A Babel transpiler to assist with the conversion of ES6 to ES5 for the Jest testing framework.
A Babel plugin to assist ES6 to ES5 transpilation for the Jest testing framework.
Questions tagged [babel-jest]
607 questions
0
votes
1 answer
babel-jest to transform non .js|.jsx extensions
I have Customer.js.flow type file.
When I run jest, it fails with this error:
Customer.js.flow:1
({"Object.":function(module,exports,require,__dirname,__filename,global,jest){export type Customer = {
…
Mayas
- 1,434
- 5
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0
votes
1 answer
React Jest es6 (rest spread operator) babel configuration not working
I am try create app with react-tool-box. Also I try use Jest for testing,
but get this test fails. It look like es6 configuration problem for Jest.
● Test suite failed to…
Edgaras Karka
- 7,400
- 15
- 61
- 115
0
votes
1 answer
jest mock dependency generator function
I am having trouble mocking a simple dependency generator function.
//generatorFunction.js
export default ()=>({execute: (arg1)=>Promise.resolve(arg1)})
//actualFunction.js
import generate from 'generatorFunction'
export default…
l2silver
- 5
- 1
- 3
0
votes
1 answer
How to make pre-resolved promises continue the test syncronisely
If I have a bit of code that cause something to happen async but not as a root cause of doing something (can't wait for the callback), something that happens on loop (i.e. testing autosave) how would be the best way todo it.
Here is a failing tests…
Saspiron
- 180
- 1
- 10
0
votes
1 answer
What's the right way to use babel-jest?
Per the docs: https://github.com/facebook/jest#babel-integration
If you'd like to use Babel, it can easily be enabled: npm install --save-dev babel-jest babel-polyfill
So all you have to do is install those two packages and nothing else?…
Joseph Fraley
- 1,360
- 1
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- 26
0
votes
1 answer
React Jest: How to get the state of checkbox
I'm trying to find the checked status of a checkbox in a React component. This is my component:
class Checkboxes extends React.Component {
constructor() {
super();
console.log('Hello world!');
this.state = {
…
Dirty Penguin
- 4,212
- 9
- 45
- 69
-1
votes
1 answer
After I upgrade "jest-dom" to "react-router-dom", all my Test suite failed. And the error is related to the "Jest encountered an unexpected token"
I updated my React test package from "jest-dom": "^3.2.2" and "react-testing-library": "^7.0.0" to "@testing-library/jest-dom": "^5.16.5" and "@testing-library/react": "^14.0.0". But all the test suite failed and I got below error.
"Test suite…
bruce
- 21
- 3
-1
votes
1 answer
jest: unable to mock methods/hooks using `jest.spyOn`
I'm trying to mock the methods & hooks in a file and import those mock functions as I need them, in my test files.
useMyHook.jsx
const useMyHook = () => {
const [val, setVal] = useState(200)
return { val }
}
export { useMyHook…
javascript-wtf
- 21
- 3
-1
votes
1 answer
Mocking API calls with authorisation using JEST
I have an API call function that retrieves data from my back end to display. My API call as a header that is required for authorisation when retrieving the data. The session storage is set at login when the application is run.
My main code is…
Mehbenmeh
- 17
- 5
-1
votes
1 answer
How to fire a click event on a button with classname inside a div using JEST and React-testing-library?
I am creating a test case using JEST and RTL where I have to perform some action on button click event but I'm not able to fire a click event on that button.
My component looks like:-
const CustomButton = () => {
return (
Ankit Jaishwal
- 496
- 1
- 9
- 21
-1
votes
1 answer
Jest.fn().mockReturnValue returns undefined
Below mentioned mocked function when used in a file called useFirestore gives the following error: Cannot read property 'collection' of undefined.
firebase.js
import Firebase from 'firebase/app';
import 'firebase/storage';
import…
Debarshi Bhattacharjee
- 689
- 1
- 11
- 18
-1
votes
1 answer
Test for a component: How to access to a property of a tag with getByTestId
I'm doing a component test in react (My first) and I want to verify a number, when I pass it the value, it returns undefined and I remove the value to see what it returned and it was fine, find the element
import React, { useState } from…
Emocrat3
- 65
- 2
- 9
-1
votes
1 answer
Is this transpilation issue correctly filed against babel-jest?
I raised an issue https://github.com/facebook/jest/issues/11504 against the jest project, which I think is responsible for maintaining babel-jest. Transpilation totally fails after adding apparently harmless and error-free code.
However, there are a…
cefn
- 2,895
- 19
- 28
-1
votes
1 answer
React + Jest: Test suite failed to run
I am fixing some tests on our pre-existing project, and I ran into this error:
FAIL src/components/changelog/__test__/ChangeLogOverView.test.tsx
● Test suite failed to run
TypeError: Cannot create property '__packages__' on boolean 'true'
…
JMon
- 3,387
- 16
- 63
- 102
-1
votes
2 answers
Running test cases to test a function using Jest
I am trying to test few test cases for a function where it takes two parameters. these two parameters along with the result I have defined it in three different files and then exporting it. I am using Jest for the same, but it is throwing…
joy08
- 9,004
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- 73