enzyme | JavaScript Testing utilities for React | Unit Testing library

 by   enzymejs JavaScript Version: enzyme-adapter-react-16@1.15.7 License: MIT

kandi X-RAY | enzyme Summary

kandi X-RAY | enzyme Summary

enzyme is a JavaScript library typically used in Testing, Unit Testing, React applications. enzyme has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can install using 'npm i yamensharaf-enzyme' or download it from GitHub, npm.

[Join the chat at [Coverage Status] Enzyme is a JavaScript Testing utility for React that makes it easier to test your React Components' output. You can also manipulate, traverse, and in some ways simulate runtime given the output. Enzyme’s API is meant to be intuitive and flexible by mimicking jQuery’s API for DOM manipulation and traversal. Upgrading from Enzyme 2.x or React < 16. Enzyme is unopinionated regarding which test runner or assertion library you use, and should be compatible with all major test runners and assertion libraries out there. The documentation and examples for enzyme use [Mocha] and [Chai] but you should be able to extrapolate to your framework of choice.

            kandi-support Support

              enzyme has a medium active ecosystem.
              It has 19985 star(s) with 2095 fork(s). There are 264 watchers for this library.
              It had no major release in the last 6 months.
              There are 255 open issues and 1512 have been closed. On average issues are closed in 269 days. There are 33 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of enzyme is enzyme-adapter-react-16@1.15.7

            kandi-Quality Quality

              enzyme has 0 bugs and 0 code smells.

            kandi-Security Security

              enzyme has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              enzyme code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              enzyme is licensed under the MIT License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              enzyme releases are not available. You will need to build from source code and install.
              Deployable package is available in npm.
              Installation instructions are not available. Examples and code snippets are available.

            Top functions reviewed by kandi - BETA

            kandi has reviewed enzyme and discovered the below as its top functions. This is intended to give you an instant insight into enzyme implemented functionality, and help decide if they suit your requirements.
            • Convert a Fiber node into a buffer .
            • Find the current path of the given fiber .
            • Reduce tree based on CSS selector
            • Determines if a node matches the attribute selector .
            • Map React events to React events .
            • Converts an instance into DOM tree .
            • Wrap a property on an object .
            • Matches a node against a token .
            • Transform an rendered element .
            • Internal recursive comparison function .
            Get all kandi verified functions for this library.

            enzyme Key Features

            No Key Features are available at this moment for enzyme.

            enzyme Examples and Code Snippets

            Using enzyme with JSDOM
            npmdot img1Lines of Code : 46dot img1no licencesLicense : No License
            copy iconCopy
            /* setup.js */
            const { JSDOM } = require('jsdom');
            const jsdom = new JSDOM('');
            const { window } = jsdom;
            function copyProps(src, target) {
              Object.defineProperties(target, {
            Using enzyme with JSDOM
            npmdot img2Lines of Code : 46dot img2no licencesLicense : No License
            copy iconCopy
            /* setup.js */
            const { JSDOM } = require('jsdom');
            const jsdom = new JSDOM('');
            const { window } = jsdom;
            function copyProps(src, target) {
              Object.defineProperties(target, {
            Import Enzyme from the Enzyme setup file
            npmdot img3Lines of Code : 5dot img3no licencesLicense : No License
            copy iconCopy
            /* some_test.js */
            // Import anything you would normally import `from 'enzyme'` from the Enzyme setup file
            import { shallow } from './test/enzyme';
            // ...

            Community Discussions


            Heroku Shopify Application Error 'npm ERR! ERESOLVE unable to resolve dependency tree'
            Asked 2022-Apr-03 at 07:31

            Greetings I have a problem with Heroku because it's don't want to install legacy packages for my Shopify app, my Shopify app is on Github and I just set up everything that my application needs, but when I deploy the main branch on Heroku I get this error in Heroku console below, can someone help me fix this?



            Answered 2022-Feb-10 at 13:23

            Your lock file contains conflicting dependencies. Since you were able to reproduce the error locally using npm ci we have a good way to test a fix locally.

            It looks like you are depending directly on React 16. Is that something that you need directly, or is it just a dependency for Next.js?

            If it's not something you need directly, upgrade it per the Next.js docs:

            Source https://stackoverflow.com/questions/71065040


            How to rebuild epoll package in electron?
            Asked 2022-Mar-18 at 11:41

            I try to rebuild an electron app but I got this error regarding the epoll installation.



            Answered 2021-Nov-09 at 06:01

            I have a same problem too, but i am using a serialport not epoll.

            So, I think the cause of this problem is electron modules not the native module.

            Source https://stackoverflow.com/questions/69882740


            Craco does not work properly with react-scripts@5.0.0
            Asked 2022-Feb-23 at 10:05

            After upgrading react-scripts to v5, craco start does not work properly. App starts with no error but in browser, there is a blank page and if i open inspector, i only see index.html codes not react codes. It was working well with react-scripts@4.0.3. Here is my local files;




            Answered 2022-Feb-23 at 10:05

            craco's Github readme, states that it is supporting Create React App (CRA) 4.*. By this statement, I'm assuming CRA 5 is not officially supported by craco.

            However, this repository utilizes both CRA 5 and craco (but I have not verified that it is working). Use this repository to compare your setup (after verifying that the linked repositry is working), and try different settings/configs to see if you get further.

            Source https://stackoverflow.com/questions/71234041


            Julia: Zygote.@adjoint from Enzyme.autodiff
            Asked 2022-Feb-15 at 10:30

            Given the function f! below :



            Answered 2022-Feb-15 at 10:30

            Could figure out a way, sharing it here.

            For a given function foo, Zygote.pullback(foo, args...) returns foo(args...) and the backward pass (which allows for gradients computations).

            My goal is to tell Zygote to use Enzyme for the backward pass.

            This can be done by means of Zygote.@adjoint (see more here).

            In case of array-valued functions, Enzyme requires a mutating version that returns nothing and its result to be in args (see more here).

            The function f! in the question post is an Enzyme-compatible version of a sum of two arrays.

            Since f! returns nothing, Zygote would simply return nothing when the backward pass is called on some gradient passed to us.

            A solution is to place f! inside a wrapper (say f) that returns the array s

            and to define Zygote.@adjoint for f, rather than f!.


            Source https://stackoverflow.com/questions/71114131


            Time-dependent covariates- is there something wrong with this code? (R program)
            Asked 2022-Feb-08 at 05:23

            I am checking a few of my Cox multivariate regression analyses' proportional hazard assumptions using time-dependent co-variates, using the survival package. The question is looking at survival in groups with different ADAMTS13 levels (a type of enzyme).

            Could I check if something is wrong with my code itself? It keeps saying Error in tt(TMAdata$ADAMTS13level.f) : could not find function "tt" . Why?

            Notably, ADAMTS13level.f is a factor variable.



            Answered 2022-Feb-08 at 05:23

            @Limey was on the right track!

            The time-transformed version of ADAMTS13level.f needs to be added to the model, instead of being separated into a separate argument of coxph(...).

            The form of coxph call when testing the time-dependent categorical variables is described in How to use the timeSplitter by Max Gordon.

            Other helpful documentation:

            coxph - fit proportional hazards regression model

            Source https://stackoverflow.com/questions/70875105


            Testing side effects in React Typescript components with Jest and enzyme
            Asked 2022-Jan-05 at 22:58

            I'm really trying to get an understanding of how to properly unit test with React + TS, but it's really been tough going so far. I have two very simple components I'm using to isolate things. I'll include the components at the bottom so I don't clutter things too much.

            Pretty simple, click the Button and the change from 'hello' to 'world' in the state variable data is displayed in InnerComponent. From everything I've seen, the pattern is to test for side effects in the document rather than trying to test the state changes themselves (and thank goodness for that, I had a nightmare of a time trying to access state in the wrapper instance with Typescript). However, eslint hates screen and TS cannot find findByText. Instead I get the error Property 'findByText' does not exist on type 'Screen'.ts(2339) on the noted lines in the test below:



            Answered 2022-Jan-05 at 22:58

            There is a separate "screen" object exported from '@testing-library/react'. that has the findByText method. you unfortunately have to manually grab screen out of the library as auto imports just think its the global "screen" when you don't import explicitly.

            Source https://stackoverflow.com/questions/70600467


            React Router V6 - useNavigate() may be used only in the context of a component
            Asked 2021-Dec-10 at 08:43

            I have installed react-router-domV6. I am having the above error when I run my very basic test using Jest-Enzyme:



            Answered 2021-Nov-19 at 05:09

            It seems the CustomerListTable component you are testing in isolation doesn't have access to a routing context it's expecting as when it's rendered in the app normally. It's completely normal to need to wrap components when testing them with providers (redux, themes/styling, localization, routing, etc...) that are providing specific React Context values the component is accessing, typically via React hooks.

            For the unit test you should wrap the component with the providers it's expecting to have.

            Source https://stackoverflow.com/questions/70029935


            React + Jest Testing Error - ReferenceError: expect is not defined
            Asked 2021-Nov-11 at 18:05

            I have literally trawled everywhere for an answer to this and possibly tried 99% of things out there so i decided to start a thread of its own so others can run their eyes over what i have currently and see if they can spot the issue.

            i am very new to Jest testing and decided to try implement it onto our code base. i used this guide to make sure everything i done was perfect but still this error occurs A Practical Guide To Testing React Applications With Jest

            I am testing this aginst a simple functional component which uses react-hook-form to produce a form on the page and then sends the completed form to our backend via a redux call

            I have setup the setupTests.js file as:



            Answered 2021-Nov-11 at 18:05

            You would want to set up the files after the test framework has been installed

            Here are a couple of ways you can go about doing it (For this particular question, method 1 is more relevant)

            1) react-scripts

            Replace/Add --setupFilesAfterEnv instead of using --setupFiles

            Example: "test": "react-scripts test --setupFilesAfterEnv

            2) jest.config.js

            Source https://stackoverflow.com/questions/69932488


            Why does this official React testing recipe using await/act/async actually work?
            Asked 2021-Nov-02 at 10:43

            I've been working with Javascript for a couple of years now, and with my current knowledge of the event loop I'm struggling to understand why this testing recipe from the React docs work. Would someone be able to break down exactly what happens in each step there? To me, it seems magical that this works in the test:



            Answered 2021-Nov-02 at 10:43

            When looking closer at the source code of react-dom and react-dom/test-utils it seems like what's making this whole thing work is this setImmediate call happening after the first effect flush in recursivelyFlushAsyncActWork.

            It seems like act chooses to use this recursivelyFlushAsyncActWork simply because the callback has the signature of being "thenable", i.e. a Promise. You can see this here.

            This should mean that what happens is (simplified) this:

            1. The useEffect callback is flushed (putting fetch on the event loop).
            2. The setImmediate callback "ensures" our mock promise / fetch is resolved.
            3. A third flush happens by a recursion inside the setImmediate callback (called by enqueueTask) making the state changes appear in the DOM.
            4. When there's nothing left to flush it calls the outer most resolve and our act resolves.

            In the code that looks kinda like this (except this is taken from an older version of react-dom from the node_modules of my React project, nowadays flushWorkAndMicroTasks seems to be called recursivelyFlushAsyncActWork):

            Source https://stackoverflow.com/questions/69775101


            Error when unit testing child React component
            Asked 2021-Oct-16 at 20:58

            I have the following React Component:



            Answered 2021-Oct-16 at 20:58

            Had to make a few changes to my original test suite and this is what worked for me:

            Source https://stackoverflow.com/questions/69534006

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install enzyme

            You can install using 'npm i yamensharaf-enzyme' or download it from GitHub, npm.


            Enzyme supports [react hooks](https://reactjs.org/docs/hooks-intro.html) with some limitations in [.shallow()](https://enzymejs.github.io/enzyme/docs/api/shallow.html) due to upstream issues in React’s shallow renderer:.
            Find more information at:

            Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items

            Find more libraries
          • HTTPS


          • CLI

            gh repo clone enzymejs/enzyme

          • sshUrl


          • Stay Updated

            Subscribe to our newsletter for trending solutions and developer bootcamps

            Agree to Sign up and Terms & Conditions

            Share this Page

            share link