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?
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