According to the mocha documentation, it is recommended to avoid using arrow functions.
Does this same recommendation apply to Jasmine? I could not find any information on this topic in the Jasmine documentation.
According to the mocha documentation, it is recommended to avoid using arrow functions.
Does this same recommendation apply to Jasmine? I could not find any information on this topic in the Jasmine documentation.
Don't miss out on this incredibly interesting article:
Here is a quote to ponder:
The groundbreaking approach
When running tests (and their beforeEach/afterEach hooks), jasmine assigns an empty object as the receiver of each function by default. This object, known as userContext in Jasmine's source code, can have properties added to it and is reset at the end of each test. To address our challenges, we shifted towards assigning variables to this object rather than declaring them within describe blocks and then assigning them values. Therefore, our original code transformed into something like this:
describe('views.Card', function() { 'use strict'; beforeEach(function() { this.model = {}; this.view = new CardView(this.model); }); describe('.render', function() { beforeEach(function() { this.model.title = 'An Article'; this.view.render(); }); it('creates a "cardTitle" h3 element set to the model\'s title', function() { expect(this.view.$el.find('.cardTitle')).toContainText(this.model.title); });
So, what does this mean? Should arrow functions be used with jasmine?
The answer is - continue using arrow functions in your code, except for this particular combination.
// could be arrow
describe("ListModel -", () =>
{
// local context description
interface IMyTestContext
{
items?: Heroe[];
...
}
// could be arrow
describe("Test items ", () =>
{
// NOT AN ARROW - benefit from Jasmine context passed as 'this'
beforeEach(function()
{
var ctx: IMyTestContext = this.TestContext = {};
// TODO do some defaults with context
...
});
// NOT AN ARROW - benefit from Jasmine context passed as 'this'
it("should ...", function()
{
var ctx: IMyTestContext = this.TestContext;
// TODO ... test expectations
...
Hence, beforeEach()
and it()
should NOT use arrows to make use of the Jasmine context accessible via this
We can also implement a global beforeEach()
call
import * as something from "...";
beforeEach(function()
{
this.TestContext = {};
});
Now, the context is readily available to us without having to recreate it:
describe("Track Changed items ", () =>
{
// NOT AN ARROW - benefit from Jasmine context passed as 'this'
beforeEach(function()
{ // created by global beforeEach above
var ctx: IMyTestContext = this.TestContext;// = {};
Indeed, it's truly remarkable that if a test runner detects a global
beforeEach()
... it will execute it before every test... isn't that awesome?
Currently utilizing typescript and encountered an error in the chrome console: Error found in event handler for (unknown): TypeError: Unable to access property 'command' as it is undefined at chrome-extension://somethingsomethingsometh ...
All languages had a question like this except for JavaScript. I am trying to determine, based on the variable "day," whether it represents today, tomorrow, or any other day. ...
A troublesome block of imports has surfaced, as shown in this image: https://i.sstatic.net/lRwK5.png Below is my current configuration in tsconfig.json : { "compilerOptions": { "target": "es5" /* Specify ECMAScript targ ...
I am encountering an issue while using Parcel for the first time. When I execute npx parcel .\app\index.html, I receive the following error: Error: Module not found './artifacts/index.win32-ia32-msvc.node' Require stack: - C:\Users ...
I'm currently experiencing an issue with setting breakpoints in Chrome using VSCode, especially when working with TypeScript and Browserify. Oddly enough, if I open Chrome separately and manually refresh the page, the source maps load correctly and I ...
I am currently working on a custom ToggleButton that changes its text based on certain state changes. However, I am facing an issue where the width of the button abruptly grows when the text changes. How can I smoothly transition this change in width? Bel ...
My useForm hook is designed to take an object and return several useful functions back, including that object as a state. However, due to TypeScript limitations, the specific type from the initial object cannot be returned because useForm accepts dynamic o ...
Check out my code snippet: export class voiceRecognition { constructor() { } public startVoiceRecognition() { const recognition = new webkitSpeechRecognition(); recognition.continuous = false; recognition.interimresults = false; recogn ...
There seems to be a missing @NgModule and @Directive declarations in an NPM module, even though they exist in the source code on Github. This is causing an issue with importing a directive for databinding from an HTML attribute. I am attempting to utilize ...
I'm facing an issue with my Angular2 application while utilizing the router.navigateByUrl method. Within my component, there is a function named goToRoute, structured as follows: router.goToRoute(route:string, event?:Event):void { if (event) ...
I'm curious - when rewriting an application from AngularJS to Angular 2+, do you need to be familiar with both, or is knowing just Angular 2+ sufficient? ...
Is there a way to apply CSS styles to a specific step (Angular material stepper) when hovering over it? I have attempted to set the styles on the elements .mat-step-header and mat-step, as well as applying a custom CSS class, but so far nothing has seeme ...
I'm in need of two radio buttons to choose between two options. Here's the code I'm using: <md-radio-button [value]=true [(ngModel)]="carSelected" name="carOption">Car</md-radio-button> <md-radio-button [value]=false [(ngMode ...
On my HTML page, I have a badge component that shows the number of unread messages. Here is the HTML code: <button class="font" mat-menu-item routerLink="/message"> <mat-icon>notifications</mat-icon> <span [matBadgeHidden]="newM ...
I have a dynamic dashboard of cards that I created using the ng generate @angular/material:material-dashboard command. The cards in the dashboard are structured like this: <div class="grid-container"> <h1 class="mat-h1">Dashboard</h1> ...
I'm currently working with a list of checkboxes in my HTML code: <div class="col-sm-12" *ngIf="ControllerModel"> <div *ngFor="let controller of ControllerModel" class="panel col-md-6 col-lg-6 col-xs-6"> <div class="panel-heading" ...
How can I extract and display the ID and title of the Hero object below? The structure of the Hero interface is based on a Firebase JSON response. hero.component.ts import {Component, Input} from 'angular2/core'; import {Hero} from '../mod ...
I am currently learning Ionic v2 and I am using document.addEventListener, but I am encountering errors as shown below: > [11:10:21] ionic-app-scripts 0.0.47 [11:10:21] build dev started ... [11:10:21] clean started ... [11:10:21] clean finished in ...
Currently, I am working on a basic eCommerce Proof of Concept using react and TypeScript. Unfortunately, I am facing an issue where I am unable to pass props to a product detail page or access the match containing the params. This is how my Routes pages a ...
I am dealing with a class setup as follows: export class Car{ color=''; topSpeed=0; wheels = 4; } Within my Firestore database, there exists a document titled "car" with values: color:red topSpeed:230 (note that the 'wheels&a ...