Sign up for GitHub, you agree to our terms of service and Before (causing the test to fail with "Received: serializes to the same string" on object equality checking"). Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? expect ( function (array2)). How do I make the first letter of a string uppercase in JavaScript? For example, you might have one of the following in your test case: expect([]).toBe([]) // Using an object expect({}).toBe({}) Test throwing "serializes to the same string" error Lost Mines/Icespire Peak Combo Campaign Milestone/XP Hybrid, Does this look resonable? I had a similar case where the object had a base64 encoded string, I managed the test to compare the serialization of the object using JSON.stringify: Just had this problem when tried to compare arrays where in one array there was an element with -1 index set (imagine any other key to be set except numbers from 0 to N). In my use case this behavior is a good thing because I need to make sure the objects are actually the same all the way through. sql server When its necessary to check @@trancount > 0 in try catch block? Changing it to toEqual solved the problem. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. I had this problem when i tried to compare arrays where one array was coming back from the Graphqls resolver and the other one was from my tests input. Web Test throwing serializes to the same string error Copied to clipboard. Do not hesitate to share your thoughts here to help others. How to troubleshoot crashes detected by Google Play Store for Flutter app, Cupertino DateTime picker interfering with scroll behaviour. Share Follow answered Jul 27, 2019 at 8:21 Maksim Nesterenko 5,441 11 52 89 1 My problem was that we'd put a static property on our array, which is similar to this To fix the "Received: serializes to the same string" error with Jest and JavaScript, we can use the toStrictEqual method. nealous3 Asks: clustering people according to answers on survey Hi I am finding it hard to find online the best clustering algorithm for clustering people according to answers they gave on 20 question survey. // Both of these examples will throw "erializes to the same string", Test throwing "serializes to the same string" error, Using correct matchers for checking object equality. I am also using shallow rendering and experience bad test results. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. 107 Answers Avg Quality 7/10 . Web developer specializing in React, Vue, and front end development. Why does ++[[]][+[]]+[+[]] return the string "10"? Please vote for the answer that helped you in order to help others find out which is the most helpful answer. Connect and share knowledge within a single location that is structured and easy to search. Save my name, email, and website in this browser for the next time I comment. How to print and connect to printer using flutter desktop via usb? ALL the fields were the same except the entries inside the array coming from Graphql did not have any __proto__ while the ones from my test input had __proto__: Object and that cause the toStrictEqual to fail, because it checks the types besides the structure. @patran So I can understand the problem in toMatchObject if your test gets an array of objects from MongoDB with mongoose, can you add console.log() for original array and first object: Paste the results after editing to delete properties that are not added by mongoose. Received: serializes to the same string. JavaScript : Jest.js error: \"Received: serializes to the same string\" \r[ Gift : Animated Search Engine : https://bit.ly/AnimSearch ] \r \rJavaScript : Jest.js error: \"Received: serializes to the same string\" \r\rNote: The information provided in this video is as it is with no modifications.\rThanks to many people who made this project happen. then I know right away that I must use .toEqual() instead of .toBe() A very simple message that can so so helpful. Do not hesitate to share your response here to help other visitors like you. Contributed on Mar 09 2022 . comparison is correct (although unexpected) that () => {} or jest.fn () as expected value are not referentially equal to (that is, not the same instance as) the function returned by the hook rev2023.3.3.43278. And as arrow functions create different instances for all the objects in contrast to normal function which have only one instance class-wide, the arrow function comparison results false. What does this exception even mean? Maybe additional configuration for Jest? Some of our partners may process your data as a part of their legitimate business interest without asking for consent. 20202023 Webtips. Tags: javascript string. Removing the circular dependency resolved the issue. Similarly to other colleagues I had this issue with an Array comparison, I was basically testing a function that got the largest string in an array, additionally it should return an array if more than 1 of those strings matched the largest length possible. For both these use cases, a default serialization is provided. I have the same issue. I run into the "serializes to the same string" issue when using toMatchObject. Thank you! If you can't convert to normal function you can use JSON.stringify() to convert them first to strings and then use toEqual() or toBe(). To overcome the problem, I used. You are not alone. In my case I was comparing the array of objects (basically a model class). I finally found a workaround using jest-extended with the toContainAllKeys method: However, having a strict-less built-in object comparison method would be a nice addition. Below is an example of a serialized and deserialized Person object using JSON.stringify and JSON.parse respectively. Manage Settings Theoretically Correct vs Practical Notation. received: serializes to the same string Lyxigt Ltt Hallon Efterrtt, Mary Ann Phelan Cause Of Death, rrbildning Efter Konisering, Richard Osman Iq, Pressad Citron P Flaska Motsvarar, Will There Be The 2nd Part 2, Keanu Reeves Foundation Contact, Vtuner Alternative Denon, , Mary Ann Phelan Cause Of Death, rrbildning Efter Konisering, Jest.js error: "Received: serializes to the same string", How Intuit democratizes AI development across teams through reusability. So a simple solution would be to convert your arrow functions to normal functions in classes. Questions labeled as solved may be solved or may not be solved depending on the type of question and the date posted for some posts may be scheduled to be deleted periodically. How to Fix the 'SyntaxError: unterminated string literal' Error in Our JavaScript App? How to check whether a string contains a substring in JavaScript? To Reproduce. That "received" kind of sounds like the test did pass, because what it received serialized to the same string that the expected value serializes to. However, I'm still confused: all examples should result in the same behavior. Have a question about this project? Maybe this will help somebody else. So, in my case the type caused to fail. @Mause. Jest.js error: "Received: serializes to the same string" javascript unit-testing jestjs Similarly to other colleagues I had this issue with an Array comparison, I was basically testing a function that got the largest string in an array, additionally it should return an array if more than 1 of those strings matched the largest length possible. Thanks for contributing an answer to Stack Overflow! I had this error after introducing a circular dependency while writing tests. Your email address will not be published. Your email address will not be published. JEST and ES6 import - root folder based imports does not working, JestJS - Trying to Mock Async Await in Node JS Tests. But, sadly: Similarly to other colleagues I had this issue with an Array comparison, I was basically testing a function that got the largest string in an array, additionally it should return an array if more than 1 of those strings matched the largest length possible. I got a similar issue, stemming from a row returned by sqlite3. Connect and share knowledge within a single location that is structured and easy to search. Have a question about this project? Required fields are marked *. Mock.mockImplementation is not a function, Difference between unmock and dontMock in Jest, Jest.js error: "Received: serializes to the same string". Quite annoying that we have to look for a workaround every time we need to compare deep nested objects, object methods, etc. expect(a).toEqual(b) throws "serializes to the same string" Please, read the following article. Received: serializes to the same string 10 | ['a'] 11 | ) > 12 | ).toBe({ | ^ 13 | a: 'A', 14 | }); 15 | }); at Object.<anonymous> (src/lib/object.spec.js:12:5) If you console.log the result of the pick call, you would see {a: 'A'}. (if you read the old version of this question where I was getting passing tests that I didnt understand, it was because I was returning from the loop when I should have been continueing). expected "test" received serializes to the same string. This is my workaround: @manhhailua Thank you so much! ALL the fields were the same except the entries inside the array coming from Graphql did not have any __proto__ while the ones from my test input had __proto__: Object and that cause the toStrictEqual to fail, because it checks the types besides the structure. In my situation, I was deep equal checking a proxied object vs a regular object. Thank you, solveforum. How do I replace all occurrences of a string in JavaScript? Alternative. Jest"Received: serializes to the same string" FAIL collections Make dictionary read only in C#, javascript Using an authorization header with Fetch in React Native. The text was updated successfully, but these errors were encountered: @sabriele Yes, your choice of toMatchObject makes sense. "Received: serializes to the same string" on object equality checking, https://jestjs.io/docs/en/expect#expectanyconstructor, https://mongoosejs.com/docs/api.html#document_Document-toObject, https://jestjs.io/docs/en/expect#tothrowerror, 1/3 - Update scm and decoration through Repository class. How to fix Uncaught TypeError: data.push is not a function with JavaScript? In my case I was comparing the array of objects (basically a model class). , Can't think of a "symptomatic" fix for this without some kind of fix for #2549. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Variant of free logic that accepts domain emptiness but rejects non-referring terms, [Solved] How to first initialize global variable in React and then use it in other files. I've having a strange problem with this test: And I see that the problem is with functions. I had a similar case where the object had a base64 encoded string, I managed the test to compare the serialization of the object using JSON.stringify: Just had this problem when tried to compare arrays where in one array there was an element with -1 index set (imagine any other key to be set except numbers from 0 to N). Why Is PNG file with Drop Shadow in Flutter Web App Grainy? PS. My solution was to mock the module when the function resided before running the test, the mocking ensured that all the functions have the same identity. You signed in with another tab or window. How to get the last character of a string? Just showing the data structure isn't quite enough for folks to understand what code needs to be in place for the bug to surface. $5 wines and beers
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