Cypress testing pseudo CSS class :before - css

Question

Is there a way in which I can test the content of the pseudo CSS class for :before on my element with Cypress?
I have seen links documenting:
Accessing nth-child pseudo element
Accessing the actual content pseudo class of a normal CSS class
But I have not found anything for CSS classes using the ::before pseudo class.
Imagine the code:
.myClass:before {
content: "foo-";
}
<div>
<span class="myClass">Bar</span>
</div>
How could one test that 'foo-' is present?

Answer 1

There's a way to assert on the CSS properties of pseudo-elements, although it's not as simple as just using a Cypress command.
Use cy.get() to get a reference to the element.
Read the Window object off of the element, and then invoke Window.getComputedStyle(), which can read the computed CSS of pseudo selectors.
Use getPropertyValue on the returned CSS declaration to read the value of the content property.
Assert on it.
Here's an example that works on the code posted in the OP:
cy.get('.myClass')
.then($els => {
// get Window reference from element
const win = $els[0].ownerDocument.defaultView
// use getComputedStyle to read the pseudo selector
const before = win.getComputedStyle($els[0], 'before')
// read the value of the `content` CSS property
const contentValue = before.getPropertyValue('content')
// the returned value will have double quotes around it, but this is correct
expect(contentValue).to.eq('"foo-"')
})

Answer 2

Based on Zach's answer I created a command that returns the pseudo-element property (without single quotes around).
function unquote(str) {
return str.replace(/(^")|("$)/g, '');
}
Cypress.Commands.add(
'before',
{
prevSubject: 'element',
},
(el, property) => {
const win = el[0].ownerDocument.defaultView;
const before = win.getComputedStyle(el[0], 'before');
return unquote(before.getPropertyValue(property));
},
);
You will use it like this
it('color is black', () => {
cy.get('button')
.before('color')
.should('eq', 'rgb(0,0,0)'); // Or .then()
});

Answer 3

Try asserting on the text of the parent:
cy.get('.myClass').parent().should('have.text', 'foo-bar')
If that doesn't work, you may have to use the textContent property:
cy.get('.myClass').parent(). should($el => expect ($el).to.contain('foo-bar')
)

Answer 4

This was my solution to get, convert and compare a hexadecimal's background-color with a rgb returned.
const RGBToHex = (rgbColor) => {
// it parse rgb(255, 13, 200) to #fa92D4
const [red, green, blue] = rgbColor.replace(/[a-z]|\(|\)|\s/g, '').split(',');
let r = parseInt(red, 10).toString(16);
let g = parseInt(green, 10).toString(16);
let b = parseInt(blue, 10).toString(16);
if (r.length === 1) r = `0${r}`;
if (g.length === 1) g = `0${g}`;
if (b.length === 1) b = `0${b}`;
return `#${r}${g}${b}`;
};
cy.get('.element').then(($el) => {
const win = $el[0].ownerDocument.defaultView;
const before = win.getComputedStyle($el[0], 'before');
const bgColor = before.getPropertyValue('background-color');
expect(RGBToHex(bgColor)).to.eq('#HEXA');
});