All Questions
Tagged with javascript jestjs
8,182
questions
0
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0
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12
views
Mock static method of object in react jest
I want to mock a static method defined outside a component.
Here is my component:
import Authenticate from '/api/Authenticate';
export default class MyComponent extends React.Component {
render() {
...
- 1
0
votes
0
answers
5
views
Jest - react-native-color-matrix-image-filters/dist/CMIFColorMatrixImageFilterNativeComponent.js: Could not find component config for native component
I have a React Native Android project and I just upgraded the react-native version from 0.72.3 to 0.74.3. After a fair amount of library upgrading, TS and Lint fixes, etc I was able to get my ...
- 5,546
-1
votes
0
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13
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Jest failed to parse a file. This happens e.g. when your code or its dependencies use non-standard JavaScript syntax,
This is the error i am getting:
Jest failed to parse a file. This happens e.g. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such ...
-3
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0
answers
37
views
JS - required lib returns a constructor - how to test? [closed]
There is this NPM lib: https://www.npmjs.com/package/clamscan
It is being used like this according to the docs:
const NodeClam = require('clamscan');
const ClamScan = new NodeClam().init(options);
...
- 7,432
0
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answers
19
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Angular component testing with Jest, Spectator and asynchronus operations
I was trying to figure it out by myself for last two days but I have no clue what I'm doing wrong. It has to be related somehow to asynchronus operations (probably selectors from ngrx) in my component,...
- 769
-1
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answers
10
views
Jest- not getting coverage for Object.key line
I have a function that takes in an object, manipulates it, checks that the manipulated object still contains data, then iterates through the object's keys using Object.keys / forEach and passes the ...
0
votes
0
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15
views
Create a file/folder during a test with Jest always fails
I have a file watcher that triggers a callback every time a file in a specific path is update.
I want to write a test to make sure this happens, so my approach is the following:
create a temporary ...
- 3,187
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votes
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answers
11
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How can i mock knex transaction
i have unit test for function sync in these code but i get error like below i cant mock the function knex.transaction() for trx. i have tried some another way but i usually get trx is not the fuction ...
-1
votes
2
answers
24
views
Jest react test : API call failed TypeError: Cannot read properties of undefined (reading 'json')
I am going to test the components below through the jest and react test library.
I want to test if the API is called normally when I press the button, So I made the API calling part mock.
However, ...
- 81
1
vote
1
answer
20
views
How can I mock prompt-sync module using jest
I have this method promptPlayer in the class Player which job is to return to the player the index of an empty slot. But inside the method I am running prompt from the prompt-sync module of JS. Cant ...
- 469
0
votes
0
answers
24
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Need to know jest dom setup in plain vanilla javascript
i created an todo app in vanilla javascript now i needed to test that using jest but the thing jest-environment is not working on that. i need proper procedure to setup get done
package.json
{
"...
- 34
0
votes
1
answer
31
views
Jest toHaveBeenCalled() doesn't work for me
I am mocking up some function:
export const natsWrapper = {
client: {
publish: jest
.fn()
.mockImplementation(
(subject: string, data: string, callback: () => void) =>...
0
votes
1
answer
52
views
Jest Unit test for nested function javascript
How do I write a unit test for nested functions? I tried to reach the reject value with the test below but the test is failing. The output of the failed message does say there is an error and the test ...
- 39
-1
votes
0
answers
18
views
Using the Spy in Jest on a ProductLookupClient in the test class always returns undefined
I created a service which returns a list of products given the productId, However, when I mock the value to be returned by the ProductLookupClient it always returns undefined in my test class using ...
- 630
2
votes
0
answers
60
views
Is there a way to verify order of HTTP calls?
I am using the Nock library for mocking HTTP calls, with Jest as the testing framework. I am loading mock calls from a json file. Tests work fine, but I want to make sure certain calls happen before ...
- 78.7k