All Questions
Tagged with typescript jestjs
3,568
questions
0
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21
views
how to mock a third party library and assert its functions were called (or spyon) with jest?
I am working with ngrx and signalr, and writing a unit test for my ngrx effect responsible for building, starting and stopping the signalR hub.
this is my effect:
import {HubConnection, ...
- 341
0
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29
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Adding "test" target config to existing NX libraries
I am working on an application that uses https://nx.dev/ and https://angular.dev/ and is configured with https://jestjs.io/ to run unit tests.
I normally use this command to generate new Angular ...
- 60.1k
-1
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26
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How to mock my util DynamoDB GetItemCommand implementation?
I've got code that uses GetItemCommand to get data from my DynamoDb instance, however I'm not entirely sure how I go about testing my function that uses it.
I don't want to test the GetItemCommand ...
- 6,082
-2
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28
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What error is this: "Jest encountered an unexpected token"? It came from "isPortReachable" import of my code to be tested
Im trying to do Jest testing for all my domain/service/business logic of my web app.
One of the import was isPortReachable, and Conf, but apparently every file with this import would fail the test ...
- 7
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16
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NestJS & Jest: The presence of jest.config.ts causes "strange behavior" during build
I have a Nestjs service inside my monorepo project with the following structure:
/
- package.json
- packages/
- - frontend/
- - backend/
- - backend/package.json
backend is the nestjs service, ...
-1
votes
1
answer
34
views
What is "Argument of type <mock parameters> is not assignable to parameter of type 'never'" in Jest?
I took a bunch of examples online and ChatGPT code to do my testing. I ended up with some red squiggly lines under the parameters mockResolvedValue with the error:
Argument of type '{ email: string; }'...
- 7
-1
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answers
22
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How to properly unit test initialisation of pg-promise via jest.mock / jest.mocked methods?
Currently, I have setup my code as follows:
import pgPromise from "pg-promise";
const pgp = pgPromise();
export const createDBConnection = async () => {
const db = pgp({
...
0
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37
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ts-jest unable to process a file
I am new to jest and am trying to implement unit tests in a sharepoint framework solution. I am using ts-jest to process my typescript files and am currently struggling to get a self built package to ...
- 1
0
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19
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Jest has different behavior in watch mode
I'm writing a extension for chrome omnibox. And I'm using jest to write testing, but I found that the behavior of npx jest and npx jest --watchAll are different.
Detailly, npx jest works fine and it ...
- 111
-1
votes
1
answer
31
views
How to mock optional methods as undefined in Jest?
I am writing unit tests for a NestJS/Express server that uses the express-session package. It has an object with methods that might not always be defined. In my code I check for it to exist first, ...
- 33k
2
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answers
60
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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
0
votes
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answers
50
views
pg-mem with typeorm for in memory jest testing
i have a express app i am creating in typescript. I also am using typeorm as my orm for connecting to the database and actioning on it.
I already have jest unit tests but i also wanted to create ...
- 115
0
votes
1
answer
17
views
How to Mock TypeORM's Entity Manager Transaction for behavior assertion when Unit Testing in Jest?
Question
I am trying to write a unit test for a method that uses TypeORM's entity manager transaction. The method is defined as follows:
class MyRepository {
private readonly repository: Repository&...
- 11
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answers
26
views
Using Jest to mock an AWS S3 call results in Argument of type 'any' is not assignable to parameter of type 'never'
I'm having an issue with a test that tries to mock a an S3 call with Jest.
The module under test does something like this
import { S3Client, CopyObjectCommand } from "@aws-sdk/client-s3";
...
- 22.6k
0
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answers
35
views
How can I effectively isolate state in Jest?
I want to write my tests using GIVEN, WHEN, THEN. GIVEN sets the initial state (e.g. initializes instances), WHEN changes it (eg calls methods on those instances), THEN asserts the new state (e.g. ...
- 11