Checking if a piece of software performs as expected is known as testing. This is frequently referred to as QA, or quality assurance, and tries to minimise the number of bugs that reach production.
Before sending code to production, we test software to find any mistakes, holes, or missing requirements and correct them.
Thorough testing increases the stability of our project, saves us time and money later on in bug-fixing, and increases the likelihood that our customer will be completely delighted with our product. A complete testing solution for the frontend is offered by Cypress and Jest.
With Cypress, an open source test-runner, you can run your projects in a robotic browser much like a user would. With Cypress, we can specify what the browser should do like as open a URL, click a button, finish and submit a form, etc and verify that each action is matched with the appropriate result.
What's nice about this is how much what was tested mirrors what the user would actually encounter. The user is the entire objective of software development, thus the more we can understand their perspective, the more likely we should be to find the most significant errors in our code.
"Time travel" is another amazing element of Cypress. We can see every test we've written on Cypress' automated browser, and we can just mouse over them to view a graphical representation of the outcome. Knowing what's breaking and when it's breaking is incredibly helpful.
Cypress is mostly used for end-to-end testing since it can quickly analyse entire features, despite the fact that it can also be used for unit and integration testing. Cypress may be used to test anything that runs in a browser, making it simple to integrate with React, Angular, Vue, and other frameworks. Contrary to Jest and React-Testing-Library, Cypress does not include create-react-app by default. However, we can quickly install it using NPM or your preferred package manager.
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Jest can be used in projects that employ other technologies such as Babel, TypeScript, Node.js, React, Angular, Vue.js, Svelte, and others. Jest may be installed using NPM just like any other library, and it needs very minimal initial configuration.
When creating React apps with create-react-app, Jest is already installed. Because it has many more built-in functionalities than merely running tests, which is not the case with all test runners, Jest is frequently referred to as a testing framework.
Jest is frequently referred to as a testing framework because it has many additional functions in addition to test execution, which is not true of all test runners.
Jest and Cypress are often used in the same codebase. The distinction between integration and unit testing might become a little hazy with component libraries like Vue and React. The fact that we may apply the same tools (Jest & Cypress) to both situations further adds to the confusion. I advise you to test "user stories," or, to put it another way, confirm that users can consistently carry out important actions.
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|Category||Categories covered are Integration Testing, End-to-End Testing, Unit Testing||It supports Unit Testing|
|Server-side||Cypress can test back-end behaviours using the cy.task() command, which offers a way to run Node code, despite the fact that it is neither a framework for broad automation nor one for unit testing your back-end services. As a result, you can perform tasks required for your tests outside of Cypress's purview.||Much like front-end testing, back-end server behaviour may also be tested with Jest.|
|Fixtures||For instance, the command "cy.fixture(filePath)" loads a fixed set of data from a file using Cypress's built-in fixtures capabilities.||Fixtures can be used, and Jest offers a number of helpful functions like beforeEach and afterEach. If you have tasks that you must perform repeatedly for numerous tests, use beforeAll and afterAll instead of setup, which should only be done once at the beginning of a file.|
|Group Fixtures||The 'cy.fixture' command in Cypress can be used to build group fixtures.||Jest enables fixtures for groups.|
|Mocks||With its built-in cy.stub() and cy.spy() functions, Cypress can stub and spy. It also automatically packages "lolex,", "sinon," and "sinon-chai," which all contribute to Cypress's mocking capabilities.||Jest makes it simple to fake any object outside the scope of your test by using a custom resolver for imports in your tests. With the powerful Mock Functions API and clear test syntax, you can spy on function calls by using mocked imports.|
|Grouping||Cypress allows you to arrange tests into configurations, but there is currently no method to execute the groups.||You are free to specify an unlimited number of test suites. Tests are grouped together using a describe block.|
We'll use both Cypress and Jest to help with our testing. These tools, in our opinion, work best together and will enable us to achieve adequate code coverage. Since we have found Cypress to be quite user-friendly, we will use it for our end-to-end testing. We will use Jest for our unit tests because we have observed how well-used it is in many larger organisations.
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Madhuri is a Senior Content Creator at MindMajix. She has written about a range of different topics on various technologies, which include, Splunk, Tensorflow, Selenium, and CEH. She spends most of her time researching on technology, and startups. Connect with her via LinkedIn and Twitter .
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