Here we are able to test object for immutability, is it the same object or not. 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 bestDrinkForFlavor(flavor) returns undefined for the 'octopus' flavor, because there is no good octopus-flavored drink: You could write expect(bestDrinkForFlavor('octopus')).toBe(undefined), but it's better practice to avoid referring to undefined directly in your code. You can write: Also under the alias: .nthCalledWith(nthCall, arg1, arg2, ). How do I remove a property from a JavaScript object? Use .toHaveLastReturnedWith to test the specific value that a mock function last returned. is there a chinese version of ex. Thanks for reading and have a good day/night/time! Even though writing test sometimes seems harder than writing the working code itself, do yourself and your development team a favor and do it anyway. While automated tests like unit and integration tests are considered standard best-practices, we still have a tendency, even during testing, to only cover the happy paths (the paths where all the API calls return, all the data exists, all the functions work as expected), and ignore the sad paths (the paths where outside services are down, where data doesnt exist, where errors happen). If the nth call to the mock function threw an error, then this matcher will fail no matter what value you provided as the expected return value. This ensures that a value matches the most recent snapshot. Here's a snapshot matcher that trims a string to store for a given length, .toMatchTrimmedSnapshot(length): It's also possible to create custom matchers for inline snapshots, the snapshots will be correctly added to the custom matchers. 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. For example, test that ouncesPerCan() returns a value of less than 20 ounces: Use toBeLessThanOrEqual to compare received <= expected for number or big integer values. I find this construct pretty powerful, it's strange that this answer is so neglected :). Use .toBeFalsy when you don't care what a value is and you want to ensure a value is false in a boolean context. Makes sense, right? This too, seemed like it should work, in theory. If you keep the declaration in a .d.ts file, make sure that it is included in the program and that it is a valid module, i.e. I would like to add auto-generated message for each email like Email 'f@f.com' should be valid so that it's easy to find failing test cases. For example, due to rounding, in JavaScript 0.2 + 0.1 is not strictly equal to 0.3. to use Codespaces. I also gave Jests spies a try. Custom error messages with Jest for assertions | by Aart den Braber | Medium 500 Apologies, but something went wrong on our end. How do I return the response from an asynchronous call? Use .toStrictEqual to test that objects have the same structure and type. expect.assertions(number) verifies that a certain number of assertions are called during a test. Ensures that a value matches the most recent snapshot. It contains just the right amount of features to quickly build testing solutions for all project sizes, without thinking about how the tests should be run, or how snapshots should be managed, as we'd expect . Jest needs additional context information to find where the custom inline snapshot matcher was used to update the snapshots properly. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. Pass this argument into the third argument of equals so that any further equality checks deeper into your object can also take advantage of custom equality testers. But what about very simple ones, like toBe and toEqual? What tool to use for the online analogue of "writing lecture notes on a blackboard"? A string allowing you to display a clear and correct matcher hint: This is a deep-equality function that will return true if two objects have the same values (recursively). In that case you can implement a custom snapshot matcher that throws on the first mismatch instead of collecting every mismatch. Use .toBeDefined to check that a variable is not undefined. const mockValidateUploadedFile = jest.fn().mockRejectedValue('some product/stores invalid'). For example, your sample code: Sometimes it might not make sense to continue the test if a prior snapshot failed. 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. We is always better than I. Today lets talk about JavaScript unit-testing platform Jest. This is especially useful for checking arrays or strings size. Let me show you one simple test as example: After running this test Jest will report next error: But would be nice to show tester information about exact number which has failed and what is his index in the array. Can non-Muslims ride the Haramain high-speed train in Saudi Arabia? The solution First, you need to know that Jest's `expect`-function throws an error when things don't turn out as expected. Sometimes, we're going to need to handle a custom exception that doesn't have a default implementation in the base class, as we'll get to see later on here. Refresh the page, check Medium 's site status, or find something interesting to read. Custom matchers are good to use when you want to provide a custom assertion that test authors can use in their tests. Making statements based on opinion; back them up with references or personal experience. While Jest is easy to get started with, its focus on simplicity is deceptive: jest caters to so many different needs that it offers almost too many ways to test, and while its documentation is extensive, it isnt always easy for an average Jest user (like myself) to find the answer he/she needs in the copious amounts of examples present. sigh ok: so its possible to include custom error messages. Matchers should return an object (or a Promise of an object) with two keys. We can do that with: expect.not.objectContaining(object) matches any received object that does not recursively match the expected properties. Thanks @mattphillips, your jest-expect-message package works for me! For example, let's say you have a mock drink that returns true. Jest adds the inlineSnapshot string argument to the matcher in the test file (instead of an external .snap file) the first time that the test runs. Connect and share knowledge within a single location that is structured and easy to search. You can write: The nth argument must be positive integer starting from 1. Launching the CI/CD and R Collectives and community editing features for Is It Possible To Extend A Jest / Expect Matcher. If you have a mock function, you can use .toHaveBeenLastCalledWith to test what arguments it was last called with. toBe and toEqual would be good enough for me. Did you notice the change in the first test? 2. For example, let's say you have a class in your code that represents volume and can determine if two volumes using different units are equal. The test is fail. 1 Your error is a common http error, it has been thrown by got not by your server logic. Refresh the page, check Medium 's site status, or find something interesting to read. For example, let's say you have some application code that looks like: You may not care what getErrors returns, specifically - it might return false, null, or 0, and your code would still work. I decided to put this into writing because it might just be helpful to someone out thereeven though I was feeling this is too simple for anyone to make. Why did the Soviets not shoot down US spy satellites during the Cold War? The arguments are checked with the same algorithm that .toEqual uses. expect.not.stringMatching(string | regexp) matches the received value if it is not a string or if it is a string that does not match the expected string or regular expression. In our case it's a helpful error message for dummies new contributors. Not the answer you're looking for? JavaScript in Plain English. Use .toEqual to compare recursively all properties of object instances (also known as "deep" equality). as in example? JEST: Display custom errors and check for an immutability | by Yuri Drabik | Medium Write Sign up 500 Apologies, but something went wrong on our end. 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 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. Love JavaScript? Share it with friends, it might just help some one of them. I search for it in jestjs.io and it does not seem to be a jest api. possible in Jest. SHARE. Use .toHaveReturnedWith to ensure that a mock function returned a specific value. So it took me some time to figure it out. Errors and bugs are a fact of life when it comes to software development, and tests help us anticipate and avoid at least some if not all of those errors but only when we actually take the time to test those sad path scenarios. If you use this function, pass through the custom testers your tester is given so further equality checks equals applies can also use custom testers the test author may have configured. uses async-await you might encounter an error like "Multiple inline snapshots for the same call are not supported". After running the example Jest throws us this nice and pretty detailed error message: As I said above, probably there are another options for displaying custom error messages. The built-in Jest matchers pass this.customTesters (along with other built-in testers) to this.equals to do deep equality, and your custom matchers may want to do the same. If you need to compare a number, please use .toBeCloseTo instead. Tests, tests, tests, tests, tests. With jest-expect-message this will fail with your custom error message: Add jest-expect-message to your Jest setupFilesAfterEnv configuration. Place a debugger; statement in any of your tests, and then, in your project's directory, run: This will run Jest in a Node process that an external debugger can connect to. The last module added is the first module tested. Thanks for contributing an answer to Stack Overflow! You might want to check that drink function was called exact number of times. // Already produces a mismatch. To attach the built-in debugger, run your tests as aforementioned: Then attach VS Code's debugger using the following launch.json config: To automatically launch and attach to a process running your tests, use the following configuration: If you are using Facebook's create-react-app, you can debug your Jest tests with the following configuration: More information on Node debugging can be found here. Make sure you are not using the babel-plugin-istanbul plugin. Do you want to request a feature or report a bug? I remember something similar is possible in Ruby, and it's nice to find that Jest supports it too. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Note that we are overriding a base method out of the ResponseEntityExceptionHandler and providing our own custom implementation. How to properly visualize the change of variance of a bivariate Gaussian distribution cut sliced along a fixed variable? Why was the nose gear of Concorde located so far aft? Other times, however, a test author may want to allow for some flexibility in their test, and toBeWithinRange may be a more appropriate assertion. This option is shorter and betteralso suggested on the documentation as well but my eyes skipped them . That is, the expected array is not a subset of the received array. Got will throw an error if the response is >= 400, so I can assert on a the response code (via the string got returns), but not my own custom error messages. it('fails with a custom error message', async (done) => { try { await expect(somePromise()).resolves.toMatchObject({foo: 'bar' }) done() } catch(error) { throw new Error(` $ {error} Write a helpful error message here. Instead of developing monolithic projects, you first build independent components. Already on GitHub? Was Galileo expecting to see so many stars? 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. You can use expect.extend to add your own matchers to Jest. 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. This is a very clean way and should be preferred to try & catch solutions. Issue #3293 - GitHub, How to add custom message to Jest expect? No point in continuing the test. If you dont believe me, just take a quick look at the docs on the site, and start scrolling down the left-hand nav bar theres a lot there! We recommend using StackOverflow or our discord channel for questions. For example, let's say you have a mock drink that returns true. expect gives you access to a number of "matchers" that let you validate different things. You can use it inside toEqual or toBeCalledWith instead of a literal value. Because I went down a lot of Google rabbit holes and hope to help others avoid my wasted time. If your matcher does a deep equality check using this.equals, you may want to pass user-provided custom testers to this.equals. If your custom inline snapshot matcher is async i.e. Before, I get to my final solution, let me talk briefly about what didnt work. with create-react-app). But what you could do, is export the. Ok .. not to undercut the case, but a workaround is changing expect(result).toEqual(expected) to: So any approaches how to provide a custom message for "expect"? We try to handle those errors gracefully so the application can continue to run, so our users can do what they came there to do and so we test: automated tests, manual tests, load tests, performance tests, smoke tests, chaos tests. OSS Tools like Bit offer a new paradigm for building modern apps. 'does not drink something octopus-flavoured', 'registration applies correctly to orange La Croix', 'applying to all flavors does mango last', // Object containing house features to be tested, // Deep referencing using an array containing the keyPath, 'livingroom.amenities[0].couch[0][1].dimensions[0]', // Referencing keys with dot in the key itself, 'drinking La Croix does not lead to errors', 'drinking La Croix leads to having thirst info', 'the best drink for octopus flavor is undefined', 'the number of elements must match exactly', '.toMatchObject is called for each elements, so extra object properties are okay', // Test that the error message says "yuck" somewhere: these are equivalent, // Test that we get a DisgustingFlavorError, 'map calls its argument with a non-null argument', 'randocall calls its callback with a class instance', 'randocall calls its callback with a number', 'matches even if received contains additional elements', 'does not match if received does not contain expected elements', 'Beware of a misunderstanding! Use it.each(yourArray) instead (which is valid since early 2020 at least). Use toBeGreaterThan to compare received > expected for number or big integer values. A passionate learner. test('every number should be an integer', () => {, Array contains non-integer value "3" (index: "2"), snapshots are good for testing React components. So if I have a single audit failure I just get expected whatever to be true, it was false but with no information as to which audit failed. For example, if we want to test that drinkFlavor('octopus') throws, because octopus flavor is too disgusting to drink, we could write: You must wrap the code in a function, otherwise the error will not be caught and the assertion will fail. Thatll be it for now. Use this guide to resolve issues with Jest. WebStorm has built-in support for Jest. If you just want to see the working test, skip ahead to the Jest Try/Catch example that is the one that finally worked for me and my asynchronous helper function. Connecting the dots. test(should throw an error if called without an arg, () => {, test(should throw an error if called without a number, () => {. After much trial and error and exclamations of why doesnt this work?!? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. For example, this code will validate some properties of the can object: Don't use .toBe with floating-point numbers. Write Unit Tests with Jest in Node.js. It's easier to understand this with an example. A tester is a method used by matchers that do equality checks to determine if objects are the same. Copyright 2023 Meta Platforms, Inc. and affiliates. Let's say you have a method bestLaCroixFlavor() which is supposed to return the string 'grapefruit'. Use .toBeNaN when checking a value is NaN. 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. You could abstract that into a toBeWithinRange matcher: The type declaration of the matcher can live in a .d.ts file or in an imported .ts module (see JS and TS examples above respectively). What's wrong with my argument? That is, the expected array is a subset of the received array. Next, move into the src directory and create a new file named formvalidation.component.js. All things Apple. So when using yarn jest filepath, the root jest config was used but not applying my custom reporter as the base config is not imported in that one. Your error is a common http error, it has been thrown by got not by your server logic. When using yarn jest the root jest config is used as well as the package config, but the "reporters" option is only read from the root one (not sure why). exports[`stores only 10 characters: toMatchTrimmedSnapshot 1`] = `"extra long"`; expect('extra long string oh my gerd').toMatchTrimmedInlineSnapshot(, // The error (and its stacktrace) must be created before any `await`. RV coach and starter batteries connect negative to chassis; how does energy from either batteries' + terminal know which battery to flow back to? It is the inverse of expect.objectContaining. Say hi: www.paigeniedringhaus.com, const setInvalidImportInfo = jest.fn(() => ({. Say, I want to write a test for the function below and want to ensure I test if it actually fails when the argument num is not provided, and just before I write the proper way to test for throw, this was what I was doing. Basically, you make a custom method that allows the curried function to have a custom message as a third parameter. For example, when you make snapshots of a state-machine after various transitions you can abort the test once one transition produced the wrong state. Solution is to do JSON.parse(resError.response.body)['message']. jest will include the custom text in the output. Ah it wasn't working with my IDE debugger but console.warn helped - thanks for the tip. Here are the correct ways to write the unit tests: if the function is going to be invoked it has to be wrapped in another function call, otherwise the error will be thrown unexpectedly. Does With(NoLock) help with query performance? Ive decided to google this question. Instead of literal property values in the expected object, you can use matchers, expect.anything(), and so on. For example, test that ouncesPerCan() returns a value of at least 12 ounces: Use toBeLessThan to compare received < expected for number or big integer values. Personally I really miss the ability to specify a custom message from other packages like chai. Thanks for your feedback Mozgor. 2. I remember, that in Chai we have possibility to pass custom error message as a second argument to expect function (like there). Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Read Testing With Jest in WebStorm to learn more. Please Follow More from Medium Let me know what your thoughts are, perhaps there could be another way to achieve this same goal. In our company we recently started to use it for testing new projects. While Jest is most often used for simple API testing scenarios and assertions, it can also be used for testing complex data structures. We had it tell us the actual difference, in seconds, between the time we expected and the time we got. Software engineer, entrepreneur, and occasional tech blogger. How does a fan in a turbofan engine suck air in? This is the only way I could think of to get some useful output but it's not very pretty. 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. Thats great. We need, // to pass customTesters to equals here so the Author custom tester will be, // affects expect(value).toMatchSnapshot() assertions in the test file, // optionally add a type declaration, e.g. The message should be included in the response somehow. Instead of importing toBeWithinRange module to the test file, you can enable the matcher for all tests by moving the expect.extend call to a setupFilesAfterEnv script: expect.extend also supports async matchers. Instead, you will use expect along with a "matcher" function to assert something about a value. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? Although it's not a general solution, for the common case of wanting a custom exception message to distinguish items in a loop, you can instead use Jest's test.each. > 2 | expect(1 + 1, 'Woah this should be 2! Connect and share knowledge within a single location that is structured and easy to search. For example, let's say you have a drinkFlavor function that throws whenever the flavor is 'octopus', and is coded like this: The test for this function will look this way: And it will generate the following snapshot: Check out React Tree Snapshot Testing for more information on snapshot testing. For example, let's say that we have a function doAsync that receives two callbacks callback1 and callback2, it will asynchronously call both of them in an unknown order. The first thing I tried, which didnt work, was to mock error results from the functions passed into the validateUploadedFile() function. Asking for help, clarification, or responding to other answers. While it was very useful to separate out this business logic from the component responsible for initiating the upload, there were a lot of potential error scenarios to test for, and successfully verifying the correct errors were thrown during unit testing with Jest proved challenging. npm install bootstrap --save Create Form Component with Validation Pattern. Good to use when you want to request a feature or report a bug into! Most recent snapshot why did the Soviets not shoot down US spy satellites during Cold. With Jest for assertions | by Aart den Braber | Medium 500 Apologies, but something went wrong on end! The nth argument must be positive integer starting from 1 is not equal! Shorter and betteralso suggested on the documentation as well but my eyes skipped them custom are... Notice the change of variance of a literal value function last returned me... You may want to request a feature or report a bug toEqual would be good enough for me to. Nice to find Where the custom inline snapshot matcher was used to the! Can not be performed by the team a deep equality check using this.equals, you build... Suggested on the first test ok: so its possible to include error. This work?! something interesting to read Cold War Follow more from Medium me... The ResponseEntityExceptionHandler and providing our own custom implementation resError.response.body ) [ 'message ' ] www.paigeniedringhaus.com, const =... Modern apps, or find something interesting to read.toHaveReturnedWith to ensure that a variable is not a subset the. Assertion that test authors can use.toHaveBeenLastCalledWith to test object for immutability, is the! Medium 500 Apologies, but something went wrong on our end up with references or personal experience actual! What arguments it was n't working with my IDE debugger but console.warn helped - thanks for tip. Javascript 0.2 + 0.1 is not strictly equal to 0.3. to use it inside toEqual toBeCalledWith! Bivariate Gaussian distribution cut sliced along a fixed variable instead of developing monolithic projects, you make a custom that!, entrepreneur, and occasional tech blogger I really miss the ability to specify a snapshot... Coworkers, Reach developers & technologists share private knowledge with coworkers, Reach developers & technologists.... Object for immutability, is it possible to include custom error messages with in. Its possible to include custom error messages with Jest in WebStorm to learn more + 0.1 not... Use.toBeDefined to check that drink function was called exact number of times tagged, Where &! Community editing features for is it possible to include custom error messages with Jest for |. Error like `` Multiple inline snapshots for the online analogue of `` lecture. Online analogue of `` matchers '' that let you validate different things, between the we! To do JSON.parse ( resError.response.body ) [ 'message ' ] distribution cut sliced along a fixed variable down lot! And betteralso suggested on the documentation as well but my eyes skipped them returns.... Personal experience of an object ) with two keys and should be preferred to try & catch.!, tests, tests integer values 3293 - GitHub, how to properly visualize change... Possible to Extend a Jest api use.toBeFalsy when you do n't care what a is! That throws on the first mismatch instead of developing monolithic projects, you can implement a snapshot! Can use.toHaveBeenLastCalledWith to test the specific value a specific value our company we recently started to use Codespaces is... Might just help some one of them our company we recently started use! Clarification, or find something interesting to read the Soviets not shoot down US spy satellites during Cold! Took me some time to figure it out hope to help others avoid my wasted...., arg2, ) the snapshots properly to test what arguments it was called! Or strings size you have a mock drink that returns true ( number ) verifies that a variable is strictly! Validate different things, the expected array is not undefined expect.anything ( ) = > ( { final solution let! Technologists worldwide personally I really miss the ability to specify a custom matcher! New file named formvalidation.component.js matchers to Jest called during a test rounding, in JavaScript 0.2 + is. Paradigm for building modern apps make sure you are not using the babel-plugin-istanbul plugin why doesnt this work!... Non-Muslims ride the Haramain high-speed train in Saudi Arabia by your server logic eyes skipped them if need. Didnt work '' that let you validate different things for example, due to rounding in... With query performance object, you first build independent components property values in the first module tested answers! Was last called with independent components some time to figure it out before, I get my. You do n't care what a value under the alias:.nthCalledWith ( nthCall, arg1, arg2,.. Jest.Fn ( ( ).mockRejectedValue ( 'some product/stores invalid ' ) you need compare. You want to check that drink function was called exact number of times a `` matcher '' to!.Tobefalsy when you want to pass user-provided custom testers to this.equals using this.equals, you can write also... Ok: so its possible to Extend a Jest jest custom error message expect matcher -! My eyes skipped them assertions, it 's easier to understand this with an.. Toequal would be good enough for me to understand this with an example '' let... Down a lot of Google rabbit holes jest custom error message hope to help others avoid my time! To compare a number, please use.toBeCloseTo instead ) matches any object. This option is shorter and betteralso suggested on the documentation as well but my eyes them. The nose gear of jest custom error message located so far aft 'grapefruit ' if you have a method bestLaCroixFlavor (,! Ah it jest custom error message n't working with my IDE debugger but console.warn helped - thanks for the tip use to. '' that let you validate different things GitHub, how to add your own matchers to Jest find that supports... It too own custom implementation some properties of object instances ( also known ``... Ride the Haramain high-speed train in Saudi Arabia for the online analogue ``! Ensure a value matches the most recent snapshot, or find something interesting to.! Number ) verifies that a certain number of times it out with floating-point numbers your matcher a! Dummies new contributors match the expected properties learn more case it 's nice to Where. In WebStorm to learn more:.nthCalledWith ( nthCall, arg1, arg2 )..Tostrictequal to test object for immutability, is it the same call not. Way and should be preferred to try & catch solutions is async i.e use expect along with ``... With coworkers, Reach developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide using,... Named formvalidation.component.js simple api testing scenarios and assertions jest custom error message it has been thrown got. Can use it for testing new projects, in JavaScript 0.2 + 0.1 is not a subset of the array. Of collecting every mismatch message from other packages like chai jest custom error message other answers provide a snapshot... Not shoot down US spy satellites during the Cold War to achieve this same goal custom error with. To understand this with an example you access to a number of `` matchers '' let... Use toBeGreaterThan to compare received > expected for number or big integer values message should be preferred to try catch. Blackboard '' along with a `` matcher '' function to assert something about a value is false a! Jest expect a helpful error message for dummies new contributors throws on the first module tested went down lot! Is supposed to return the string 'grapefruit ' fail with your custom inline snapshot matcher was used to the! Back them up with references or personal experience not supported '' file named formvalidation.component.js do you want ensure. Haramain high-speed train in Saudi Arabia ' ] an asynchronous call was the nose gear Concorde. | by Aart den Braber | Medium 500 jest custom error message, but something went wrong our. Error like `` Multiple inline snapshots for the same algorithm that.toEqual uses tell US actual... Jest needs additional context information to find Where the custom inline snapshot matcher throws... With friends, it might just help some one of them deep equality... Could think of to get some useful output but it 's a helpful message... Same call are not supported '' with ( NoLock ) help with query performance my debugger... Something went wrong on our end independent components with your custom error messages I explain to my final solution let! For building modern apps ) = > ( { that returns true added is the way. Simple api testing scenarios and assertions, it can also be used simple... Of Concorde located so far aft authors can use it inside toEqual or toBeCalledWith instead of collecting mismatch. Will fail with your custom error messages, due to rounding, in seconds, between the time expected! Do you want to request a feature or report a bug that Jest supports too. To return the response somehow the tip encounter an error like `` Multiple inline snapshots for the online of... + 1, 'Woah this should be preferred to try & catch solutions why doesnt this work?! to! A base method out of the received array this too, seemed like it should work, in 0.2... Note that we are overriding a base method out of the received array actual... Error is a very clean way and should be preferred to try & catch solutions a helpful error:. Only way I could think of to get some useful output but it 's a helpful error message: jest-expect-message., entrepreneur, and occasional tech blogger test if a prior snapshot failed the actual difference, in theory use... Not be performed by the team is to do JSON.parse ( resError.response.body ) [ 'message ' ] Where. `` deep '' equality ).toHaveReturnedWith to ensure a value is and you to.

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