Issue How to unit test (Jest here) custom validator, which has FormGroup? I’ve seen this question, but it’s about FormControl. The function to be tested. import { FormGroup } from ‘@angular/forms’; /** * @description Validate if passwords are different. *
Continue readingTag: jestjs
Angular w/Jest: `verify()` vs.`expectOne()`?
Issue I have a failing test that I’m not sure how to fix. The error messages I’m getting from Jest appear to be contradictory, and the problem relates to the behavior of two Angular HttpTestingController methods: verify() and expectOne(). The
Continue readingAngular: after moving from Karma to Jest, Error "Unrecognized CLI Parameters"
Issue I updated my project from Angular 6.4 to Angular 7.1 and now running the script: ng test app-name –coverage gives me the error: ● Unrecognized CLI Parameters: Following options were not recognized: [“main”, “polyfills”, “tsConfig”] CLI Options Documentation: https://jestjs.io/docs/en/cli.html
Continue readingIs it possible to activate coverage in jest but not printed it in console?
Issue Coming from Karma I like to keep a browser tab opened to check the code coverage of my tests from time to time. Is possible with a jest to generate the coverage folder without jest printing the coverage in
Continue readingJest and Serialize-ts Count find type for field:
Issue I am facing an issue while running testing using jest in my angular application after upgrading jest to v9 while using serilize-ts The error is: Count find type for field: amount 4 | export class Price { 5 |
Continue readingHow to make jest only run testing for the files in src folder Angular?
Issue I am learning how to setup jest testing in angular. I follow the instruction of jest-preset-angular. I can successfully make the jest run in angular, but my app also has two submodules in the root, which jest gives a
Continue readingHow to make jest only run testing for the files in src folder Angular?
Issue I am learning how to setup jest testing in angular. I follow the instruction of jest-preset-angular. I can successfully make the jest run in angular, but my app also has two submodules in the root, which jest gives a
Continue readingAngular 13 + jest + Angular library not working
Issue I’m trying to use jest in an Angular 13 project for testing. I use jest-preset-angular with @angular-builders/jest. I use ngx-pipes, which is a library that is not compiled for Angular 13. It works fine during normal Angular build. But
Continue readingSometimes when I update the snapshots I got an Attribute __ngContext__
Issue Sometimes when I update the snapshots I got an Attribute ngContext and for fix this problem I’ve to clean and install my node_modules to "fix" this issue. I’ve to do this every time that I need to update a
Continue readingInvalid or unexpected token while Jest migration
Issue I’m migrating my project from Karma-Jasmine to Jest. But I’m getting the following error. It seems I’m missing some configuration. The error points out to constructor(@Inject(‘env’) env: IEnvironment, line from the service which is imported in the app.component.ts file.
Continue readingCreate mocked service (object) with one method returning a value
Issue In an Angular environment, how can I very easily create in a Jest environment a mocked service for a service object returning a specific value? This could be via Jest of ng-mocks, etc. An oversimplified example: // beforeEach: //
Continue readingMocking Observable to throw error in Jest
Issue I am trying to mock the PUT call of HttpClient of Angular to throw error. I am using throwError for it. It isn’t working. What should I change to make it throw the error and call the handleError method?
Continue readinghow to mock service dependency when testing service?
Issue im have to test a service that uses other service. i created faked service. i configured it to return false value and other fake service to return true value. how can i make a test that uses the fake
Continue readingAngular Jest testing `Cannot find name 'By'.`
Issue I am using Jest.JS with Angular. When I try to test the directive, I get the error: Cannot find name ‘By’. src/app/directives/error-highlighter.directive.spec.ts:33:46 – error TS2304: Cannot find name ‘By’. 33 inputEl = fixture.debugElement.query(By.css(‘input’)); What is required to install things
Continue readingDirective unit testing fails
Issue I am using jest.js for testing with my angular app. here is the directive I use in html: <textarea errorHighlighter formControlName=”Url” name=”Url” cols=”50″ rows=”5″ placeholder=”Enter Page URL” (ngModelChange)=”pageUrlChanges($event)”></textarea> here is my directive.ts file: import { Directive, ElementRef, SimpleChanges, HostListener,
Continue readingangular 8 jest test `toHaveBeenCalledWith` fails, how to test api url calls?
Issue In my test spec, I would like to insure 2 stuffs. 1. dummy data maching with model and get response. 2. find the `api` called with correct url. I am trying those, but getting error as: SubsystemServiceService › get
Continue readingAngular ngrx test with jest throw error ` console.error node_modules/jsdom/lib/jsdom/virtual-console.js:29`
Issue I do the testing for my ngrx/store with jestjs. i got the testing passing result. eventhough getting an error like: console.error node_modules/jsdom/lib/jsdom/virtual-console.js:29 Error: Cross origin http://localhost forbidden at dispatchError (C:\722333\USD\Project\AOS.UI\NG-USD\node_modules\jsdom\lib\jsdom\living\xhr-utils.js:60:19) at Object.validCORSHeaders (C:\722333\USD\Project\AOS.UI\NG-USD\node_modules\jsdom\lib\jsdom\living\xhr-utils.js:72:5) at receiveResponse (C:\722333\USD\Project\AOS.UI\NG-USD\node_modules\jsdom\lib\jsdom\living\xmlhttprequest.js:842:21) at Request.<anonymous> (C:\722333\USD\Project\AOS.UI\NG-USD\node_modules\jsdom\lib\jsdom\living\xmlhttprequest.js:677:38)
Continue readingIssue with @input element failing default test case
Issue relatively new to testing framework, facing below issue where I’m running ‘npm run test’ on a newly created spec.ts file with no extra test cases added I’m facing issue that the map function used upon @input element is undefined
Continue readingNWL NX Angular Jest tests are reporting "unable to find describe" errors
Issue Does anyone know why my Angular Jest Tests are reporting: error TS2593: Cannot find name ‘describe’. ?? I have an NWL NX Workspace running an Angular App & Multiple Libs. The tests in all the Libs are running fine.
Continue readingUse SpyOn on provider that has string value
Issue I have a class that I am trying to test. The class has a service Injected in as such: constructor(private actions$: Actions, @Inject(‘NotificationHandlerService’) private notificationService: INotificationHandlerService) {} In the spec.ts I just provided it using a value as I
Continue readingIssue with deep testing components in Angular and accessing html with debugElement
Issue I have a hierarchy of components in my angular app which is as follows: BookmarkContainer has the following child components: BookmarksListComponent CreateBookmarkComponent BookmarksListComponent has a ngFor of BookmarkItemComponent I am trying to access the template of BookmarkItemComponent from the
Continue readingProblems to run any Jest tests with jQuery and jQuery UI
Issue So I have an Open Source library named Angular-Slickgrid which doesn’t have tests yet and I’m trying to use Jest with it but it’s really hard to get going with it. The library is a wrapper of and old
Continue readingJest – Async callback was not invoked within the 5000 ms timeout specified by jest.setTimeout.Error
Issue I can see there are lots of questions about this on SO but none of them answer my problem. I have the following test it(‘will poll until there are no subscribers’, () => { const polls: string[] = [];
Continue readingJest – Async callback was not invoked within the 5000 ms timeout specified by jest.setTimeout.Error
Issue I can see there are lots of questions about this on SO but none of them answer my problem. I have the following test it(‘will poll until there are no subscribers’, () => { const polls: string[] = [];
Continue readingTesting Angular component extending an abstract class
Issue I have this setup for a number of components: @Directive() export abstract class BaseComponent implements OnInit { @Select(PortalState.portal) public portalState: Observable<PortalModel>; public portal: PortalModel; protected ngUnsubscribe: Subject<void> = new Subject(); constructor( protected someService: SomeService, protected route: ActivatedRoute ){ }
Continue readingHow to cover Jasmine unit test for RxJS subject in angular
Issue I am very new Jasmine unit test cases. My scenario may be easy but I am not sure how to cover test case for ngInit for below class. Can someone help me, export class Component1 implements OnInit { details$:
Continue readingTesting and anchor tag click inside a ng-container embbeded in a ng-switch
Issue I´m really new about testing in angular and I, couldn´t have found a solution for this problematic. Im trying to do a test over a method that is called once an anchor tag is clicked. This anchor tag is
Continue readingPrevent "test/expect/etc is not defined" errors when using Jest
Issue Facebook’s Jest testing framework is easy to get started with, but the documentation overlooks an annoying aspect: test statements will be highlighted as errors by any editor that tries to warn of undefined symbols, because test, expect, and all
Continue readingUnit testing AngularJS Directives with Jest
Issue I feel I am missing something crucial in this extremely simplified angular directive unit test: import * as angular from ‘angular’ import ‘angular-mocks’ const app = angular.module(‘my-app’, []) app.directive(‘myDirective’, () => ({ template: ‘this does not work either’, link:
Continue readingHow to use jest.mock after @types/jest is removed (^jest@24)
Issue I recently updated the @angular-builders/jest from 7 to 8. In the migration guide it states that I should remove @types/jest because it’s now comes with Jest v24. (I also updated my tsconfig) So far so good. But now my
Continue readingAfter upgrading to Angular 8 testing with Jest broken
Issue We recently upgraded our Angular version from 7 to 8 and have run into some problems when using Jest as our test runner. The goal is to get our build pipeline running again with our javascript tests. We are
Continue readingli tag with conditional always not visble in angular test with jest
Issue Good day developers . Im trying to test the show hide behaviour of a <li/> tag according to a specific variable. For that this <li/> tag has an *ngIf bound: <ul class="item" js-selector="tab-list"> <li class="item" js-selector="tab" *ngIf="isTabEnabled" … >
Continue readingAngular 9 new unit test error: "unsafe value used in a resource URL context"
Issue Since upgrading my Angular application from version 8 to version 9 I’ve got a new error appearing when I run my Jest unit test: unsafe value used in a resource URL context (see http://g.co/ng/security#xss) The component I am testing
Continue readingUsing environment variables in Node and Jest
Issue I have a NodeJS app. For a long time I’ve been using Mocha to run tests. I simply had a package.json like "dev": "node index –env=dev", "start": "node index", "test": "mocha ‘./test/**/*.spec’ –env=dev" Now I am switching to Jest
Continue readingJest instantiating empty objects instead of class instances
Issue I’m using ts-jest to test a JS/TS SDK/module. I’m running into a strange issue where a Jest test will run (no compile/import failures) but fail to correctly instantiate an object from the appropriate class. test("Should build unit", () =>
Continue readingHow to mock navigator.clipboard.writeText() in Jest?
Issue I have tried the following 4 options after looking at Jest issues and SO answers, but I am either getting TypeScript errors or runtime errors. I would really like to get option 1 (spyOn) working. // —— option 1
Continue readingJest: SVG require causes "SyntaxError: Unexpected token <"
Issue Not sure where to look for this error. Using Typescript with React, and Jest and Enzyme for unit testing. Package.json sample: “scripts”: { “start”: “node server.js”, “bundle”: “cross-env NODE_ENV=production webpack -p”, “test”: “jest” }, “jest”: { “transform”: { “^.+\\.tsx?$”:
Continue readingWhat is the simplest way to mock a fetch call that is only meant to run in the browser with jest?
Issue If I’m testing a function that makes a fetch call, and all the fetch calls I have in the project are only meant to run in the browser. Do I still need to have some package installed on node
Continue readingHow test request http with parameters with jest – angular
Issue I’m testing an angular service with Jest. I can to mock my httpClient, but I have a problem it is that I cannot test a url with a parameter (ex: “http://localhost:8080/api/feature/num?id=25663“). This my test code : describe(‘MyService’, () =>
Continue readingJest test functions on select statements in React JS
Issue I am new to testing in jest and I was wondering if I could receive some clarity on a matter I am having difficulty understanding. const getSelectField = () => <SelectField name={name} id={id} aria-label="test" value={value} options={options} />; describe(‘Select Field’,
Continue readingHow to mock useHistory hook in jest?
Issue I am using UseHistory hook in react router v5.1.2 with typescript? When running unit test, I have got issue. TypeError: Cannot read property ‘history’ of undefined. import { mount } from ‘enzyme’; import React from ‘react’; import {Action} from
Continue readingCannot find module 'babel-preset-env' from PATH Did you mean "@babel/env"?
Issue Jest cli suddently has stopped working, all test fails with: Cannot find module ‘babel-preset-env’ from ‘/PATH’ – Did you mean "@babel/env"? I’m sure it is some kind of incompatibility between a module which uses babel 6 and my project
Continue readingHow to mock AWS Cognito CognitoIdentityServiceProvider with Jest?
Issue I’m trying to write unit test where I need to mock response of method from cognito service – CognitoIdentityServiceProvider I have the following working code calling the adminInitiateAuth operation import * from AWS from ‘aws-sdk’ const cognito = new
Continue readingreactjs empty data when mocking axios.get with jestjs mock
Issue I am developing an application in react and for the first time I decided to implement tests. I started with the simpler components, which I still had trouble with, but now I would like to test more complex components,
Continue readingJest test fails with Unexpected token, expected ";"
Issue I have a Node project using Typescript and Jest. Currently I have this project structure With this tsconfig.json file “compilerOptions”: { “target”: “ES2017”, “module”: “commonjs”, “allowJs”: true, “outDir”: “dist”, “rootDir”: “src”, “strict”: true, “moduleResolution”: “node”, “esModuleInterop”: true } this
Continue readingJest test assertion, expect a nested object
Issue When I do the below expect in jest with native test expect(mockOnChange).toHaveBeenCalledWith({ order_type: expect.arrayContaining([‘1’]), number: ”, ouser_ids: expect.arrayContaining([‘user_id1’]), payment_type: expect.arrayContaining([‘2’]), start_date: old_Date, end_date: current_date, state: ‘all’, }); I’m getting the following error Object { "end_date": "2022/06/07", "number": "", –
Continue readingTest unable to run test cases exits with TypeError: Jest: a transform must export a `process` function
Issue { //tsconfig.base.json "compileOnSave": false, "compilerOptions": { "baseUrl": "./", "outDir": "./dist/out-tsc", "sourceMap": true, "declaration": false, "downlevelIteration": true, "experimentalDecorators": true, "module": "esnext", "moduleResolution": "node", "importHelpers": true, "target": "es2015", "typeRoots": ["node_modules/@types"], "lib": ["es2018", "dom"] }, "angularCompilerOptions": { "fullTemplateTypeCheck": true, "strictInjectionParameters": true }
Continue readingHow can I mock an ES6 module import using Jest?
Issue I want to test that one of my ES6 modules calls another ES6 module in a particular way. With Jasmine this is super easy — The application code: // myModule.js import dependency from ‘./dependency’; export default (x) => {
Continue readingHow to prevent redundant code in my jest e2e testing?
Issue I am just learning to build e2e tests with Jest and Supertest. Test background Some APIs are protected by Api Keys so I need to create them on the test before running these APIs. The problem is that I
Continue readingSonarQube coverage deviates of Jest coverage
Issue I’m having hard time to understand why SonarQube has different coverage results compared to Jest coverage. SQ coverage results Jest coverage My question is, why does the coverage deviate with a noticeable amount and how can you prevent this
Continue readingJest: I want to put test code under 'Project/test/' directory, but configuration error occured
Issue I want to put my test code under ‘Project/test/’ directory, not ‘Project/src/moduleName/’. So I changed jest configuration at package.json. rootDir "src" => "test" moduleNameMapper "^src/(.)$": "<rootDir>/$1" => "^src/(.)$": "src/$1" "jest": { "rootDir": "test", "moduleNameMapper": { "^src/(.*)$": "src/$1" }, "moduleFileExtensions":
Continue readingAxios mock: Received number of calls: 0
Issue I am trying to do a simple mock for my get All method.I’m getting this error: Expected number of calls: 1 Received number of calls: 0 following is my mock configurations. jest.mock("axios", () => { return { create: jest.fn(()
Continue readingHow to mock NODE_ENV in unit test using Jest
Issue I want to set NODE_ENV in one of the unit test but it’s always set to test so my tests fails. loggingService.ts … const getTransport = () => { if (process.env.NODE_ENV !== "production") { let console = new transports.Console({
Continue readingexpo app with testing react-native-testing-library and jest-native "has no exported member 'toHaveProp"
Issue I’m trying to use jest-native as extra matchers and i’m having an installation problem i think … I am on a react-native ts app with expo and here are my versions: expo:"~39.0.0" @testing-library/react-native version:"^7.1.0" jest-preset: ‘jest-expo’, react-native version:" 63.4
Continue readingTesting Mocked Fetch Api in Jest returns undefined
Issue I have a generic FetchService in React/TS like this: /* Generic Fetch Service */ const FetchService = { call: async (url:string) => { try { return await fetch(url) .then((res) => res.json()) .then((data) => { data.response}); } catch (e) {
Continue readingHow to get a Jest custom matcher working in typescript?
Issue I regularly have unit tests where I need to compare two moment objects. I’d us moment’s built-in function moment.isSame(moment) to compare them. However, this means my assertion will look like this: expect(moment1.isSame(moment2)).toBeTrue(); I didn’t quite like this, especially because
Continue readingJest called chain of imported dependencies of module
Issue When I created instance of Atom jest show error with piece of code that i haven’t invoced. I assume it connects with modules that have imported in class that I try to create. I begin to mock modules showed
Continue readingtsconfig problems with test and compiling
Issue This is my tsconfig.json { "compilerOptions": { "noImplicitAny": true, "declaration": false, "strict": true, "strictNullChecks": false, "target": "ES2019", "module": "commonjs", "resolveJsonModule": true, "allowJs": true, "checkJs": false, "outDir": "dist", "esModuleInterop": true, "inlineSourceMap": true, "rootDir": "./", "baseUrl": "./", "typeRoots": [ "./node_modules/@types" ],
Continue readingJest global teardown runs before tests finish?
Issue I’m trying to make sure my app gets properly destroyed after all my Jest tests have run, but I’m running into some very strange behaviour trying to use Jest’s global teardown config value. Here’s the situation: my app creates
Continue readingJest Spy not being called
Issue I am trying to run a test using the winston logger package. I want to spy on the createlogger function and assert that it is being called with the correct argument. Logger.test.ts import { describe, expect, it, jest, beforeEach,
Continue readingHow to stop Jest from hanging when testing WebSockets?
Issue I created an app in node.js which gives me a WebSocket interface using the ‘ws’ package from NPM on the server. Now I want to test this interface with Jest. The test runs successful but Jest does not exit
Continue readingJest/Rxjs – timeout when calling for subscription from a getter
Issue I have a service that updates an Rxjs Subject whenever a method in the service is called: @Injectable() export class AppAlertService implements IAppAlertService { private readonly _alertBehaviourSubject: Subject<IAlertConfiguration> = new Subject<IAlertConfiguration>(); public get alertConfiguration(): Observable<IAlertConfiguration> { return this._alertBehaviourSubject.asObservable(); }
Continue readingHow to resolve console error unhandled promise rejection when unit testing?
Issue I have a method that handles error codes: handleSignatureAppErrorCodes(code) { if (code === 10) { return this.handleError({ message: ‘Configuration error, contact administrator’, }); } else if (code === 11) { return this.handleError({ message: ‘ Certificate not available’ }); }
Continue readingUsing Jest with Angular 13 + Clarity
Issue i am currently attempting to upgrade an existing Angular app which uses VMware Clarity. I already managed to upgrade from 8.x to 10.x following the Angular update guidelines. However beyond that the jest configuration breaks, as the newer Clarity
Continue readingHow to test a http request function in a service with Angular and Jest
Issue I created a simple service returning a json object. getCountries() { return this.httpService.get(‘../../assets/countries.json’); } The test describe(‘TestServiceService’, () => { let service: TestServiceService; let httpController: HttpTestingController; beforeEach(() => { TestBed.configureTestingModule({ imports: [HttpClientTestingModule] }); httpController = TestBed.inject(HttpTestingController); service = TestBed.inject(TestServiceService);
Continue readingProperty 'toHaveStyle' does not exist on type 'JestMatchers<Element>'
Issue I have a Color Directive which set background-color to card. I dont understand how to testing it by Jest @Input(‘appColor’) public color: string; constructor( private element: ElementRef, private render: Renderer2, ) { } public ngAfterViewChecked(): void { this.setCategoryColor(); }
Continue readingAngular 8 and jest – File not found: jest-preset-angular/InlineHtmlStripStylesTransformer.js
Issue I just created angular application using the cli (v8 – last version from today). nothing special I done so far. (ng new ng-app). I use jest-schematic to add jest to my angular project. cd ng-app ng add @briebug/jest-schematic The
Continue readingWatch and rerun Jest JS tests
Issue The Jest documentation suggests using npm test to execute tests. Is there a way of watching your source and tests to rerun Jest tests automatically when relevant files have been changed? Solution Thanks to Erin Stanfill for pointing out,
Continue readingError while running Jest tests in @nrwl/nx workspace
Issue I recently started to convert my Angular apps and libs into an @nrwl/nx workspace. The apps are running fine, however when it comes to my Jest tests I get some strange errors. The workspace is a standard NX workspace
Continue readingAngular/Jest – Test that the subject has thrown error after setter is called
Issue I have a class that is responsible for setting the theme for my application. I’m trying to test that it throws an error if you give it a theme that it does not recognise. The code is shown below
Continue readinghow to create instance of class with jest
Issue I am a beginner in writing tests and in jest also. I want to test that this function to be called and return the success promise. I write a unit test for function using jest. The function gets like
Continue readingTesting with 'toHaveStyle' passes when expecting fail
Issue I’m learning about testing and react. I’m having a little trouble understanding why a test is passing when it should not: From App.js <button style={{backgroundColor: ‘gray’}}> Gray button </button> From App.test.js expect(colorButton).toHaveStyle( {backgroundColor: ‘gray’ }); // passes ok expect(colorButton).toHaveStyle(
Continue readingHow to test if a function set something to localStorage with Jest?
Issue I want to test a function that writes something to localStorage using Jest. The function in question is the following: const items: = [ { name: ‘Item One’, }, ]; export const init = () => { if (!localStorage.getItem(‘items’))
Continue readingHow to mock a specific method of a class whilst keeping the implementation of all other methods with jest when the class instance isn't accessible?
Issue Based on this question (How to mock instance methods of a class mocked with jest.mock?), how can a specific method be mocked whilst keeping the implementation of all other methods? There’s a similar question (Jest: How to mock one
Continue readingHow to mock AxiosInstance?
Issue I have axios with following HttpClient class export default class HttpClient { constructor(baseUrl: string) { const axiosInstance = axios.create({ validateStatus(status: number) { return status === 200 || status === 201; }, }); axiosInstance.interceptors.request.use((config) => { if (AuthUtil.getAuthHeader()) config.headers =
Continue readingJest – testing httpClient rejected promise
Issue I have an Nest.js application and I’m trying to test a method that has a simple httpClient request, but I can’t find a way to test the catch block from my code. async getUser(): Promise<any> { try { return
Continue readingProblem in the tsconfig.json file when trying to use Jest with Typescript
Issue The error message I am getting is: File ‘d:/Project/server/jest.config.ts’ is not under ‘rootDir’ ‘d:/Project/server/src’. ‘rootDir’ is expected to contain all source files. The file is in the program because: Matched by include pattern ‘**/*’ in ‘d:/Project/server/tsconfig.json’ My tsconfig.json file
Continue readingMock function not called and not resolving or returning mocked value in React jest API testing
Issue I am using jest to test the axios API calls. Mocking the API is not resolving or returning a value and mock function is not called. Here is my code for API call and testing. // import axios from
Continue readingHow to install typescript + jest with create-react-app?
Issue I want to install typescript and jest in a create-react-app-based app. I feel that since this is such a common installation choice there must be at least one "everything just works" set of configuration steps to follow. I initially
Continue readingHow to mock a constructor instantiated class instance using jest?
Issue Given a class Person that instantiates & uses another class Logger, how can the Logger‘s method be verified to be called when Person is instantiated in the example below? // Logger.ts export default class Logger { constructor() {} log(m:
Continue readingTesting using setTimeout(fn, 0). What this snippet of testing code does?
Issue This is a snippet from a unit test file that use jest. The parse function returns a Promise after the parse is completed… But I cannot understand the use of that boolean flag (completedAsyncDummyTask). it("parse is a promise that
Continue readingJest: function that should throw does not pass and test will fail
Issue I want to test a function A that calls multiple other functions inside it which can throw errors. Here is an abstraction of my code: // file A.ts const A = (args: any[]): boolean => { (() => {
Continue readingaws cdk 2.0 init app fails to build with prettier issues, which is from jest-snapshot
Issue node: v16.7.0 cdk: 2.0.0 (build 4b6ce31) package.json: "devDependencies": { "@types/jest": "^26.0.10", "@types/node": "10.17.27", "aws-cdk": "2.0.0", "jest": "^26.4.2", "ts-jest": "^26.2.0", "ts-node": "^9.0.0", "typescript": "^3.9.7" }, "dependencies": { "aws-cdk-lib": "2.0.0", "constructs": "^10.0.0", "source-map-support": "^0.5.16" } npm run build/watch stack trace: node_modules/@types/prettier/index.d.ts:41:54
Continue readingJest beforeAll vs beforeEach unexpected behaviour
Issue I have a quite simple test, basically I’m trying to mock i18next’s t function: import { t } from ‘i18next’; import { changeDocumentTitle } from ‘./utils’; jest.mock(‘i18next’); const tMock = (key: string): string => key; beforeAll(() => { (t
Continue readingHow to mock x-date-pickers from mui in jest?
Issue I added a DateTimePicker to my app which seems to work, however, I’m unable to mock the picker in my Jest tests. I keep getting the following error: Test suite failed to run TypeError: (0 , _material.generateUtilityClasses) is not
Continue readingJest won´t complete my async function for my api call function
Issue I´m working on a small app that uses an API. I want to make a test to see that the function works as intended. The function works, but in the test, the function will not complete and therefore fail.
Continue readingJest – mock a named class-export in typescript
Issue I have a node module which exports a few classes, one of which is Client, which I use to create a client (having a few APIs as methods). I’m trying to test my module which uses this node module
Continue readingJest – mock a named class-export in typescript
Issue I have a node module which exports a few classes, one of which is Client, which I use to create a client (having a few APIs as methods). I’m trying to test my module which uses this node module
Continue readingTesting if an event has been triggered in NestJS
Issue In the project we are building, there is a standard sequence in the workflow. Controller receives a request Then fires an event through @nestjs/event-emitter Event listener listens to it and executes some code depending on the event How can
Continue readingReact-scripts test: no traceback on exception
Issue I remake browser version of TacticToy game with React, and during unit-tests writing I’ve got a problem: there is no full traceback of a custom exception, only test function is highlighted: In the package.json file’s scripts section I have
Continue readingMock 'S3' feature of 'aws-sdk' (nodeJS and Jest)
Issue I need to test a file in charge of retrieving data from S3 through the ‘aws-sdk’ (nodeJs + Jest). The file is: const AWS = require(‘aws-sdk’); let S3 = null; const getS3 = async () => { if (S3
Continue readingNode v13 / Jest / ES6 — native support for modules without babel or esm
Issue Is it possible to test ES6 Modules with Jest without esm or babel? Since node v13 supports es6 natively have tried: //package.json { … “type”: “module” … } //__tests__/a.js import Foo from ‘../src/Foo.js’; $ npx jest Jest encountered an
Continue readingHow to disable Morgan (request logger) during unit test?
Issue I use Morgan (default express generator request logger), and I’m trying to disable it during unit testing. Currently I’m using the default configuration, which loads Morgan in app.js const logger = require(‘morgan’); … const app = express(); … app.use(logger(‘dev’));
Continue readingHow do I test a single file using Jest?
Issue I am able to test multiple files using Jest, but I cannot figure out how to test a single file. I have: Run npm install jest-cli –save-dev Updated package.json: `{ … "scripts": { "test": "jest" } … } Written
Continue readingHow to stop a commit if test coverage is below a certain percentage?
Issue I’m using Jest to test a NestJS application and I’m trying to create a git hook with husky that will not allow a commit if tests coverage are under 95%, I haven’t tried anything yet cause I really don’t
Continue readingJest: to check if a function is called by a specific instance of class in JavaScript/Typescript
Issue I am testing some express middlewares with jest. it("should throw 400 error if request.body.id is null", () => { const req = { body: { id: null } } as any; const res = {} as any; const next
Continue readingTypescript paths not resolving when running jest?
Issue Attempting to convert this project over to jest using these instructions. I have everything working except for the files that use the paths configuration: “paths”: { “@fs/*”: [“./src/*”], “@test/*”: [“./test/*”] } It looks as if when the tests are
Continue readingQuery a simple button with jest and
Issue I’m trying to test my component, so here it’s : import React from ‘react’; import { useNavigate } from ‘react-router-dom’; import ‘../styles/mainPageStyles.css’; const MainPage = (): React.ReactElement => { const navigate = useNavigate(); const handleBeginQuiz = () => {
Continue readingHow to test NestJs response interceptor
Issue I tried to follow this thread but it I keep getting an error. transform-response.interceptor.ts: import { Injectable, NestInterceptor, ExecutionContext, CallHandler } from ‘@nestjs/common’; import { Observable } from ‘rxjs’; import { map } from ‘rxjs/operators’; import { ApiResponseInterface }
Continue readingTest coverage: import statements not covered
Issue I’m writing tests with Jest for a Nest application in typescript. The problem is, I have uncovered import statements saying else path not taken" and "branch not covered". The uncovered imports vary across classes. Sometimes it is underlined seemingly
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