Questions tagged [jestjs]
Jest is a JavaScript unit testing framework made by Facebook based on Jasmine and provides automated mock creation and a jsdom environment. It's often used for testing React components.
15,156
questions
0
votes
0answers
13 views
Jest-Native “SyntaxError: Cannot use import statement outside a module”
Trying to do some unit testing using https://github.com/callstack/react-native-testing-library + https://github.com/testing-library/jest-native, I have no problem testing plain javascript files, but I ...
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votes
0answers
10 views
Mocking react custom hook
I need to mock useLogin hook, bacause it contains logic that throws an error. Later i will test it in isolationю. UseLogin returns loading flag and login function that connecting new user to firebase.
...
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0answers
6 views
next-i18next Jest Testing with useTranslation
Testing libs...always fun. I am using next-i18next within my NextJS project. We are using the useTranslation hook with namespaces.
When I run my test there is a warning:
console.warn
react-i18next::...
0
votes
1answer
18 views
React component not setting state after mocking redux
Here is my test
const initialRootState = {
accounts: [mockAccounts],
isLoading: false
}
describe('Account Dashboard', () => {
let rootState = {
...initialRootState
}
const mockStore ...
0
votes
1answer
12 views
How can I write a unit test using jest, react, testing-library for this component?
I need to write unit tests using Jest and testing-library in a React typescript project. And how can I create an ID for my component ErrorModal to use in my test? I never wrote a test before!! Thank ...
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votes
0answers
11 views
getElementById returns 0 in (jest) testing, but works fine in browser
I've built my first app with create-react-app , and I'm trying to include a simple test.
Somehow the test always returns TypeError: Cannot read property 'classList' of null even though the code works ...
-1
votes
0answers
5 views
calling component.ngOnInit() throws error in Jest but works in Jasmine
I was writing unit test cases for my Angular application previously using Jasmine. Calling component.ngOnInit() in my test suite used to call the ngOnInit() method. But when I do the same in Jest, it ...
0
votes
0answers
11 views
How do I hook into Jest to write a Logging Plugin?
I'm looking to create a logging plugin for Jest. I'm hoping to create a log with all of the major events, catch and rethrow the errors, and make a nice log file of everything happening in a Jest test ...
0
votes
0answers
4 views
Jest test fails to run with ts-jest after deleting babelrc- Unexpected token on imported file
Similar issue: Jest fails to run .tsx files (CRA 2, enzyme)
I am converting js test files to ts files, and I use ts-jest. As I know, If I use ts-jest, I don't need babel anymore. But when I delete ....
-1
votes
0answers
13 views
react testing library test failing due to callback
Im trying to mock a callback function on react testing library in a next.js project, but my test fails as the callback is not being called
any tips in how to fix this? I have inserted the code for the ...
0
votes
0answers
4 views
FluentUI - suppress “The icon 'X' was used but not registered” warning
I'm writing a react app that uses fluentUI.
while working on the system everything is fine (ofc I'm calling initializeIcons() function). however, when I'm running my test using jest, I keep getting ...
0
votes
0answers
4 views
Snapshot fail on version attribute in html update
it('match snapshot on data load',() =>{
Createwrapper();
Expect(wrapper)
.toMatchSnapshot();
});
0
votes
1answer
17 views
How to mock a specific Node function with Jest
I have a module with two functions.
const exampleFunctionOne = () => { };
const exampleFunctionTwo = () => { };
In my test file I am mocking exampleFunctionOne as so:
let mockExampleFunctionOne ...
0
votes
0answers
15 views
How to test a method that closes an MatDialog using Jest
I have a method called downloadFile() which I want to test using Jest. I have a model for Attachment which is shown below:
export class Attachment{
name: string;
lastUpdateBy: string;
...
1
vote
0answers
37 views
is there a way to mock the the Promise.resolve in a function
So I tried to mock a jwt.verify function. below is the function itself and then the mock.
try {
const decodedJwt = new Promise((resolve, reject) => {
jwt.verify(
token,
...
