Jest Enzyme Example

Unit testing with Enzyme and Jest and How to You had a taste of what its like to set your React project up with unit testing and now you want some more? Where to start, I think for this particular post I'll demonstrate how to do some simple assertions and check conditions to be true. If our function calls other functions, we want to test that the other functions are called under the right criteria with the right arguments. But jest doesn't come with specific React helpers and this is what enzyme is for: providing you testing utilities for React. fn()), you could also make assertions on those as well if you wanted. The Enzyme package, from Airbnb, appears to solve some of the problems I ran into when using plain Jest. Introduction. We won't go into the details of installing and setting up Jest in a project. Example enzyme. Unia Europejska jest zarówno beneficjentem, jak i stroną dokonującą bezpośrednich inwestycji zagranicznych. TypeScript Deep Dive. John Vincent's discussion on Basic React Testing with Jest and Enzyme. Jest is very fast and easy to use. Returns a CheerioWrapper around the rendered HTML of the single node's subtree. Installing the packages. I must admit it’s quite comfortable to use. Using Jest to Create Unit Tests. render() => CheerioWrapper. If the change is expected, you can invoke Jest with jest -u which will overwrite the existing snapshot. Why Using Jest. There will usually be more than one test per file. Jika anda sedang menggunakan React dengan versi dibawah 15. Shallow rendering. Enzyme allows you to test react components with dom support. Here is a home component, which contains a button and a piece of counter state. If your doctor thinks something could be wrong with your pancreas-- the organ in your belly that helps you digest food -- she may do an amylase test. fn() for spies. To do that, we spy on other functions. What are your thoughts on writing tests in React? I'd love to hear them in the comments. We still need to install enzyme and enzyme-adapter-react-16 (that number should be based on whichever version of React version you're using). januar 2019 , Tom Risager react create-react-app is a great tool that lets you setup a React development environment quickly, without having to first become an expert on Webpack, Babel, and all the other tools you will need to be effective. Then we create a state spy so that we can check that React's useState function is called. Being new to Jest unit testing and snapshot testing, I find the Jest docs to be too simplistic for real-word application. // This is not really a mock, but jest prevents out of scope. In addition, by leveraging Enzyme's API, we are able to easily traverse components and test them. We can then interact with the DOM and assert that our rendered components are. My example is a both a multi-tenant and a hierarchical system, which is what one of my client’s needed. Jest with Enzyme Enzyme is a JavaScript testing utility built by the team at Airbnb. Photobiomodulation therapy is defined as the utilization of non-ionizing electromagnetic energy to trigger photochemical changes within cellular structures that are receptive to photons. Installation yarn install Commands. The first thing Jest does is load the tests and thus load the source code of your application parsing the requires() and imports to generate a graph of interdependencies. Testing React Styled Components with Jest & Enzyme August 23, 2017 By Dan Lawson At Fast Web Media we develop a number applications - from small scale , to large scale. The only documentation that I found online for testing React Apollo component is a comment from React Apollo team on GitHub, and it is not using Enzyme. The documentation is simple and well illustrated with many examples and different tips. Let’s take a look at how Jest and Enzyme can be leveraged to create more robust React applications. Using Jest to Create Unit Tests. The most common Coenzyme Q in human mitochondria is CoQ 10. However, we noticed most of the native component nodes were missing. Specific to a testing framework (though we recommend Jest as our preference, the library works with any framework. com In the next tutorial, I will dive more into testing with Jest and Enzyme by writing tests for rendering, interactions, and lifecycle method calls. js file to customize Jest environment (see setupFiles above): import Enzyme, { shallow, render, mount } from 'enzyme';. Using Jest to Create Unit Tests. Specifically, testing has progressed with the new revamped version of Jest (The "official" Facebook React testing tool) That being said, Enzyme (A popular third party React testing library by AirBnB) is still a vital part of the React testing stack. In this post, I wanted to go through getting started with snapshot testing using Jest in a simple GatsbyJS blog. Currency exchange application for Revolut task. However, there are valid reasons why developers compare the two. It's always up to date With an Office 365 subscription, you get the latest Office apps—both the desktop and the online versions—and updates when they. Jest is fast and easy to use, It has all you need together under the same tool, and it's pretty easy to create all kind of test, even asynchronous ones. In this post, we'll develop a React app using Test-Driven Development (TDD) with Jest and Enzyme. Aspartate transaminase (AST) or aspartate aminotransferase, also known as AspAT/ASAT/AAT or (serum) glutamic oxaloacetic transaminase (GOT, SGOT), is a pyridoxal phosphate (PLP)-dependent transaminase enzyme (EC 2. Snapshot Testing. If we are more interested in grabbing a specific piece of a larger component, say to ensure text is being formatted correctly, we can mount our component and use enzyme to traverse the DOM and extract a specific value. januar 2019 , Tom Risager react create-react-app is a great tool that lets you setup a React development environment quickly, without having to first become an expert on Webpack, Babel, and all the other tools you will need to be effective. React Testing: An Integrated Example. Enzyme/Jest: the survival guide. Just keeping up with JS & React ecosystems is a full-time job! Redux, MobX, GraphQL/Apollo/Relay, Jest, Enzyme, Babel, Webpack, ESLintplus frequent React releases, annual JS versions, and countless npm packages! #javascript #greatproblem”. The problem with that article is that it's a bit on the Hello World level and not nearly enough to really be able to start testing. View console. That said, you're on the right track for using a mock function. jasmine-enzyme with Jasmine. #Setting Up. 0, anda juga perlu untuk memasang react-addons-test-utils. yarn add enzyme enzyme-adapter-react-16 --dev. You can find the first part here. ) Shallow Rendering. What are your thoughts on writing tests in React? I'd love to hear them in the comments. Create a test/jestsetup. An enzyme is a JavaScript testing utility for React that makes it easier to assert, manipulate, and traverse your React Components' output. This post is part of a series on Real-world ReactNative apps made easy with RNE, Jest and MobX MST. Of course, you will want to mock out axios so that there are no network calls during your tests. There are other adapters in Enzyme’s installation instructions. We then wrote a couple of tests for a demo application using ReactTestUtils and discovered its shortcomings compared to a more robust library like Enzyme. There are many excellent "getting started with Jest" posts, but not as many clear examples of mocked external dependencies. Here is an example from Enzyme documentation that asserts specific output, rewritten to use Jest matchers:. Jest test event listener. I do this utilizing hooks that are provided by the Jest testing framework. js: Configuring Wallaby. Next, we need to create a setup file for our tests. First of all, we need to create our React component to test it. To run the setup file to configure Enzyme and the Adapter (as shown in the Installation docs) with Jest, set setupFilesAfterEnv (previously setupTestFrameworkScriptFile) in your config file (check Jest's documentation for the possible locations of that config file) to literally the string and the path to your setup file. I really enjoy using Jest as my testing framework. Photobiomodulation therapy is defined as the utilization of non-ionizing electromagnetic energy to trigger photochemical changes within cellular structures that are receptive to photons. Hence leech therapy uses them to minimize pain of varicose veins by sucking accumulated blood. This is the source code for the tutorial series on "Testing with Jest and Enzyme in React" … github. Despite its popularity, React Apollo client has no good documentations on how to do testing for React Apollo components with Enzyme. Facebook's Jest/TypeScript example outlines the strategy: set up a preprocessor like ts-jest to handle compilation and source-mapping, then feed the processed files to jest. fn() for spies. The problem comes when we try to write a unit test (in my case, using Jest and Enzyme) for this component. Setting up should be pretty straight-forward, once you follow these instructions: Jest and then Enzyme. React enables us to write declarative components describing the user interface and provide the data needed to render these interfaces. Let's take a look at how Jest and Enzyme can be leveraged to create more robust React applications. If you are wondering how the heck Jest knows what tests are affected by commit changes, you are not alone. yarn start:web - runs the Web version of the app in the development mode. Jest1 is something like one of a hundred different unit testing frameworks for Javascript. Jest makes it very easy to test React applications. januar 2019 , Tom Risager react create-react-app is a great tool that lets you setup a React development environment quickly, without having to first become an expert on Webpack, Babel, and all the other tools you will need to be effective. It lets you simulate DOM rendering and actions on the components and integrates well. It can be a little unclear how create-react-app, Jest, and Enzyme should work Together. Jest, Enzyme, Back End: Mocha, Chai Minimum Qualifications. Here's what I learned: There are so many different frameworks when developing with JavaScript so let's first look at what Jest and Enzyme are. element and input name attributes so we can use the toHaveFormValues matcher to more easily assert if the form values are what we expect:. We modified an existing test but didn’t dive into testing. If you haven't ejected your app yet, you will need to do so in order to add the serializer. I was responsible for implant it in our company projects, and it was the best. Access to the instance also allows you to spy on component methods using jest. react-test-renderer is primarily for snapshots, while enzyme is for whenever you need to actually interact with the component, like simulate clicking it, feed it new props and see how it changes, etc. This is the first of maybe a couple of posts that I am going to be doing on testing React components and TDD in general. An enzyme is a JavaScript testing utility for React that makes it easier to assert, manipulate, and traverse your React Components' output. Because most of the Redux code you write are functions, and many of them are pure, they are easy to test without mocking. Usage with Create React App. Whenever writing tests, no matter what testing libraries are used, it is always important to structure them properly. These examples have just been some simple tests that you can write using Jest and Enzyme. Enzyme is a JavaScript utility library created by Airbnb. npm install --save-dev enzyme. jest-enzyme の import は通常 config を通して行われ、テストコードそれ自体に入らない。 create-react-app を利用した場合も事情は同じ。 以上のことから、コンパイラや IDE が前述の型定義ファイルをみつけることができなくなっている。. So no, not part of the class itself. Access to the instance also allows you to spy on component methods using jest. Other useful examples. Likewise, the enzyme amylase , which is present in saliva, converts starch into sugar, helping to initiate digestion. With other solutions, one has to choose and assemble individual components of a testing suite. We need to be able to supply window. Aspartate transaminase (AST) or aspartate aminotransferase, also known as AspAT/ASAT/AAT or (serum) glutamic oxaloacetic transaminase (GOT, SGOT), is a pyridoxal phosphate (PLP)-dependent transaminase enzyme (EC 2. First of all what are Jest and Enzyme? Jest was. Jest is an open-source test framework created by Facebook that has a great integration with React. Last time we began with the project overview, which included a brief explanation of Test-Driven Development (TDD), the application design process, and a high-level synopsis of the application components. It must be a single-node wrapper. npm install jest enzyme enzyme-adapter-react-16 --save-dev. #Setting Up. Add this to your component: React and Jest. Adding more tests. Enzyme + Mocha. Jest provides a very simple way to generate coverage. Enzyme levels can also be regulated by changing the rate of enzyme degradation. Dihydrotestosterone (DHT) is a hormone linked to hair loss and other health issues. And though it has good competition now (see the next article!), it's still used by many teams. If the change is expected you can invoke Jest with jest -u to overwrite the existing snapshot. Facebook's Jest/TypeScript example outlines the strategy: set up a preprocessor like ts-jest to handle compilation and source-mapping, then feed the processed files to jest. (Note: In the examples below I'm using Mocha with Chai and Karma as the test runner, but Enzyme can be used with pretty much any testing setup. To configure an adapter, you should call `Enzyme. Currency exchange application for Revolut task. “Enzyme is a JavaScript Testing utility for React that makes it easier to assert, manipulate, and traverse your React Components’ output”. To the former belong the ordinary leguminous crops - the clovers, beans, peas, vetches or tares, sainfoin, lucerne, for example - which obtain their nitrogen from the air, and are independent of the application of nitrogenous manures, whilst in their roots they accumulate a store of nitrogen which will ultimately become available for future. 0, anda juga perlu untuk memasang react-addons-test-utils. Structural analyses, supported by biochemical experiments and enzyme activity assays, indicate that the recognition and methylation of β-actin by SETD3 are highly sequence specific, and that both SETD3 and β-actin adopt pronounced conformational changes upon binding to each other. Integrating enzyme with Jest is just a three step process. windowData for our tests. You can do that by calling jest. OK, that creates our project and gets us both Jest and Enzyme in our project in two commands. Snapshot Testing. js for SPFx + React Projects that use Enzyme. You can have a look at a very simple bare bone example by the cool folks at jest. There are many excellent "getting started with Jest" posts, but not as many clear examples of mocked external dependencies. But have you tested it?. First of all, we need to create our React component to test it. I really enjoy using Jest as my testing framework. In the examples below are commonly used Enzyme methods to help get started. Let’s look at another example. jest Jest is the test library on which we will run our tests. To test the output of your React components you can use the library jest-expo-enzyme, which extends jest-expo and adds universal Enzyme support. The default react-native boilerplate comes with Jest. Basic Reducer Structure and State Shape Beyond combineReducers Computing Derived Data Immutable Update Patterns Implementing Undo History Initializing State Isolating Redux Sub-Apps Managing Normalized Data Migrating to Redux Normalizing State Shape Prerequisite Reducer Concepts Recipes Reducing Boilerplate Refactoring Reducer Logic Using Functional Decomposition and Reducer Composition. I also use Enzyme to complement, and both together are amazing. Enzyme allows you to test react components with dom support. npm install --save-dev enzyme react-test-renderer npm install --save-dev enzyme-adapter-react-16 I believe we no longer need to use react-addons-test-utils. Introduction: — This blog is for how to test React component with Enzyme and Jest. Create the environment To understand the problem, let's say I'm about to create a NavigationBar component which includes a Link or NavLink. The next 2 assertions are asking the jest. We will start our tests with React utils and then transition to Enzyme later on. Next, we need to create a setup file for our tests. OK, that creates our project and gets us both Jest and Enzyme in our project in two commands. Test framework allows you to run the test cases and test suites. Run npm test (or npm t) to run all tests. In this article we learned a number of new concepts. json as above, you will need to add a src/setupTests. Enzyme in Jest Setup. This example shows how data polling can be implemented using React, Redux, and Thunk. The molecule is called a substrate. First of all what are Jest and Enzyme? Jest was. Mock Axios in React Jest+Enzyme Tests. This feature is not available right now. Of course, you will want to mock out axios so that there are no network calls during your tests. In order to use these strategies, we are going to use two tools that come in handy to work with tests in React. Enzyme makes it effortless testing React components with integration and unit tests. jest-enzyme の import は通常 config を通して行われ、テストコードそれ自体に入らない。 create-react-app を利用した場合も事情は同じ。 以上のことから、コンパイラや IDE が前述の型定義ファイルをみつけることができなくなっている。. Delightful JavaScript Testing. I don't think i have to tell you the importance of unit testing your code, so i'll dive in directly to unit testing with Jest and Enzyme. Biswadeep is an excellent developer and a great person to work with. Please try again later. and we able to implement our test with enzyme! Let's see on the example below:. We then wrote a couple of tests for a demo application using ReactTestUtils and discovered its shortcomings compared to a more robust library like Enzyme. We will start our tests with React utils and then transition to Enzyme later on. If you want to mock some of the core modules of Node (for example fs or path) you need to explictly call jest. Enzyme is a renderer for Jest by Airbnb that replaces what we get out-of-the-box from Jest. There are many example projects created by the React community. Enzyme isn’t a testing framework, but rather a testing utility for React that makes it easier to test the outputs of components, abstracting the rendering of components. In order to use these strategies, we are going to use two tools that come in handy to work with tests in React. We are going to attempt writing tests for a simple React Tic Tac Toe app using Jest npm package developed by Facebook as well as Enzyme testing utility created by AirBnb. Testing react application with jest and enzyme - easy example on a connected component with code snippets and basic explanation. Hence leech therapy uses them to minimize pain of varicose veins by sucking accumulated blood. Let’s put it to action with a short example. fetch('data') is just an example. Specifically, this article discusses why I prefer often prefer Tape when testing ReactJS applications. js , just paste below code :. If you return a promise from componentDidMount, Enzyme will wait for the promise to resolve during rendering. The problem with that article is that it's a bit on the Hello World level and not nearly enough to really be able to start testing. #Setting Up. In this article we learned a number of new concepts. It lets you simulate DOM rendering and actions on the components and integrates well. The instance methods can be spyed upon using the code jest. Thank you for the article, exactly what I was looking when it comes to Jest and Enzyme. 1 [email protected] Enzyme and snapshots in harmony Lately I've been playing around with jests Snapshot Testing after having manually set-up similar UI-tests with enzyme. Run npm test (or npm t) to run all tests. For more than 4 years, I am working with international teams in different timezones. Anti-androgen drugs are often prescribed in addition to estrogen, as the two have effects that complement each other. It provides a bunch of helpful methods that enhance how we test React components. Note that it runs in a Node environment, so you won't have access to the DOM. In this note, I prepared two examples. spyOn(), which can be useful to ensure that complex interactions between helper methods occur as expected. TypeScript Deep Dive. // This is not really a mock, but jest prevents out of scope. In this post, I wanted to go through getting started with snapshot testing using Jest in a simple GatsbyJS blog. yarn add enzyme enzyme-adapter-react-16. Jest allows us to spy on functions: let's now test if the get function that we created is called. If you are using shouldJS then you can try should enzyme to help with Enzyme assertions. In this article we gonna take a look at awesome testing tool Jest and how to use it with React and Enzyme. At the end of the blog post you will also find a link to the complete repository. If you have already drank the unit test kool-aid and are looking for a simle example on how to create unit test for your React component using Jest and Enzyme, well you have come to the right place. Dihydrotestosterone (DHT) is a hormone linked to hair loss and other health issues. Jest is a library for testing JavaScript code. Prerequisites. See Using Without Jest) NOTE: This library is built on top of DOM Testing Library which is where most of the logic behind the queries is. With this library, testing of data types is much easier and more enjoyable. This feature is not available right now. Enzyme Internal Error: Enzyme expects an adapter to be configured, but found none. js file to your app, to import jest-enzyme: //. Running tests. Here we're rendering a paragraph of text using the Enzyme's mount() method, then testing that a rendered tree contains "Hello Jest!" text using the Enzyme's text() method and Jest's toMatch() assert. shallow rendering comparison (test utils and Enzyme). But jest doesn't come with specific React helpers and this is what enzyme is for: providing you testing utilities for React. So, Jest and Enzyme are distinct tools, but they complement each other well. Setting up the Sample Project. The problem comes when we try to write a unit test (in my case, using Jest and Enzyme) for this component. There will usually be more than one test per file. Finally, React makes it all possible!. This example shows how data polling can be implemented using React, Redux, and Thunk. Just keeping up with JS & React ecosystems is a full-time job! Redux, MobX, GraphQL/Apollo/Relay, Jest, Enzyme, Babel, Webpack, ESLintplus frequent React releases, annual JS versions, and countless npm packages! #javascript #greatproblem”. Testing react application with jest and enzyme - easy example on a connected component with code snippets and basic explanation. You'll see something like this:. In this first article, I will focus on testing React Native components and the pros and cons of using the new Snapshot system provided by Jest vs. Convert Enzyme wrappers to a format compatible with Jest snapshot testing. To configure Jest and the awesome Enzyme library from the Airbnb guys, and get them both to work on your brand new React Native project, just do the following: Install dependencies yarn add --dev enzyme enzyme-adapter-react-16 enzyme-to-json react-dom Set Jest configuration in package. We can use Enzyme’s find() method, with jQuery-like selectors to find elements in the rendered component. Website powered by Babel Cosmos MDX Next. Setting up the Sample Project. Setup Jest & Enzyme. snapshotSerializers allows you to pass Enzyme wrappers directly to Jest’s snapshot matcher, without converting them manually by calling enzyme-to-json’s toJson function. By the age of 50, more than half the men in the U. The toJson() method from enzyme-to-json converts Enzyme wrappers to a format compatible with Jest snapshot testing. For example, we could check the classes which are toggled by using the method. jasmine-enzyme with Jasmine. When a snapshot test fails, you need to inspect whether it is an intended or unintended change. Jest is a testing framework created by Facebook, specifically for use with JavaScript and React. yarn add enzyme enzyme-adapter-react-16 --dev. fn()ですが、これはFunctionのモックを作成しています。Jestにはモックを作る機能も提供されています。. Get on my mailing list to find out how:. There will usually be more than one test per file. If you'd like to build a transformer with babel support, you can also use babel-jest to compose one and pass in your custom configuration options:. Photobiomodulation. Photobiomodulation therapy is defined as the utilization of non-ionizing electromagnetic energy to trigger photochemical changes within cellular structures that are receptive to photons. Here is a home component, which contains a button and a piece of counter state. So let's see how to pass the router context to child components when testing in Enzyme/Jest. We won't go into the details of installing and setting up Jest in a project. To get started, you will need to familiarize yo. After diving into the problem, we realized that react-native-mock was rendering null for the native components. I had hands on experience in working with libraries like React. It is a test runner, assertion library, and offers spies, stubs and mocks as well. #Writing Tests. In this note, I prepared two examples. Despite its popularity, React Apollo client has no good documentations on how to do testing for React Apollo components with Enzyme. This post is part of a series on Real-world ReactNative apps made easy with RNE, Jest and MobX MST. Q refers to the quinone head and 10 refers to the number of isoprene repeats in the tail. Phagocytosis, process by which certain living cells called phagocytes ingest or engulf other cells or particles. fn()ですが、これはFunctionのモックを作成しています。Jestにはモックを作る機能も提供されています。. Shallow utility helps us in rendering a component and allowing us access to the class methods/state of the component. This is part two of Test-Driven Development with React, Jest, and Enzyme. Here we're rendering a paragraph of text using the Enzyme's mount() method, then testing that a rendered tree contains "Hello Jest!" text using the Enzyme's text() method and Jest's toMatch() assert. (enzymeとか出てきてうわってなったかもしれません) またここで初めて出てきたjest. Around a month ago, I worked on a task, which required a more dynamic frontend behavior. Snapshots with react-test-renderer. How to Test React Component With Jest. We still need to install enzyme and enzyme-adapter-react-16 (that number should be based on whichever version of React version you’re using). Jest allows us to spy on functions: let's now test if the get function that we created is called. Note: We recommend using React Testing Library which is designed to enable and encourage writing tests that use your components as the end users do. First, we need to install Jest and Enzyme via npm or yarn. When your snapshot test fails, you will need to inspect whether it is an intended or unintended change. Run npm test (or npm t) to run all tests. com Testing React+Redux with Jest+Enzyme. Using Jest + Enzyme. Our 3 testing dependencies will be: jest for testing, babel-jest for transpiling our ES6, and enzyme for our functional React tests. Adecity is a sister brand of Okhlee. You can really test for anything, but the underlying point here is you don't really need to test componentWillMount or any of the react lifecycle methods. Let’s look at another example. yarn add enzyme enzyme-adapter-react-16 --dev. The chemical reaction takes place at this active site and a new molecule or substance, called the product, is then released by the enzyme. I’ve set it up, because the React team is using it. From a technical perspective, the example you take of a search bar has some potential issues: you end up creating an API call for every single keystroke which is both unnecessary and brings weird artefact in the UI if not locking. Upon completion, you will be able to: Use TDD to develop a React app; Test a React app with Enzyme and Jest; Write and use CSS variables for reuse and responsive design. The only documentation that I found online for testing React Apollo component is a comment from React Apollo team on GitHub, and it is not using Enzyme. It is a presentational component that displays the details of each individual product. This allows you to stay true to unit testing, only testing the component, and not asserting on children. TypeScript Deep Dive. To do this, run: npm test-- --coverage. Anyway, we’ve seen how a good front-end React test should work in theory. This post is part of a series on Real-world ReactNative apps made easy with RNE, Jest and MobX MST. Get on my mailing list to find out how:. In this post, I wanted to go through getting started with snapshot testing using Jest in a simple GatsbyJS blog. #Setting Up. I’ve set it up, because the React team is using it. Jest snapshots are a very useful tool when it comes to preventing unexpected changes in your UI/functions. In order to use the serializer, just add this line to your Jest configuration:. Jest is the most popular but it is always the best call? In this article, I provide some comparisons between the Jest and Tape. (Androcur®) can be used, but risks include depression and liver enzyme elevation so spironolactone is generally preferred. Testing Using Jest and Enzyme. To render your component in Jest unit tests, use either react-test-renderer or enzyme. Jest has some really, really cool features built in. I also use Enzyme to complement, and both together are amazing. com In the next tutorial, I will dive more into testing with Jest and Enzyme by writing tests for rendering, interactions, and lifecycle method calls. In the rest of this article, I share a broad conceptual overview of what Jest and Enzyme are, what they can do separately and combined, and some notes on how to get set up with them for any existing React projects. Jest typeerror 0 typeof4default is not a function завтра в 19:30 МСК 19:30 МСК. Anyway, we’ve seen how a good front-end React test should work in theory. That said, you're on the right track for using a mock function. Integrating Enzyme with Jest is just a two-step process. Examples Basic example import { shallow } from 'enzyme' import MyComponent from '. I must admit it’s quite comfortable to use. 0 [email protected] First of all, we need to create our React component to test it. That said, instead of comparing the two, this tutorial will show to how to use Jest and Enzyme together to test React applications. To do this, you can use the top level `configure()` API. yarn add enzyme enzyme-adapter-react-16 --dev. If you are interested in using enzyme with custom assertions and convenience functions for testing your React components, you can consider using: chai-enzyme with Mocha/Chai. Learn More: Writing Tests – Redux, Jest, Enzyme.