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How to use ESLint with Jest

Taming Your Tests Using ES Lint with Jest for Cleaner More Reliable Code Testing is an essential part of any software development project Jest a popular Java Sc

2 min read 07-10-2024 32
How to use ESLint with Jest
How to use ESLint with Jest

How do I deal with localStorage in jest tests?

Mastering local Storage in Jest Tests A Comprehensive Guide Jest is a popular Java Script testing framework but when it comes to testing code that interacts wit

3 min read 07-10-2024 21
How do I deal with localStorage in jest tests?
How do I deal with localStorage in jest tests?

React Jest Testing onSubmit

Testing on Submit in React Components with Jest A Comprehensive Guide Problem Testing how a React component responds to a form submission using on Submit can se

3 min read 07-10-2024 35
React Jest Testing onSubmit
React Jest Testing onSubmit

Does Jest reset the JSDOM document after every suite or test?

Does Jest Reset the JSDOM Document After Every Suite or Test When testing your Java Script code with Jest you re often working within a simulated browser enviro

2 min read 07-10-2024 49
Does Jest reset the JSDOM document after every suite or test?
Does Jest reset the JSDOM document after every suite or test?

Jest run async function ONCE before all tests

Running Async Functions Once Before All Tests with Jest Testing asynchronous code in Java Script can be tricky especially when you need to set up data or resour

2 min read 07-10-2024 43
Jest run async function ONCE before all tests
Jest run async function ONCE before all tests

How to add custom message to Jest expect?

Adding Custom Messages to Jest Expectations Making Your Tests More Descriptive When writing tests clear and informative feedback is crucial Jests expect functio

2 min read 07-10-2024 47
How to add custom message to Jest expect?
How to add custom message to Jest expect?

Jest mock global variable's method

Mocking Global Variables in Jest A Guide to Controlling External Dependencies Testing your code is crucial for ensuring its stability and reliability However wh

2 min read 06-10-2024 54
Jest mock global variable's method
Jest mock global variable's method

Message "Async callback was not invoked within the 5000 ms timeout specified by jest.setTimeout"

Jest Timeout Error Async callback was not invoked within the 5000 ms timeout specified by jest set Timeout Understanding the Problem Have you encountered the fr

2 min read 06-10-2024 51
Message "Async callback was not invoked within the 5000 ms timeout specified by jest.setTimeout"
Message "Async callback was not invoked within the 5000 ms timeout specified by jest.setTimeout"

Jest transformIgnorePatterns not working

Jests transform Ignore Patterns Why Its Not Working and How to Fix It Jest the popular Java Script testing framework offers powerful features to streamline your

3 min read 06-10-2024 58
Jest transformIgnorePatterns not working
Jest transformIgnorePatterns not working

Jest gives `Cannot find module` when importing components with absolute paths

Jests Cannot find module Error Navigating Absolute Paths in Component Imports Problem You re trying to import components in your Jest tests using absolute paths

2 min read 06-10-2024 41
Jest gives `Cannot find module` when importing components with absolute paths
Jest gives `Cannot find module` when importing components with absolute paths

jest projects different setupfiles for each project not working

Jest Setup Files Why One Size Doesnt Fit All and How to Fix It Problem You re working on a multi project setup in Jest and you want to use different setup files

2 min read 06-10-2024 47
jest projects different setupfiles for each project not working
jest projects different setupfiles for each project not working

Timeout - Async callback was not invoked within the 5000ms timeout specified by jest.setTimeout

Jest Timeout Errors Unraveling the Async Callback Not Invoked Mystery Encountering a Timeout Async callback was not invoked within the 5000ms timeout specified

3 min read 06-10-2024 44
Timeout - Async callback was not invoked within the 5000ms timeout specified by jest.setTimeout
Timeout - Async callback was not invoked within the 5000ms timeout specified by jest.setTimeout

Jest watch with code coverage not working

Debugging Jest Watch with Code Coverage A Comprehensive Guide Are you trying to run Jest in watch mode and generate code coverage reports but finding that the c

2 min read 06-10-2024 49
Jest watch with code coverage not working
Jest watch with code coverage not working

Testing custom hook: Invariant Violation: could not find react-redux context value; please ensure the component is wrapped in a <Provider>

Unraveling the Invariant Violation could not find react redux context value Error Have you encountered the dreaded Invariant Violation could not find react redu

2 min read 06-10-2024 39
Testing custom hook: Invariant Violation: could not find react-redux context value; please ensure the component is wrapped in a <Provider>
Testing custom hook: Invariant Violation: could not find react-redux context value; please ensure the component is wrapped in a <Provider>

Mocking cross-fetch

Mastering Mocking Simulating Network Requests with cross fetch Testing code that interacts with external APIs can be tricky You dont want to rely on live networ

2 min read 06-10-2024 40
Mocking cross-fetch
Mocking cross-fetch

Jest throws TypeError: (0 , _module.myFunction) is not a function, testing exported functions (non default) with Jest

Unmasking the Jest Mystery Type Error 0 module my Function is not a function Have you ever encountered the frustrating Type Error 0 module my Function is not a

2 min read 06-10-2024 41
Jest throws TypeError: (0 , _module.myFunction) is not a function, testing exported functions (non default) with Jest
Jest throws TypeError: (0 , _module.myFunction) is not a function, testing exported functions (non default) with Jest

Jest mocking: TypeError: axios.get.mockResolvedValue is not a function

Mastering Jest Mocking Troubleshooting Type Error axios get mock Resolved Value is not a function Mocking is a vital technique in unit testing allowing us to is

2 min read 06-10-2024 49
Jest mocking: TypeError: axios.get.mockResolvedValue is not a function
Jest mocking: TypeError: axios.get.mockResolvedValue is not a function

Typeorm Jest mocking

Mocking Type ORM Repositories with Jest A Practical Guide Type ORM is a powerful ORM for Node js but testing interactions with your database can be tricky Mocki

2 min read 05-10-2024 52
Typeorm Jest mocking
Typeorm Jest mocking

Jest TypeError: Cannot read property of null

Jest Type Error Cannot read property of null The Null Pointer of Java Script Testing Have you ever encountered the dreaded Type Error Cannot read property of nu

2 min read 05-10-2024 47
Jest TypeError: Cannot read property of null
Jest TypeError: Cannot read property of null

Use jest's expect.extend() with TypeScript scoped to a single test file

Extending Jest Expectations with Type Script A File Scoped Approach Jests expect extend functionality allows you to customize expectations making your tests mor

2 min read 05-10-2024 50
Use jest's expect.extend() with TypeScript scoped to a single test file
Use jest's expect.extend() with TypeScript scoped to a single test file

How can I increase the test time out value in jest?

Boosting Jests Patience Extending Test Timeouts for Complex Scenarios Are your Jest tests hitting the timeout limit before they can complete Frustrating isnt it

2 min read 05-10-2024 42
How can I increase the test time out value in jest?
How can I increase the test time out value in jest?

getAllByRole - TestingLibraryElementError: Unable to find an accessible element with the role "option"

get All By Role option Error Troubleshooting Common Testing Library Pitfalls When working with React Testing Library encountering the error Testing Library Elem

3 min read 05-10-2024 51
getAllByRole - TestingLibraryElementError: Unable to find an accessible element with the role "option"
getAllByRole - TestingLibraryElementError: Unable to find an accessible element with the role "option"

How to test that <Navigate /> will navigate app to correct component

Testing Navigation in React with Navigate A Practical Guide Navigating between components is a fundamental aspect of React applications The Navigate component i

2 min read 05-10-2024 41
How to test that <Navigate /> will navigate app to correct component
How to test that <Navigate /> will navigate app to correct component

React Testing Library - fireEvent doesn't change input value

React Testing Library Why fire Event Doesnt Always Change Input Values Testing user interactions in your React application is crucial and React Testing Library

2 min read 05-10-2024 38
React Testing Library - fireEvent doesn't change input value
React Testing Library - fireEvent doesn't change input value

jest supertest with express-session

Testing Express Sessions with Jest and Supertest A Guide Testing your applications session management is crucial to ensure a seamless user experience This artic

2 min read 05-10-2024 53
jest supertest with express-session
jest supertest with express-session