How do I use an array I've created within my Test file

Question

So I have created a js array for a list of postcodes. The array is as below in the code: -

//postcode.js file var postcode = [ "b28 8ND", "b49 6BD", "b28 0ST", "b31 4SU", "B92 9AH", ];

What I need to do is in my test randomly select a postcode for this js file to enter into a text field when running my automation tests. How do I go about doing this? An example would be much appreciated as I can't find much on the internet & I'm quite new to TestCafe & javascript. Below is what I have in my test file: -

//test.js file .click(page.create.withAttribute('mattooltip', 'Create job'))

At this point I need to randomly select 1 of the postcodes from the postcode.js file

Answer 1

Since "postcode" is an array, you can generate a random index as shown below:

var s = 55;
var random = function() {
   s = Math.sin(s) * 10000;
   return s - Math.floor(s);
};
//...
var postIndex = Math.floor(random() * postcode.length);
var currentPost = postcode[postIndex];

For example:

import { Selector } from 'testcafe';

fixture `Getting Started`
    .page `http://devexpress.github.io/testcafe/example`;

const postcode = [
    "b28 8ND", 
    "b49 6BD", 
    "b28 0ST", 
    "b31 4SU",
    "B92 9AH",
];

var s = 55
var random = function() {
    s = Math.sin(s) * 10000;
    return s - Math.floor(s);
};

test('My first test', async t => {

    var postIndex = Math.floor(random() * postcode.length);
    var currentPost = postcode[postIndex];

    console.log(currentPost)

    await t        
        .typeText('#developer-name', currentPost);
});