Calculate sum of values in Cypress - cucumber

Question

I am using BDD/Cucumber with Cypress. I want to calculate the sum of some rows of table.
This is my step definition:
And("I add up all the total on hand",()=>{
const sumOnHand = itemListPage.totalOnHandAmsterdam()+itemListPage.totalOnHandDelft()
cy.log(sumOnHand)
})
And this is my js page:
totalOnHandAmsterdam() {
cy.get(':nth-child(2) > .dx-grandtotal > span').invoke('text').then(text =>{
const ttOnHandAmst = text
return ttOnHandAmst;
})
}
totalOnHandDelft() {
cy.get(':nth-child(11) > .dx-grandtotal > span').invoke('text').then(text =>{
const ttOnHandDelft = text
return ttOnHandDelft;
})
}
But this is the output of the calculation:
Any ideas on how can I sum up this value is appreciated.

Answer 1

You can't use the results of totalOnHandAmsterdam() and totalOnHandDelft() directly in a summation because
they don't return anything (the return inside .then(text => does not return the value from the function).
Cypress commands don't return values, they add the values to the command queue
You can do it like this
totalOnHandAmsterdam() {
return cy.get(':nth-child(2) > .dx-grandtotal > span')
.invoke('text').then(parseInt)
}
totalOnHandDelft() {
return cy.get(':nth-child(11) > .dx-grandtotal > span')
.invoke('text').then(parseInt)
}
And("I add up all the total on hand", () => {
itemListPage.totalOnHandAmsterdam().then(ams => // get value on command queue
itemListPage.totalOnHandDelft().then(delft => // get other value
const sumOnHand = ams + delft;
cy.log(sumOnHand)
})
})
})
The key to accessing command return values is using .then() after the command.
It's annoying but necessary because Cypress ensures that the web page has received data from the server before evaluating the element text.
Since the test runs faster than web page fetches data, it can easily evaluate the text before the page is fully populated.

Answer 2

You have to convert your texts to numbers and then add it. You can simply add + in front of the number to convert them into Integers. Also I have added trim() in case your strings have any unwanted spaces.
And('I add up all the total on hand', () => {
const sumOnHand =
+itemListPage.totalOnHandAmsterdam().trim() + +itemListPage.totalOnHandDelft().trim()
cy.log(sumOnHand)
})

Answer 3

You could set the function results as aliases.
Since the code is asynchronous, access it within cy.then().
totalOnHandAmsterdam() {
cy.get(':nth-child(2) > .dx-grandtotal > span')
.invoke('text')
.then(parseInt)
.as('amsterdamTotal') // alias will set this.amsterdamTotal
}
totalOnHandDelft() {
return cy.get(':nth-child(11) > .dx-grandtotal > span')
.invoke('text')
.then(parseInt)
.as('defltTotal') // alias will set this.delftTotal
}
And("I add up all the total on hand", function() { // use function() to access "this"
po.totalOnHandAmsterdam()
po.totalOnHandDelft()
cy.then(() => {
const sumOnHand = this.amsterdamTotal + this.defltTotal;
cy.log(sumOnHand)
})
})