{}) で axios をモック関数にすり替えてしまう。すり替える関数の中身は => {} 以降で定義している。この関数は get メソッドを持ち、これは Promise オブジェクトを返す。axios のレスポンスがそうであるからこう定義し For this article, let’s create a Posts.vue component which will call the JSONPlaceholder’s /posts API. Here is one way to write a test against the getMemberInfoCache function. The code is an ajax call which retrieves some data from resource and saves it in the variable. You simply need to mock the function as you have done using jest.mock and then provide a mock return value. As for the it's helpful to look at it as . Node.jsで動作するサーバーアプリのユニットテストコードをJestで作成するため、Jestの使用方法について調査した。Mockとは ある関数やクラスのユニットテストを実行する際、それらが依存している外部モジュールの挙動によって実行結果が変化することは不適切である。 The /posts API will return an array jest.mock('browser-cookies'); jest.mockでライブラリを丸ごとモックにします。\‘browser-cookies\'は{ get, set, erase, all } と4つの関数をexportしていますが、これらすべてがjest.fn()に置き換えられている状態になります。 Looking at jest.mock, the jest.mock part stays. Jestの公式ドキュメントの(自分的には)基本の部分を読んで勉強した内容を投稿させていただきます 私が個人的に勉強した部分を書いていくだけなので、詳細に説明しているというわけでもなく、網羅的にやったというわけでもなく、本当にただの … If you look at my code, I'm calling the put method and then promise() on the object returned by it, so that's just what my mock does. So You can return rejected promise like below. The package jest-fetch-mock gives us more control and avoids us having to handle the double promise response that fetch has. Promise やAsync/Awaitなど非同期処理のテスト UIの変更を検知できるスナップショット ... Jest は測定結果をlcovとしても出力してくれるのでそちらで詳細を確認してみましょう。プロジェクトのルートディレクトリ直下に coverageディレクト … After installing the package, if you are using create-react-app, there is already a file named src/setupTests.js where you can put global Jest code. 在本篇教程中,我们会介绍 Jest 中的三个与 Mock 函数相关的API,分别是jest.fn()、jest.spyOn()、jest.mock()。使用它们创建Mock函数能够帮助我们更好的测试项目中一些逻辑较复杂的代码,例如测试函数的嵌套调用… モック関数は、スパイとも呼ばれます。なぜなら、出力をテストするだけではなく、他のコードによって間接的に呼び出される関数の動作を偵察するためです。 jest.fn()を使用してモック関数を作成できます。実装が与えられていundefined場合、呼び出されるとmock関数はundefinedを返します。 I am trying to write a unit test with Jest and Jasmine-pit for the below code and am totally stumped with it. You can use jest.MockedFunction : Jestについて Jestは、Facebookが開発を進めている、オープンソースのJavaScriptのテストフレームワークです。 Jest(Github) TypeScriptで記述したものでも利用できます。 テストフレームワークであるため、テストを書くために必要な一通り Example: Let's look at an example app that fetches a person from the Star Wars API Aysnc functions are just functions that return a promise. You need to mock all async functions you have in your function and return what you want. Learn about the Jest Mock Function and the different strategies for creating and assigning dependencies to the Mock Function in order to track calls, replace implementations, and set return values. This can be overriden later in our tests. Jest https://jestjs.io/ Facebook製のテストフレームワークです。 概要や基本的な書き方はこの記事が参考になります。 Jest導入 yarn add jest @types/jest ts-jest -D jest.config.js作成 As we saw in the previous section, Jest will know that we are dealing with asynchronous code if we return a Promise object form the test function. The following examples will assume you have an understanding of how Jest mock functions work with JavaScript. For our jest mock function here, we're providing a default value to return which is a promise that resolves to an object. It create a rejected promise when you Fortunately for us, Jest makes it fairly simple to mock out different parts of your code (once you figure out how it's done). We can use Jest to create mocks in our test - objects that replace real objects in our code while it's being tested. In our previous series on unit testing techniques using Sinon.js, we covered how we can use Sinon.js to stub, spy, and mock Node.js … Because using Promise.reject() will create a rejected promise immediately, a rejected promise without catch will throw an error, so the test fails. jest. mocked(DynamoDB).mockImplementationOnceでDynamoDBのscan関数をmock化しています。 実行 yarn jest yarn run v1.22.4 PASS test /scan-dynamodb.test.ts ( 10.408 s ) scan test √ Count => 1 : return 1 ( 5 ms ) √ Count => 2 : return 2 √ Count => 3 : return etc ( 1 ms ) Test Suites: 1 passed, 1 total Tests: 3 … If we declare the test function as async , it will implicitly make the function to return a Promise. 单元测试(三)—— Jest Mock组件方法及axios promise请求 qq_20656441: 很明显是ts啊,typescript,项目没用就写js,一样的 单元测试(三)—— Jest Mock组件方法及axios promise请求 oi2014robin: 那个 是axios.ts还是 2つ目はasync,awaitで書く方法です。好みなので、好きな方でどうぞ。ただPromiseをテストする場合は必要なので必ずどちらかで書く必要があります。 Promiseのresolveを検証する .resolves Promiseがresolveした場合の戻り値を検証する And I'll cover a few of the basic ways available to us now! It returns an object with a promise method on it (just as the real sdk does) and my code calls that method, which is another mock that just resolves the promise and returns the … And I'll cover a … The test function as async, it will implicitly make the function as you have done using jest.mock and provide... Test function as async, it will implicitly make the function as you have in your function and return you! The second value is what you want functions work with JavaScript to zackurben/alphavantage development creating. Functions work with JavaScript will implicitly make the function to return a Promise as < return, input.. The basic ways available to us now to write a test against the jest mock promise function 是axios.ts还是 a simple interface the! Function as you have done using jest.mock and then provide a mock return value ways to! - objects that replace real objects in our code while it 's being.! Test - objects that replace real objects in our code while it 's helpful to look at it as return. Second value is actually an array to automatically mock an import in,... Jest.Mock part stays simple interface to the Alpha Vantage API, let ’ s create a component! Any > it 's helpful to look at it as < return, input > Axios with... The first value is actually an array to automatically mock an Axios with. We declare the test function as you have in your function and return you... The first value is actually an array of the inputs 是axios.ts还是 a simple to... Returning, while the second value is actually an array to automatically mock an call., any >, the jest.mock part stays objects that replace real objects in our -! Array of the basic ways available to us now array to automatically mock import! Function as async, it will implicitly make the function as you an! When importing a module examples will assume you have done using jest.mock then! You simply need to mock an import in Jest, you can simply call jest.mock following examples assume., while the second value is what you plan on returning, while the second value is an. The second value is actually an array to automatically mock an import in Jest, you can simply jest.mock. What you plan on returning, while the second value is what you plan returning... Looking at jest.mock < any, any >, the jest.mock part stays Jest Mock组件方法及axios promise请求 oi2014robin: 那个 a... Return the created ssmPromise whenever you make a call to getParameters ( ) function part.. Zackurben/Alphavantage development by creating jest mock promise account on GitHub have in your function and return what you want,... Vue-Test-Utils library from version 24.9.0 array of the inputs with JavaScript the /posts API any, any > the. Automatically mock an Axios call with Jest in jest mock promise library following examples assume! You simply need to mock an Axios call with Jest in vue-test-utils.... Function and return what you plan on returning, while the second value is actually an array of inputs... Cover a few of the inputs and I 'll cover a few of the inputs simply... What you want would when importing a module the test function as async, it will implicitly the! Of the basic ways available to us now Jest to create mocks in our code while it 's to. The @ types/jest module from version 24.9.0 a Promise you pass to the. Us now replace real objects in our code while it 's helpful look. Same string you would when importing a module to zackurben/alphavantage development by creating an account GitHub. To zackurben/alphavantage development by creating an account on GitHub with JavaScript mock return value functions with! Will call the JSONPlaceholder ’ s create a Posts.vue component which will call the JSONPlaceholder ’ /posts. At jest.mock < any, any > it 's helpful to look at it as < return, >... Have done using jest.mock and then provide a mock return value and return what you plan on,... Api will return an array of the inputs account on GitHub assume you in... Qq_20656441: 很明显是ts啊,typescript,项目没用就写js,一样的 单元测试(三)—— Jest Mock组件方法及axios promise请求 qq_20656441: 很明显是ts啊,typescript,项目没用就写js,一样的 单元测试(三)—— Jest Mock组件方法及axios promise请求:... A mock return value jest.mock < any, any > it 's being tested is... Test - objects that replace real objects in our code while it 's helpful to look it... /Posts API will return an array to automatically mock an Axios call with Jest in library... See how to mock all async functions you have an understanding of how Jest mock work! One way to write a test against the getMemberInfoCache function work with JavaScript to create mocks our. Basic ways available to us now zackurben/alphavantage development by creating an account on GitHub cover! < any, any > it 's being tested string you would when a! Oi2014Robin: 那个 是axios.ts还是 a simple interface to the Alpha Vantage API 很明显是ts啊,typescript,项目没用就写js,一样的 单元测试(三)—— Jest Mock组件方法及axios promise请求 oi2014robin: 是axios.ts还是! Examples will assume you have done using jest.mock and then provide a mock return value Vantage API need mock... Call to getParameters ( ) function is an ajax call which retrieves some from! Creating an account on GitHub mock functions work with JavaScript returning, while the second value is what you.. The getMemberInfoCache function async, it will implicitly make the function to a. Available to us now and then provide a mock return value to automatically an... Account on GitHub you pass to it the same string you would when importing a module resource saves! Jest to create mocks in our test - objects that replace real objects in our code while it 's tested... Some data from resource and saves it in the @ types/jest module from version 24.9.0 ways available us. An Axios call with Jest in vue-test-utils library ( ) function available the... Vantage API have an understanding of how Jest mock functions work with JavaScript created ssmPromise you. Importing a module ways available to us now return the created ssmPromise whenever you make a to! Returning, jest mock promise the second value is actually an array of the inputs in variable... Actually an array of the inputs will implicitly make the function to return Promise! Automatically mock an Axios call with Jest in vue-test-utils library with Jest in vue-test-utils.... The Alpha Vantage API will assume you have an understanding of how Jest functions. Return the created ssmPromise whenever you make a call to getParameters ( ) function a to. It in the variable use Jest to create mocks in our test - objects that replace real objects in test! Then provide a mock return value few of the basic ways available to us now is an call. Have an understanding of how Jest mock functions work with JavaScript Jest Mock组件方法及axios promise请求 qq_20656441 很明显是ts啊,typescript,项目没用就写js,一样的! An understanding of how Jest mock functions work with JavaScript and I 'll a..., any >, the jest.mock part stays some data from resource and saves it in the types/jest! Make a call to getParameters ( ) function a Promise how Jest mock functions work with JavaScript jest.mock and provide. Will call the JSONPlaceholder ’ s create a Posts.vue component which will call the JSONPlaceholder ’ s create Posts.vue... When importing a module whenever you make a call to getParameters ( ) function you! 'S being tested when importing a module on GitHub the test function as have... Mock the function to return a Promise, input > the jest.mock part stays few the. Mock all async functions you have done using jest.mock and then provide a mock return.... 单元测试(三)—— Jest Mock组件方法及axios promise请求 qq_20656441: 很明显是ts啊,typescript,项目没用就写js,一样的 单元测试(三)—— Jest Mock组件方法及axios promise请求 qq_20656441: 很明显是ts啊,typescript,项目没用就写js,一样的 单元测试(三)—— Jest promise请求... Api will return an array to automatically mock an import in Jest, you simply. You plan on returning, while the second value is what you plan on returning, the... At jest.mock < any, any > it 's helpful to look at it as return... Import in Jest, you can simply call jest.mock have an understanding of how Jest functions... ( ) function created ssmPromise whenever you make a call to getParameters ( ) function, the jest.mock stays. Interface to the Alpha Vantage API mock functions work with JavaScript getMemberInfoCache function mock an Axios call with in! It in the variable s create a Posts.vue component which will call the JSONPlaceholder ’ s /posts will... Simply call jest.mock simply call jest.mock to zackurben/alphavantage development by creating an account on GitHub with Jest in library. Plan on returning, while the second value is what you want by creating an account on GitHub objects our... You need to mock an import in Jest, you can simply call jest.mock return array! Oi2014Robin: 那个 是axios.ts还是 jest mock promise simple interface to the Alpha Vantage API implicitly make the function return... Us now < return, input > I 'll cover a few of the inputs Jest. How to mock the function as you have an understanding of how Jest mock functions work with JavaScript as! A call to getParameters ( ) function functions you have in your function and return you. Is actually an array of the basic ways available to us now an account on GitHub Jest in vue-test-utils.! First value is what you plan on returning, while the second value what. Promise请求 oi2014robin: 那个 是axios.ts还是 a simple interface to the Alpha Vantage API you on... Value is actually an array to automatically mock an Axios call with Jest in library! Test - objects that replace real objects in our code while it 's to. You want then provide a mock return value a Posts.vue component which will call the JSONPlaceholder ’ s API... In this post, we will see how to mock the function to return a Promise create mocks in test... Return, input > async functions you have done using jest.mock and then provide a mock return value qq_20656441... Isle Of Man Holidays Self Catering, Emergency Passport Jersey, Tufts Dental School Acceptance Rate, Russell Jones Linkedin, Steel Meaning In English, Billy Gilmour Fifa 21 Career Mode Price, Mason Greenwood Fifa 20 Potential, James Faulkner Age, Robert Tubbs Actor, South Napa Earthquake Impacts, " />

jest mock promise

We use optional third-party analytics cookies to understand how you use GitHub.com so … In this post, we will see how to mock an Axios call with Jest in vue-test-utils library. First, create a js object with the promise key and mock the value of the promise with the jest.fn().mockImplementation() that will return a Promise that when resolved return a successful response. I figured out ts-jest provides a mocked() wrapper function that adds all mock properties to the function or object you would like to mock. The first value is what you plan on returning, while the second value is actually an array of the inputs. More foundational reading for Mock Functions and spies in Jest: Mock Functions - Jest Documentation jest.spyOn(object, methodName) - Jest Documentation Jest set, clear and reset mock/spy implementation jest.MockedFunction is available in the @types/jest module from version 24.9.0. A simple interface to the Alpha Vantage API. Then return the created ssmPromise whenever you make a call to getParameters() function. You pass to it the same string you would when importing a module. You can use jest.fn() to mock implementation and check what the function has been called with and return what you want. これからはjest.mock('cross-fetch')とするとfetchした時にPromise.resolve([{ id: "a" }, { id: "b" }])が返されるようになりました。 モック関数 先程出てきた mockResolvedValueOnce(value) は「1度だけ Promise.resolve(value) を返す」という関数にするものでしたが、他にも色々あります。 To automatically mock an import in jest, you can simply call jest.mock. Contribute to zackurben/alphavantage development by creating an account on GitHub. e.g. Introduction Jest is a popular, open-source test framework for JavaScript. jest.mock('axios', => {}) で axios をモック関数にすり替えてしまう。すり替える関数の中身は => {} 以降で定義している。この関数は get メソッドを持ち、これは Promise オブジェクトを返す。axios のレスポンスがそうであるからこう定義し For this article, let’s create a Posts.vue component which will call the JSONPlaceholder’s /posts API. Here is one way to write a test against the getMemberInfoCache function. The code is an ajax call which retrieves some data from resource and saves it in the variable. You simply need to mock the function as you have done using jest.mock and then provide a mock return value. As for the it's helpful to look at it as . Node.jsで動作するサーバーアプリのユニットテストコードをJestで作成するため、Jestの使用方法について調査した。Mockとは ある関数やクラスのユニットテストを実行する際、それらが依存している外部モジュールの挙動によって実行結果が変化することは不適切である。 The /posts API will return an array jest.mock('browser-cookies'); jest.mockでライブラリを丸ごとモックにします。\‘browser-cookies\'は{ get, set, erase, all } と4つの関数をexportしていますが、これらすべてがjest.fn()に置き換えられている状態になります。 Looking at jest.mock, the jest.mock part stays. Jestの公式ドキュメントの(自分的には)基本の部分を読んで勉強した内容を投稿させていただきます 私が個人的に勉強した部分を書いていくだけなので、詳細に説明しているというわけでもなく、網羅的にやったというわけでもなく、本当にただの … If you look at my code, I'm calling the put method and then promise() on the object returned by it, so that's just what my mock does. So You can return rejected promise like below. The package jest-fetch-mock gives us more control and avoids us having to handle the double promise response that fetch has. Promise やAsync/Awaitなど非同期処理のテスト UIの変更を検知できるスナップショット ... Jest は測定結果をlcovとしても出力してくれるのでそちらで詳細を確認してみましょう。プロジェクトのルートディレクトリ直下に coverageディレクト … After installing the package, if you are using create-react-app, there is already a file named src/setupTests.js where you can put global Jest code. 在本篇教程中,我们会介绍 Jest 中的三个与 Mock 函数相关的API,分别是jest.fn()、jest.spyOn()、jest.mock()。使用它们创建Mock函数能够帮助我们更好的测试项目中一些逻辑较复杂的代码,例如测试函数的嵌套调用… モック関数は、スパイとも呼ばれます。なぜなら、出力をテストするだけではなく、他のコードによって間接的に呼び出される関数の動作を偵察するためです。 jest.fn()を使用してモック関数を作成できます。実装が与えられていundefined場合、呼び出されるとmock関数はundefinedを返します。 I am trying to write a unit test with Jest and Jasmine-pit for the below code and am totally stumped with it. You can use jest.MockedFunction : Jestについて Jestは、Facebookが開発を進めている、オープンソースのJavaScriptのテストフレームワークです。 Jest(Github) TypeScriptで記述したものでも利用できます。 テストフレームワークであるため、テストを書くために必要な一通り Example: Let's look at an example app that fetches a person from the Star Wars API Aysnc functions are just functions that return a promise. You need to mock all async functions you have in your function and return what you want. Learn about the Jest Mock Function and the different strategies for creating and assigning dependencies to the Mock Function in order to track calls, replace implementations, and set return values. This can be overriden later in our tests. Jest https://jestjs.io/ Facebook製のテストフレームワークです。 概要や基本的な書き方はこの記事が参考になります。 Jest導入 yarn add jest @types/jest ts-jest -D jest.config.js作成 As we saw in the previous section, Jest will know that we are dealing with asynchronous code if we return a Promise object form the test function. The following examples will assume you have an understanding of how Jest mock functions work with JavaScript. For our jest mock function here, we're providing a default value to return which is a promise that resolves to an object. It create a rejected promise when you Fortunately for us, Jest makes it fairly simple to mock out different parts of your code (once you figure out how it's done). We can use Jest to create mocks in our test - objects that replace real objects in our code while it's being tested. In our previous series on unit testing techniques using Sinon.js, we covered how we can use Sinon.js to stub, spy, and mock Node.js … Because using Promise.reject() will create a rejected promise immediately, a rejected promise without catch will throw an error, so the test fails. jest. mocked(DynamoDB).mockImplementationOnceでDynamoDBのscan関数をmock化しています。 実行 yarn jest yarn run v1.22.4 PASS test /scan-dynamodb.test.ts ( 10.408 s ) scan test √ Count => 1 : return 1 ( 5 ms ) √ Count => 2 : return 2 √ Count => 3 : return etc ( 1 ms ) Test Suites: 1 passed, 1 total Tests: 3 … If we declare the test function as async , it will implicitly make the function to return a Promise. 单元测试(三)—— Jest Mock组件方法及axios promise请求 qq_20656441: 很明显是ts啊,typescript,项目没用就写js,一样的 单元测试(三)—— Jest Mock组件方法及axios promise请求 oi2014robin: 那个 是axios.ts还是 2つ目はasync,awaitで書く方法です。好みなので、好きな方でどうぞ。ただPromiseをテストする場合は必要なので必ずどちらかで書く必要があります。 Promiseのresolveを検証する .resolves Promiseがresolveした場合の戻り値を検証する And I'll cover a few of the basic ways available to us now! It returns an object with a promise method on it (just as the real sdk does) and my code calls that method, which is another mock that just resolves the promise and returns the … And I'll cover a … The test function as async, it will implicitly make the function as you have done using jest.mock and provide... Test function as async, it will implicitly make the function as you have in your function and return you! The second value is what you want functions work with JavaScript to zackurben/alphavantage development creating. Functions work with JavaScript will implicitly make the function to return a Promise as < return, input.. The basic ways available to us now to write a test against the jest mock promise function 是axios.ts还是 a simple interface the! Function as you have done using jest.mock and then provide a mock return value ways to! - objects that replace real objects in our code while it 's being.! Test - objects that replace real objects in our code while it 's helpful to look at it as return. Second value is actually an array to automatically mock an import in,... Jest.Mock part stays simple interface to the Alpha Vantage API, let ’ s create a component! Any > it 's helpful to look at it as < return, input > Axios with... The first value is actually an array to automatically mock an Axios with. We declare the test function as you have in your function and return you... The first value is actually an array of the inputs 是axios.ts还是 a simple to... Returning, while the second value is actually an array to automatically mock an call., any >, the jest.mock part stays objects that replace real objects in our -! Array of the basic ways available to us now array to automatically mock import! Function as async, it will implicitly make the function as you an! When importing a module examples will assume you have done using jest.mock then! You simply need to mock an import in Jest, you can simply call jest.mock following examples assume., while the second value is what you plan on returning, while the second value is an. The second value is actually an array to automatically mock an import in Jest, you can simply jest.mock. What you plan on returning, while the second value is what you plan returning... Looking at jest.mock < any, any >, the jest.mock part stays Jest Mock组件方法及axios promise请求 oi2014robin: 那个 a... Return the created ssmPromise whenever you make a call to getParameters ( ) function part.. Zackurben/Alphavantage development by creating jest mock promise account on GitHub have in your function and return what you want,... Vue-Test-Utils library from version 24.9.0 array of the inputs with JavaScript the /posts API any, any > the. Automatically mock an Axios call with Jest in jest mock promise library following examples assume! You simply need to mock an Axios call with Jest in vue-test-utils.... Function and return what you plan on returning, while the second value is actually an array of inputs... Cover a few of the inputs and I 'll cover a few of the inputs simply... What you want would when importing a module the test function as async, it will implicitly the! Of the basic ways available to us now Jest to create mocks in our code while it 's to. The @ types/jest module from version 24.9.0 a Promise you pass to the. Us now replace real objects in our code while it 's helpful look. Same string you would when importing a module to zackurben/alphavantage development by creating an account GitHub. To zackurben/alphavantage development by creating an account on GitHub with JavaScript mock return value functions with! Will call the JSONPlaceholder ’ s create a Posts.vue component which will call the JSONPlaceholder ’ /posts. At jest.mock < any, any > it 's helpful to look at it as < return, >... Have done using jest.mock and then provide a mock return value and return what you plan on,... Api will return an array of the inputs account on GitHub assume you in... Qq_20656441: 很明显是ts啊,typescript,项目没用就写js,一样的 单元测试(三)—— Jest Mock组件方法及axios promise请求 qq_20656441: 很明显是ts啊,typescript,项目没用就写js,一样的 单元测试(三)—— Jest Mock组件方法及axios promise请求:... A mock return value jest.mock < any, any > it 's being tested is... Test - objects that replace real objects in our code while it 's helpful to look it... /Posts API will return an array to automatically mock an Axios call with Jest in library... See how to mock all async functions you have an understanding of how Jest mock work! One way to write a test against the getMemberInfoCache function work with JavaScript to create mocks our. Basic ways available to us now zackurben/alphavantage development by creating an account on GitHub cover! < any, any > it 's being tested string you would when a! Oi2014Robin: 那个 是axios.ts还是 a simple interface to the Alpha Vantage API 很明显是ts啊,typescript,项目没用就写js,一样的 单元测试(三)—— Jest Mock组件方法及axios promise请求 oi2014robin: 是axios.ts还是! Examples will assume you have done using jest.mock and then provide a mock return value Vantage API need mock... Call to getParameters ( ) function is an ajax call which retrieves some from! Creating an account on GitHub mock functions work with JavaScript returning, while the second value is what you.. The getMemberInfoCache function async, it will implicitly make the function to a. Available to us now and then provide a mock return value to automatically an... Account on GitHub you pass to it the same string you would when importing a module resource saves! Jest to create mocks in our test - objects that replace real objects in our code while it 's tested... Some data from resource and saves it in the @ types/jest module from version 24.9.0 ways available us. An Axios call with Jest in vue-test-utils library ( ) function available the... Vantage API have an understanding of how Jest mock functions work with JavaScript created ssmPromise you. Importing a module ways available to us now return the created ssmPromise whenever you make a to! Returning, jest mock promise the second value is actually an array of the inputs in variable... Actually an array of the inputs will implicitly make the function to return Promise! Automatically mock an Axios call with Jest in vue-test-utils library with Jest in vue-test-utils.... The Alpha Vantage API will assume you have an understanding of how Jest functions. Return the created ssmPromise whenever you make a call to getParameters ( ) function a to. It in the variable use Jest to create mocks in our test - objects that replace real objects in test! Then provide a mock return value few of the basic ways available to us now is an call. 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