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Startups of The Year 2023 Winners: North America 

Snapshot testing is a powerful technique for ensuring that your React components behave as expected over time. With React Testing Library, you can easily implement snapshot testing to verify that your components are rendering correctly. In this article, we will explore the process of snapshot testing with React Testing Library, including why it’s a useful tool and how you can use it effectively in your own projects. Why you should migrate to RTL In my previous , I explained why you should migrate away from Enzyme and what tools you can build to support this migration. React Testing Library (RTL) is a great choice for migrating from Enzyme because it encourages testing the behavior of the application from the user’s perspective, rather than testing the internal implementation details. This makes the tests more robust and less prone to breaking when the implementation changes because they are focused on the outcome of an action, rather than testing the details of the implementation. post This leads to tests that are more readable, easier to maintain, and less brittle. But RTL can become a stumbling block if your project heavily relies on the JSX snapshots, or in other words, you are too lazy to write explicit assertions for your React components and simply do in all of your tests. expect(component).toMatchSnapshot() Why RTL is not good for snapshots? When your snapshot is more than a few dozen lines it’s going to suffer major maintenance issues and slow you and your team down. Remember that tests are all about giving you confidence that you wont ship things that are broken and you’re not going to be able to ensure that very well if you have huge snapshots that nobody will review carefully. I’ve personally experienced this with a snapshot that’s over 640 lines long. Nobody reviews it, the only care anyone puts into it is to nuke it and retake it whenever there’s a change… Kent C. Dodds (creator of RTL) React Testing Library is not necessarily “bad” for snapshot testing, but it is not designed to be used primarily for that purpose. Snapshot testing is often used to check that a component’s output remains the same, even if its implementation changes. While with Enzyme, you could simply use shallow API to produce a compact render tree you could match with the snapshot, with React Testing Library you would have to operate with the real DOM. Using Material UI as an example, if you had to snapshot a component that composes DataGrid component from this library, you would receive the following outputs: // with Enzyme shallow 
<DataGrid
  rows={[/*Rows data goes here*/]}
  columns={[/*Columns goes here*/]}
  pageSize={5}
  rowsPerPageOptions={[5]}
  checkboxSelection
/>

// with RTL
<div
  class="MuiDataGrid-root MuiDataGrid-root--densityStandard MuiDataGrid-withBorderColor css-1wgqnsa"
  role="grid"
  aria-colcount="6"
  aria-rowcount="2"
  aria-multiselectable="false"
>
  <div></div>
  <div class="MuiDataGrid-main css-opb0c2">
    <div
      class="MuiDataGrid-columnHeaders MuiDataGrid-withBorderColor css-1pzw8os"
      style="min-height: 56px; max-height: 56px; line-height: 56px;"
    >
      <div
        class="MuiDataGrid-columnHeadersInner css-vcjdx3"
        role="rowgroup"
        style="transform: translate3d(0px, 0px, 0px);"
      >
        <div role="row" aria-rowindex="1" class="css-k008qs">
... I intentionally did not put the entire HTML output here in the example, but you already see the difference. And you can also notice that HTML output contains hashed class names — this means, any time you consume a new version of the DataGrid component, you would get a new hash (this methodology is called “scoped class names” and it’s out of scope for this article). What to do? A piece of advice from Kent C. Dodds: “ ”. There is also a lint rule in called which could be pretty helpful in discouraging large snapshots. avoid huge snapshots and take smaller, more focused ones. While you’re at it, see if you can actually change it from a snapshot to a more explicit assertion (because you probably can 😉) eslint-plugin-jest “no-large-snapshots” However, I have another solution for you that is future-proof (compatible with the latest versions of React and RTL) and would not require you to re-write all the snapshot tests in your codebase. Moreover, it would be almost identical to the shallow snapshot produced by Enzyme! Word of caution — it works only with Jest, you may need to write another solution if you want to integrate it with something else. The solution is based on the library that is part of React ecosystem (see React ). You can be sure that it will work with the latest version of React (at the moment of writing it is 18.2.0) — here you can find the from Dan Abramov. react-shallow-renderer documentation commit Without further ado, let me introduce you to a solution: import React from 'react';
import ShallowRenderer from 'react-test-renderer/shallow';
import { isFragment, isLazy, isPortal, isMemo, isSuspense, isForwardRef } from 'react-is';

class ReactShallowRenderer {
  instance = null;
  shallowRenderer = null;
  constructor(children, { Wrapper = null } = {}) {
    this.shallowRenderer = new ShallowRenderer();
    this.shallowWrapper = Wrapper
      ? this.shallowRenderer.render(<Wrapper>{children}</Wrapper>)
      : this.shallowRenderer.render(children);
  }

  getRenderOutput() {
    if (!this.shallowWrapper) return this.shallowWrapper;
    const getNodeName = node => {
      return node.displayName || node.name || '';
    };

    const getWrappedName = (outerNode, innerNode, wrapperName) => {
      const functionName = getNodeName(innerNode);
      return outerNode.type.displayName || (functionName !== '' ? `${wrapperName}(${functionName})` : wrapperName);
    };

    const extractType = node => {
      if (typeof node === 'string') return node;
      const name = getNodeName(node.type) || node.type || 'Component';
      if (isLazy(node)) {
        return 'Lazy';
      }

      if (isMemo(node)) {
        return `Memo(${name || extractType(node.type)})`;
      }

      if (isSuspense(node)) {
        return 'Suspense';
      }

      if (isPortal(node)) {
        return 'Portal';
      }

      if (isFragment(node)) {
        return 'Fragment';
      }
      if (isForwardRef(node)) {
        return getWrappedName(node, node.type.render, 'ForwardRef');
      }
      return name;
    };

    const transformNode = node => {
      const extractProps = ({ children, ...props }, key) => {
        const childrenArray = Array.isArray(children) ? children : [children];
        return {
          children: childrenArray.filter(Boolean).flatMap(transformNode),
          props: {
            ...props,
            ...(key ? { key } : {}),
          },
        };
      };
      if (Array.isArray(node)) {
        return node.map(transformNode);
      }
      if (typeof node !== 'object') {
        return node;
      }
      return {
        // this symbol is used by Jest to prettify serialized React test objects: https://github.com/facebook/jest/blob/e0b33b74b5afd738edc183858b5c34053cfc26dd/packages/pretty-format/src/plugins/ReactTestComponent.ts
        $$typeof: Symbol.for('react.test.json'),
        type: extractType(node),
        ...extractProps(node.props, node.key),
      };
    };

    return transformNode(this.shallowWrapper);
  }
} The critical part here is how you output the tree. Jest has special requirements to print the React Test object in a prettified fashion: Test object needs to have in order to get integrated with the Jest serializer $$typeof: Symbol.for('react.test.json') refers to the name of the node that will be displayed ( ) type <ComponentName propA="1234" /> is an optional property that takes all children nodes that need to follow the same format, and - component properties that will be displayed as node attributes in the output. children props You can wrap it into a utility function and use it in your tests. The simplest example: const shallowRender = Component => new ReactShallowRenderer(Component).getRenderOutput(); Enter fullscreen mode Exit fullscreen mode If you are using Redux, you can enhance the example from Redux : documentation interface ExtendedRenderOptions extends Omit<RenderOptions, 'queries'> {
  preloadedState?: PreloadedState<RootState>
  store?: AppStore
  mode?: 'deep' | 'shallow'
}

export function renderWithProviders(
  ui: React.ReactElement,
  {
    preloadedState = {},
    // Automatically create a store instance if no store was passed in
    store = configureStore({ reducer: { user: userReducer }, preloadedState }),
    mode = 'deep',
    ...renderOptions
  }: ExtendedRenderOptions = {}
) {
  function Wrapper({ children }: PropsWithChildren<{}>): JSX.Element {
    return <Provider store={store}>{children}</Provider>
  }

  let renderOutput;
  if (mode === 'shallow') {
    renderOutput = {
      container: new ShallowRenderer(ui, { Wrapper })
        .getRenderOutput(),
    };
  } else {
    renderOutput = render(ui, { wrapper: Wrapper, ...renderOptions });
  }
  // Return an object with the store and all of RTL's query functions
  return { store, ...renderOutput }
} Here is an example of how you can use it in your tests: it('should match snapshot', () => {
   expect(shallowRender(<MyComponent />)).toMatchSnapshot();
});

it('should match snapshot with Redux', () => {
   const {container} = renderWithProviders(<MyComponent />, {mode: 'shallow'});
   expect(container).toMatchSnapshot();
}); Conclusion In conclusion, migrating away from Enzyme to React Testing Library can bring numerous benefits to your React application’s testing process. React Testing Library focuses on testing the behavior of a component from the user’s perspective, making the tests more robust, readable, and easier to maintain. However, it’s important to keep in mind that React Testing Library operates with the real DOM, and can produce large snapshots, which should be kept small and focused. Originally published here on February 4, 2023.

Understanding Snapshot Testing in the React Testing Library

There has been a high tide wave in the increment of fantasy sports app lovers all over the world. can be seen as a perfect partner for a sports lover who wants to get involved in the sports in any which way. Fantasy sports app So, what exactly is a fantasy sports app? Fantasy sports should be described as more of an online game under which participants assemble virtual or more of an imaginary team of the professional players that are actually playing in sports match at that time or around that time. The teams created by the users perform on the basis of actual performance given by the selected players in the virtual team. These performances are converted to points that are totalled on the basis of points roster designed by each and every specific fantasy team’s creator. This point system is not that tough to be understood in the manual form by the person who looks after the league and coordinates it overall. Points of a particular match can also be calculated using computer systems that keep an eye on actual up and down of a professional match. In a specific fantasy sports, team owners trade, draft and select players in the real sports. How is Fantasy Sports Market growing significantly? Fantasy sports app might have started as a fun activity among a group of friends but its sparkling popularity has made it an overnight success all across the globe. This year around 56.8 million people in the U.S. and Canada will be playing fantasy sports, according to the Fantasy Sports Trade Association. This is said to be a 37% increase from a year ago after increasing just 16% over the previous three years combined. As far as actual expenditures are concerned, the Fantasy Sports Trade Association estimated that 32 million Americans spend $467 per person or about $15 billion in total playing. Around 11 billion was said to flow toward football. Ad revenues associated with fantasy hosting sites are not counted in the above figure. It can be said that there would be only a few numbers of traditional players that play fantasy sports on a daily basis. Fantasy sports is said to be around €23 billion industry in the United States with around 57 million fantasy sports players in the US and Canada. But Eilers Research shows that every day the game will produce around €2.3 billion in entry fees this year and carry on growing 41% annually and in that way reaching a mammoth €12.8 billion in 2020. Fantasy Sports on a rise in Indian subcontinent With India being an economy on the upward rise, fantasy sports on kabbadi, cricket and football are said to have gained more than expected pace with the help of ever-growing technology. So with this, it can be stated that India is growing with each passing day and in coming days, With around 500 million expected users of the internet in 2017 out of which 400 million accessing internet via mobile phones, India is a market of opportunity for fantasy sports operators. There are said to be around 7 million players in india that plays fantasy sports on a regular basis. These numbers include a variety of sports like hockey, kabbadi, cricket along with football. Regarding percentage, the growth rate can be estimated at around 30–50% per year. Numbers concerned with it predict that the country can easily predict itself to reach the figure of around 50 million enthusiasts in the coming three years. With all the factors combined that include growth of technology, availability of high quality, better functioning android and iOS phones, fantasy sports market is going to grow at a rapid rate, make no doubt about it and with such stats, it can be said that it’s only going to create a pool of opportunities in different sections of fantasy sports and sports companies around the world are working continuously to dedicated to different sports and demography. develop fantasy sports mobile application Learn How to develop a Fantasy Sports Mobile Application Top Fantasy Sports App Developers let’s find about the top app developers in the arena of fantasy sports. Octal IT solution :- This leading software development company was established in the year 2007. Since then, they have developed over 1,100 mobile and web apps for over 700 clients from all across the globe. With a well-gelled team of more than 150 seasoned professionals, they provide clients with the best innovative solutions from their well-established development centres and also through onsite work environments. With high quality and affordable solutions, this company has earned themselves notable associations in the form of technology leaders like NASSCOM, Microsoft, Amazon Web Services, STPI, Acquia, D&B and many others. They are also praised and taken a note of by hundreds of clients on Clutch, GoodFirms, AppFutura, AppLancer, Appdexa and Extract, being among Top 10 Mobile App Developers on these platforms on a consistent basis. They are a renowned name in fantasy sports world as they are related to , fantasy sports software, fantasy games website development, daily fantasy sports web development, fantasy football development and many more related areas. Fantasy sports mobile application Arkasoftwares.com :- Arkasoftware is one of the leading names when it comes to fantasy sports mobile app and software development solutions. Founded in 2010 and with an experienced team of 100+ seasoned professional, the company has been continuously working in multiple technologies and catered more than 400 clients across the globe. Arka Softwares provides high quality and cost-effective mobile app solutions. With a well-gelled team of experienced developers and designers, they have earned a renowned name in the arena. The company is well admired by various prestigious research firms such as Clutch, Extract, Goodfirms, Appdexa, Skilled and Appfutura. fantasy sports app development Their seasoned subject experts and developers are well versed about the fantasy sports domain. Arka Softwares is one-stop solutions for your entire fantasy sports app & mobile app related requirement, Right from customized fantasy mobile apps to integrating cryptocurrency in the fantasy app, they have covered everything that a fantasy app required. Mobiwebtech.com Mobiwebtech.com Mobiweb technologies is another professional and one of the most trustworthy fantasy sports website development company that is known for providing fully customized, vigorous, responsive, remarkable, intense fantasy sports software and fantasy sports development arsenal. They have a team of highly-skilled and experienced professionals who can develop any kind of sports related websites and because of such great expertise they know what it goes into to build a high functioning sports website. As there is a new wave in the market of fantasy sports there is quite a healthy competition which in turns asks you to be better with each passing day and keeping this in mind, they are always working in their new skills and methods that will put them a step ahead of their competitors. Visvero.com :- Visvero is one of the most professional fantasy sports website development company that gives almost all types of fantasy sports solutions to all of their clients present across the globe. They have a well-gelled team of developers that has quite an experience in giving ideas and solutions in the app development arena for multiple games and sports. They are known for giving customized, responsive, robust and quite remarkable fantasy sports apps and websites. They have delivered quite a few fantasy sports apps and websites so they are quite aware of the process and efforts that go into it. They are a reliable app development company that works on three related aspects of a successful website development and that are a deadline, quality and discipline. Today there is a lot of competition in the fantasy sports market so in order to stay in the competition they rely on these aspects. SportsInteractive.net :- Mumbai-based Sportz Interactive has been driving the sports business forward. Founded in 2002, the company offers products like fantasy gaming, sports mobile app and services like live score, news, statistic, and players record data. They have also started providing users engagement features with the launch of analytics and other broadcast solutions.  The company has the record database for all major sports like Cricket, football, Formula One, Moto GP, Olympic Games which other sports organization may not have. Additionally, the clients of the Sportz Interactive include Star Sports, Yahoo, NDTV, ESPNcricinfo, Pro Kabaddi, Delhi Daredevils, Wisden India, Sony Six, Web18, Indian Super League, Fairfax Media, and International Cricket Council etc. sports-focused solutions company Vinfotech.com :- They are the latest type of product development organization which came out a creative idea of design thinking and have their eye on great level of user engagement. They know what is required to build a successful digital experience in the ever increasing noisy world, providing solutions that customers stick to and keep coming back. They are setting a trend by creating, out of box fantasy sports solutions in sectors other than sports, on a consistent basis. Their is one of a kind and has helped quite a few brands in industries that of politics, movies, music, stocks. They build fascinating apps for their clients’ sales team or their employees, for teenagers and senior citizens, for an amateur community or a particular group of experts. fantasy sports app development Codiant.com :- This company was established in 2010 and headquartered in the US. They have all the necessary solutions for your development needs. They build everything ranging from custom web application development and mobile apps to smooth website development along with e-commerce web development. To deliver the top of the world user experience is one of their basic strengths. They have a team full of experts that develops fantasy sports software solutions that contain a long list of sports and games such as Cricket, Football, Basketball, Hockey, Soccer, Baseball, Rugby and many others. Their expertise lies in fantasy sports app development, sports league website development, every day and season-long fantasy sports web development, sports betting software development, white label fantasy sports software development, fantasy football website and mobile app development. Krify.com Krify is a trustworthy and reliable fantasy sports app and website development company that provides to its clients exactly what they are thinking of. They have a modern development technique that allows them to nurture and create custom responsive Web Design that goes compatible with desktop, mobile and tablet. Their team of experts is always on the toes to serve to the demands of clients who are in search of their responsive sites to be developed. Let’s Nurture : Let’sNurture can be deemed as a global leader in the field of providing fantasy sports website design and mobile app development services across the globe. They have a highly skilled team that develops and design a fantasy sports app for leagues, teams, and the fantasy sports sector. Their innovative features can be integrated into fantasy sports app development. They are a renowned block-chain app development company and they help to build up a dispread platform in order to look after transactions for one’s fantasy sports business model. Dreamco Design : Dream co design is a highly professional sports app design company which can be trusted. They have been providing top notch mobile solutions for over a decade now. They work with data providers, teams, leagues, fantasy sports operators, athletes and more. Every mobile device to develop is custom and supported on both android and iOS mobile phones. They also design, develop and integrate sports data feeds for most of the big named companies. Blueyellow Media : They can create, design and run a cost-effective fantasy game for a sporting association, sporting event or sporting brand. They collaborate with companies and brands in order to build branded fantasy sports websites for events that of Football World Cup, the Lions Rugby Union tour and Rugby World Cup. They on your order build you a fully customized, mobile optimised, fully hosted website with a proper overall look to lighten up your brand. They build games for quite a number of sports that includes cricket, football, rugby, basketball, handball, and lacrosse. Algoworks Algoworks is an IT service provider company that also takes pride in developing sports websites and apps and is recognized across the globe as technology experts with roots in Sunnyvale, Noida and California. They provide services in important areas of enterprise content management solutions (CMS), enterprise mobile app development, customer relationship management (CRM) and software product engineering (SPE). So this was the list of top s that will help you out with your exact requirements. If you planning to enter into the world of ever growing fantasy then go have a detailed look at the outlook of these giants and go with the one that matches your level of appetite. fantasy sports app and software development companie

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