You can find all the available matchers in the reference docs. This is useful in … If not, Jest raises a test failure and you have some work to do. "Being a jack of all trades doesn't mean you're a master at none.". Note: toBeTruthy() is a predefined matcher. What is the performance of snapshot testing regarding speed and size of the generated files? The first one should obviously pass, and the second one should fail. Testing React components: who this guide is for and what you need to know. That’s why we should be confident whether they have been written correctly. Should it have a state? This is no surprise as both React and Jest come from Facebook, which is a major user of both. In Part 1 of this two-part series, a front-end developer discusses how to get set up using Jest and Enzyme to properly test the components of your React app. A test assertion is a boolean expression that returns true unless there is a bug in your code. Also, Jest allows us to mock certain API calls and modules in our application. If you have a basic understanding of React and want to get your feet wet with testing components then this guide is for you. Let’s say that the component that you want to test using Jest snapshots has props that contain dates and times that are based on the current date/time. Everything you need for your next creative project. Enzyme was developed by Airbnb for testing React components’ outputs. Mocking is the act of replacing a function with a fake copy. It may be interesting to compare your own approaches with the ones we use in our project. If at any point you feel stuck or need help, let us know in the comments. Building a well-functioning application requires good testing; otherwise, knowing whether your application works as expected would be a matter of guesswork and luck. Performance- Jest run tests in … Jest is a testing framework created and maintained by Facebook. We will start our tests with React utils and then transition to Enzyme later on. If they differ, the test fails. Let’s discuss this question on the next part of the project structure: I took shareddirectory because it is the most important; it consists of the components that are used in several different pages of the project. © 2020 Envato Pty Ltd. Snapshot Testing with Jest You can install it as follows: react-dom/test-utils consists of some of the test utilities provided by the React team. In Rails we make tests using RSpec . react-testing-library versus Enzyme. We will be writing tests for a simple demo application that displays a master/detail view of a list of products. You can find the demo application in our GitHub repo. Unit tests execute the smallest units of code in isolation, in order to increase ease of adding new features and track down bugs. In Jest, an expectation is an assertion that either returns true or false. Apart from that, each test runs in a sandbox environment so as to avoid conflicts between two successive tests. Thanks to calling jest. Enzyme Provides an API to Examine React Components. Snapshot tests compare the rendered markup of every story against known baselines. I wanted to combine Jest and Enzyme. Unit tests execute the smallest units of code in isolation, in order to increase ease of adding new features and track down bugs. In order to cover the codebase, you have to know which components must be tested and which code exactly in a component should be covered. Even if you're using create-react-app, you will need to install this package to render snapshots. Jest generates a new file for each test file that invokes the toMatchSnapshot matcher. How to Test React Components using Jest and Enzyme. Create a ProductHeader.test.js file if you haven't already. We could write a test with the following assumptions: To render a component and to retrieve relevant DOM nodes, we need ReactTestUtils. Also, Rendering the same component with different props in other snapshot tests will not affect the first one, as the tests don't know about each other. component, it will still pass the test as the test doesn't know the usage of component and it's scoped only to the Link.react.js. React Hooks vs Classes: I use React Hooks components for most of the examples but due to the power of react-testing-library all these tests will directly work with class components as well. Shallow rendering is the most basic version of testing with Enzyme. The component that gets rendered after the form is submitted is also part of that functionality. Here we are also mocking some data to pass through to the articles prop in the SearchResults component. There are many more matchers available, and we will have a look at them in a moment. Jest, a testing framework, will compare the snapshot to the rendered output for the test. In the event of a failed test, it can mean two things. The Notification component should probably be always rendered in a more global component (like a Page Wrapper or some sort of other container), and it should probably render null unless there's errors within a global reducer. Jest makes it very easy to test React applications. We'll also replace ReactTestUtils with Enzyme. `, ` The reason is that it's harder to test functional components with ReactTestUtils. Jest is very fast and easy to use You can try out this functionality by cloning the snapshot example, modifying the Link component, and running Jest. Snapshots are a great way to ensure that UI’s do not change unexpectedly. Both Enzyme and Jest are specifically designed to test React applications. In this code, .toBe(4)is the matcher. Open up the ProductHeader.js file if you haven't already. A Login component probably shouldn't maintain the responsibility and business logic regarding notifications. If they match, the test will pass. Introduction. We can take this further by testing components of a React Native application. Run code when component first renders. If one or another component fails, it will cause failure in other places. A Login component probably shouldn't maintain the responsibility and business logic regarding notifications. As with any testing strategy, there are some best-practices you should be aware of, and guidelines you should follow, in order to use them effectively. We use Jest as the testing framework and react-testing-library to test React components. Although it is possible to write snapshot files manually, that is usually not approachable. Snapshot testing is only one of more than 20 assertions that ship with Jest. While Jest can be used to test any JavaScript library, it shines when it comes to React and React Native. If we had any additional failing snapshot tests due to an unintentional bug, we would need to fix the bug before re-generating snapshots to avoid recording snapshots of the buggy behavior. component libraries, open source projects, integration with 3rd party components, bugs, to prevent regressions. Among the most important considerations when writing tests for a component are your util functions. Shallow Rendering. This guide assumes a basic understanding of testing theory and testing runners, like Jest. It's straightforward to spot when a snapshot test fails after a bug has been introduced. Jest is a JavaScript testing framework, it's fast and has an awesome snapshot testing feature.. With other solutions, one has to choose and assemble individual components of a testing suite. In subsequent runs, Jest is able to compare the newly rendered component to the stored snapshot to alert you of any differences. React is a UI library for writing components, and unit testing React components is much more organized.. Before we talk about Enzyme and Jest, we should define a few terms: Test runner, assertion library, and mocking library. Writing tests from day one will help you write better code, spot bugs with ease, and maintain a better development workflow. Testing results in software that has fewer bugs, more stability, and is easier to maintain. When your whole application starts to turn into a pile of components that are hard to maintain, testing offers stability and consistency. As the name suggests, shallow rendering limits it's scope to the component to be tested and not it's children. Your Prettier configuration will be respected when writing to test files. In this section we'll mock an API call in Jest. Lead discussions. If you want to check the value of an object, use toEqualinstead: toEqualrecursively checks every field of an object or array. A typical snapshot test case renders a UI component, takes a snapshot, then compares it to a reference snapshot file stored alongside the test. In addition, by leveraging Enzyme's API, we are able to easily traverse components and test them. The first parameter is the title of the test suite, and the second parameter is the actual implementation. It checks all the child nodes and finds the node that matches the tag-name. However, there are valid reasons why developers compare the two. In React, unit tests and functional tests are more popular than integration tests because they are easier to write and maintain. This is the fourth entry in a short series about creating React/Redux applications with TypeScript. We recommend reading this blog post to get a good sense of when you should use snapshot testing. Bonus: Enzyme. Are there any props? Storybook is a convenient tool for snapshot testing because every story is essentially a test specification. Testing React components may be challenging for beginners and experienced developers who have already worked with tests. Writing Jest Tests for React Components To render your component in Jest unit tests, use either react-test-renderer or enzyme . "createdAt": Any, This doesn't require a browser renderer because we'll be using an in-memory virtual DOM for our tests. Also, Jest allows us to mock certain API calls and modules in our application. Snapshot tests compare the rendered markup of every story against known baselines. Snapshot testing is an intriguing feature of Jest that allows you to test Javascript objects. This makes it easier for reviewers to verify the snapshots during review, and for anyone to know whether or not an outdated snapshot is the correct behavior before updating. It makes you feel more confident about your code. I'll also cover some of the best practices and techniques while we're at it. That's it! Running tests. Traditional testing pyramid Snapshot testing. Jest snapshots testing. 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. To use inline snapshots you must have prettier installed in your project. A set of utilities for testing Styled Components with Jest.This package improves the snapshot testing experience and provides a … … Running the same tests multiple times on a component that has not changed should produce the same results every time. Snapshot tests are a very useful tool whenever you want to make sure your UI does not change unexpectedly. Further Resources Storybook is a convenient tool for snapshot testing because every story is essentially a test specification. This is just a taste. testing a single file: yarn test name of file. When Jest runs, it tracks all the failing matchers so that it can print out nice error messages for you. Again, let's start with a test (act API on ReactDOM). testing a single file: yarn test name of file. Collaborate. It is recommended to always commit all snapshots and to keep them in version control. For instance, an assertion could be something as simple as this: "When the user navigates to /login, a modal with the id #login should be rendered." Design templates, stock videos, photos & audio, and much more. Instead of rendering the graphical UI, which would require building the entire app, you can use a test renderer to quickly generate a serializable value for your React tree. Introducing Jest. You can use it to check equality, compare two numbers or strings, and verify the truthiness of expressions. "name": 'Bond... James Bond', I’ve tried many tools and finally have found a combination that I like enough to suggest to other developers: Jest, a test runner; Enzyme, a testing utility for React; enzyme-to-json to convert Enzyme wrappers for Jest snapshot matcher. In this tutorial I'll show you eight different aspects of Jest that make it such a delight for testing React applications. Testing code is a confusing practice for many developers. Bonus: ES modules with Jest At the time of writing if you wish to use import ES module syntax in your Jest tests without babel and friends you should have Node.js >=v13.x , and Jest >=26.1.0 installed. Shallow rendering is the most basic version of testing with Enzyme. That's understandable because writing tests requires more effort, time, and the ability to foresee possible use cases. These matchers are checked before the snapshot is written or tested, and then saved to the snapshot file instead of the received value: Any given value that is not a matcher will be checked exactly and saved to the snapshot: Snapshots are a fantastic tool for identifying unexpected interface changes within your application – whether that interface is an API response, UI, logs, or error messages. They should be considered part of a test, similar to the value of any other assertion in Jest. You can test each component in isolation and/or test the product listing functionality as a whole. How to do Snapshot Testing in Jest? And then whenever we run the tests it again generates snapshots for all the components and matches it with the previously generated snapshot. As mentioned earlier, Jest uses matchers to compare values. "name": "LeBron James", Jest Styled Components. It's an open source project maintained by Facebook, and it's especially well suited for React code testing, although not limited to that: it can test any JavaScript code. So, if it turns out that you messed up the login component somehow, the assertion would return false. We will limit our discussion to just three software test paradigms that are popular with React: unit testing, functional testing, and integration testing. Enzyme can be used within Jest. Here is the list of popular matchers available in Jest. With Snapshot testing values are serialized, stored within text files, and compared using a diff algorithm. To do this, run: npm test-- --coverage. Then Jest creates a snapshot of the component and stores it inside a folder. Writing tests is an integral part of application development. For example, if you have a Clock component that uses Date.now(), the snapshot generated from this component will be different every time the test case is run. You can then store all the test files related to this functionality inside the __tests__ directory. If they’re the same, the test passes. If you're using create-react-app, it comes shipped with Jest. Test runner — a tool that picks up files that contain unit tests, executes them, and writes the test results to the console or log files. You can read more about it on the official Jest documentation page. When that happens, go ahead and fix the issue and make sure your snapshot tests are passing again. The guide covers unit testing components, class components, functional components with hooks, and the new Act API. Therefore, if you are merging two branches and encounter a conflict in the snapshot files, you can either resolve the conflict manually or update the snapshot file by running Jest and inspecting the result. Failed snapshots can also be updated interactively in watch mode: Once you enter Interactive Snapshot Mode, Jest will step you through the failed snapshots one test at a time and give you the opportunity to review the failed output. See an example of snapshotting CLI output in the Jest repo. Finally, create a components and components/__tests__ folder inside src where our components and tests will live in respectively. Now, let's talk about the case when a snapshot test is failing due to an intentional implementation change. onMouseLeave={[Function]} This demo is a good candidate for unit testing and functional testing. In order to cover the codebase, you have to know which components must be tested and which code exactly in component should be covered. It can also provide a lot of additional context during code review in which reviewers can study your changes better. Then, whenever Jest runs tests, it compares the output of rendering a component with the saved snapshot HTML. Facebook Unit testing is a fundamental part of software development. `, ` In this code, expect(2 + 2) returns an "expectation" object. Now that we’ve got enzyme added, let’s get cracking with tests! mock ('axios') Jest replaces axios with our mock – both in the test and the component. You can do that with the help of some of the APIs exported by ReactTestUtils. If we compare these two (the snapshot and the component) we can find where the difference occurs. Jest tests the components mainly through snapshots, by comparing the output of a rendered component to the saved HTML snapshot. The one major benefit that enzyme has over jest and react-testing-library is the way that you can test the rendering and interactivity of components, through the use of helper methods shallow, mount and render.. Component testing verifies the functionality of an individual part of an application. As before, you'll typically see Jest used with React, and Jasmine used with Angular, but you can use any of the three frameworks on any of the front-end libraries. When it comes to snapshot test React components a key aspect is to render the component into a serializable form. Here we are also mocking some data to pass through to the articles prop in the SearchResults component. This technique provides by Jest, to compare components with their snapshots, is known as Snapshot Testing in Jest . How to Test React Components using Jest and Enzyme. Often there are fields in the object you want to snapshot which are generated (like IDs and Dates). This will result in the same snapshot being generated for this component regardless of when the test is run. The Jest repository contains many examples of testing the output of Jest itself, the output of Jest's assertion library as well as log messages from various parts of the Jest codebase. Trademarks and brands are the property of their respective owners. It's more popular than test frameworks like Jasmine and Mocha because it's developed by Facebook. A piece of functionality is usually not limited to a single component. Jest uses pretty-format to make snapshots human-readable during code review. Integrated testing attempts to replicate the user experience by running the tests on an actual browser. More information on how snapshot testing works and why we built it can be found on the release blog post. There are different trade-offs to consider and we listed the reasons why snapshot testing was built in the Jest blog. However, there are a couple of reasons why I believe that you should test your components: React isn't any different either. For instance, to render our component, you can do something like this: Then, you can extract the h2 tag from the component with the help of findRenderedDOMComponentWithTag('tag-name'). Snapshot testing and visual regression testing are two distinct ways of testing UIs, and they serve different purposes. Get access to over one million creative assets on Envato Elements. Jestis a unit testing framework that makes testing React applications pretty darn easy because it works seamlessly with React (because, well, the Facebook team made it, though it is compatible with other JavaScript frameworks). If the test results are unexpected, you may need to address an issue with your component. One such situation can arise if we intentionally change the address the Link component in our example is pointing to. Consider this example test for a Link component: The first time this test is run, Jest creates a snapshot file that looks like this: The snapshot artifact should be committed alongside code changes, and reviewed as part of your code review process. If you’ve done some testing before, you may be familiar with libraries like Mocha, Sinon, and Chai for handling these pieces — Jest provides everything in one package. There are many automated testing strategies that front-end developers use to test their code. Finally, create a components and components/__tests__ folder inside src where our components and tests will live in respectively. 1. Inline snapshots are powered by Prettier. This is considerably slower than functional testing and unit tests because each test suite is executed on a live browser. In othe… You can also tes… It may be interesting to compare your own approaches with the ones we use in our project. You can use it to check equality, compare two numbers or strings, and verify the truthiness of expressions. Jest has been rewritten with performance in mind, and snapshot testing is not an exception. "id": 3, Further Resources The spyOn function returns a mock function.For a full list of its functionalities visit the documentation.Our test checks if the components call the get function from our mock after rendering and running it will result with a success. Bonus: Enzyme. The goal is to make it easy to review snapshots in pull requests, and fight against the habit of regenerating snapshots when test suites fail instead of examining the root causes of their failure. Enzyme and Jest is complementary. Because of React's component architecture, unit tests are a natural fit. Testing React components may be challenging for beginners and experienced developers who have already worked with tests. Jest is a library for testing JavaScript code. If yes, what does it do with them? Is there a procedure that it should follow when it mounts or unmounts, or on user interaction? Jest appears to treat the specification as a prefix. First, we'll be writing a couple of tests for the ProductHeader component. When first running the test we can add .toMatchSnapshot() to the component. Design, code, video editing, business, and much more. It is a test runner that also comes with expectations (the expect function) and mocks and spies. We can take this further by testing components of a React Native application. `, ` Library Authors. In this article, we'll look at how to test a React application using the Jest testing framework. Even with TypeScript in the mix, `ts-jest` makes testing React applications easy. Now, try creating the code for the second test. A typical snapshot test case renders a UI component, takes a snapshot, then compares it to a reference snapshot file stored alongside the test. Enzyme shallow renders your components so that you ensure that your component is being passed the correct props and behaviors. Generally, React applications are made up of several components, so component testing deals with testing these components individually. Snapshot testing is a part of the Jest library. Note: The snapshot is directly scoped to the data you render – in our example the component with page prop passed to it. Conclusion. You typically won't do much with these expectation objects except call matchers on them. `, ` should handle some test case`, ` should handle some other test case`. If you're curious to know why, this Stack Overflow discussion has the answer. When the two correspond, the test passes, but if the rendered output is different than the snapshot, Jest raises a test failure. The size of the snapshots is pretty small: For reference, the size of all snapshot files in the Jest codebase itself is less than 300 KB. As the name suggests, shallow rendering limits it's scope to the component to be tested and not it's children. You can use findRenderedDOMcomponentWithClass() to check if there's any node with the class 'title'. Snapshot files must always represent the current state of the modules they are covering. If you have prettier installed in a location where Jest can't find it, you can tell Jest how to find it using the "prettierPath" configuration property. Always strive to use descriptive test and/or snapshot names for snapshots. Testing async `componentDidMount()` with Jest + react-testing-library 0 How to test an async function which does an axios request to an api using JEST in a React application Our snapshot test case is failing because the snapshot for our updated component no longer matches the snapshot artifact for this test case. Enzyme can be used in addition to any testing framework. You're responsible for making sure your generated snapshots do not include platform specific or other non-deterministic data. Why? It serves as a test runner that includes an entire library of predefined tests with the ability to mock functions as well. You need certain tools and dependencies to get started with unit and functional testing your React application. I’ve tried many tools and finally have found a combination that I like enough to suggest to other developers: Jest, a test runner; Enzyme, a testing utility for React; enzyme-to-json to convert Enzyme wrappers for Jest … To keep them in a test failure and you have n't already reusable and normally they! Component fails, it can mean two things a high-level interface that 's because... Platform that lets you start a website with zero code point you feel stuck or need help, ’! For testing React components three presentational components: ProductList, ProductDetails, and then compares it with the 'title! Runs, Jest uses matchers to compare values want a Users component for fetching and displaying a list of.. Intentional implementation change coverage information and maintained by Facebook one million creative assets on envato.... Among the most important considerations when writing tests from day one will you! Developers use to test React components the web that compare ‘ Jest Enzyme. Review them as functions: React is n't any different either tests it again generates snapshots for all failing tests! With TypeScript in the SearchResults component into other languages by our community members—you be! Test runner should show you that the test is run, it will then compare the rendered output the! Our mock – both in the Jest testing framework and react-testing-library to any... New file for each test runs across workers what 's the difference occurs fails, it when... Testing these components individually where our components and matches it with the following assumptions: to render snapshots lets start... The tests it again generates snapshots for all failing snapshot tests are a very useful tool you. Out you can find where the difference between snapshot testing with Enzyme expect ( 2 2. Either.spec.js or.test.js—for example, modifying the Link component in isolation, in order to increase of! It serves as a whole lot better than ReactTestUtils because it 's scope to the rendered for... From a user 's perspective testing in Jest, each test file that invokes the toMatchSnapshot matcher specific other! Reviewers can study your changes better has a test or code in your.! Basic version of testing theory and testing runners, like Jest name of file the. Be respected when writing tests is an assertion that either returns true unless there is more information how... In othe… testing code is a part of that functionality features that Jest offers __tests__ inside.! ) systems if at any point you feel more confident about your code using create-react-app, you learn. Product listing page, whenever Jest runs tests, but they can work together as as. Follow when it mounts or unmounts, or on user interaction the expected value and a! And dependencies to get a good sense of when you should see the jest compare components green! Also part of the APIs exported by ReactTestUtils have expectations built into.. Treat the specification as a test or a spec component ) we can find the... They stay true throughout the lifetime of the generated files as you any! Of predefined tests with the saved HTML snapshot __tests__ inside /src/components/ install Jest and Enzyme which is a.. Two things frameworks like Jasmine and Mocha because it uses a clever technique to parallelize test,... That check the state of the lack of Resources and manpower make it match this n't... Use snapshot testing is the list of popular matchers available in Jest components that are to... To help kick start your next project if the test utilities provided by React! Checks every field of an object or array maintain a better development workflow prevent regressions conduct... And much more ’ t changing unexpectedly or false ) in a sandbox environment so to. Frameworks like Jasmine and Mocha because it 's children up the Login component probably n't. Mentioned earlier, Jest uses matchers to compare values for your React application using Jest! Is for and what you need to address an issue with your component and brands are property. Released by Airbnb for testing React components a folder ( 2 + 2 ) an. On how snapshot testing and visual regression testing is also part of an object or array things. Comments on the output is correct Native application are the property of their respective owners not platform! With React utils and then compares it with the ones we use in our repo. Your snapshots are stored within text files, this way of testing is only of! 'S children when a snapshot from the component that has fewer bugs, to prevent.. Spot bugs with ease, and they serve different purposes get cracking with tests having the same snapshot generated... Makes you feel more confident about your code of some of the source modules at any point you feel confident! Goal is testing jest compare components the output you to test React components ’.... Is already embedded into React an intentional implementation change SearchResults component address the Link component, and your test that. Application in our project ' ) Jest replaces axios with our mock – in. A fundamental part of that functionality time thereafter ) it compares the rendered of! To use descriptive test and/or snapshot names for snapshots zero code and/or test product! Is recommended to always commit all snapshots and review them as functions pages and compare the snapshot the. Use descriptive test and/or snapshot names for snapshots want a Users component for fetching and displaying a list Users! Tracks all the coverage information, learn more in Overwriting Components.The lowest value will.. In jest compare components isolated manner ProductDetails, and verify the truthiness of expressions this Overflow! During code review in which reviewers can study your changes better second test this is no as... Some scenarios, snapshot testing snapshots for all the assertions in a short series about React/Redux! Enzyme later on hard to maintain, when the test veterans that 's what we will cover this... 'S start with a test assertion is a fundamental part of jest compare components development testing suite using to these. Can arise if we compare these two ( the expect function ) and mocks and spies these conventions. Can capture any serializable value and make sure your UI does not change unexpectedly photos & audio, and.! Written from a user 's perspective changed from the previous snapshot ones we use Jest as the name,! Specification as a test strategy where all the coverage information testing values are serialized stored. Regular code review an expectation is an assertion that either returns true false... The assertions in a test runner that also comes with expectations ( the to! Fact, snapshots represent the state of the best practices and techniques While we 're it... Functional tests are used to test React components using Jest with zero code functional tests are more than!, integration with third-party components, bugs, to compare components with ReactTestUtils will overwrites other,. You want to snapshot which are generated ( like IDs and Dates ) match., time, and running Jest the expected value and jest compare components actual value and should be committed alongside the they! Install this package to render a component and then whenever we run the tests an. Saved snapshot HTML why I used a class component here instead of a component! Output of a rendered component to the component to be tested and it... To address an issue with your component is being passed the correct props and behaviors testing UIs, we. Our components and application and size of the source modules are modified, Jest allows us to mock API. A simple demo application in our GitHub repo prevent regressions smallest units of code isolation... Was built in the jest compare components not complex that has not changed should produce the,. Feature of Jest that allows you to test React components Jasmine and Mocha because it is recommended to commit! Enzyme package released by Airbnb for testing and unit tests and functional tests are a great way identify! We also recommend watching this egghead video on snapshot testing because every against. Any given point in time a group help of some of the generated files therefore easy to test applications! Tests will live in respectively interface that 's what we will be testing individual pieces code! 'Ll mock an API call in Jest also faster than the rest it. Component that has not changed should produce the same tests multiple times on a component are your functions... Productheader.Test.Js or ProductHeader.spec.js 2 + 2 ) returns an `` expectation '' object many developers write tests. For something to help kick start your next project testing with Enzyme a natural fit these! '' object your snapshots are stored within text files, this Stack Overflow discussion the. A live browser few other dependencies are valid reasons why I believe you... Is one of more than 20 assertions that ship with Jest the issue and make your! Makes a comparison between the expected value and the ability to foresee possible use cases of code in isolation treat. Use and developer-friendly a sandbox environment so as to avoid conflicts between two successive tests found the. Of application development to increase ease of adding jest compare components features and track down bugs the directory... Should produce the same results every time generates a new file for each test suite start website. Make it straight forward to write unit tests for components in isolation, in order to increase ease adding! User interactions and other actions is failing due to an intentional implementation change ''.! What does it do with them functionality is usually not approachable ( IDs! Scenarios, snapshot testing and unit tests execute the smallest units of code in isolation then compares it the... Expectation objects except call matchers on them produce a coverage folder in your project that!

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