Cypress Testing Pseudo CSS Class :Before

Cypress testing pseudo CSS class :before

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.

1. Use cy.get() to get a reference to the element.
2. Read the Window object off of the element, and then invoke Window.getComputedStyle(), which can read the computed CSS of pseudo selectors.
3. Use getPropertyValue on the returned CSS declaration to read the value of the content property.
4. 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-"')
})

Cypress automation - control with pseudo css selector is always present in style

You can use the below to check whether the checkbox is checked or not.

To check whether the checkbox is checked:

cy.get(selector).should('be.checked')

To check whether the checkbox is not checked:

cy.get(selector).should('not.be.checked')

Combining pseudo element and pseudo class won't work

It seems that the CSS code #breadcrumbs li:nth-child(2)::before {content: ">"} was fine, and the problem was due to id-class clashing in the html.twig template files.

What solved the issue was changing in breadcrumb.html.twig, from:

{% if breadcrumb %}
  <nav class="breadcrumb" role="navigation" aria-labelledby="system-breadcrumb">
    <h2 id="system-breadcrumb" class="visually-hidden">{{ 'Breadcrumb'|t }}</h2>

To:

{% if breadcrumb %}
  <nav role="navigation" aria-labelledby="system-breadcrumb">
    <h2{{ 'Breadcrumb'|t }}</h2>

Now, the #breadcrumbs id directives, don't clash with either these of .breadcrumb class, or #system-breadcrumb id.

Finding elements: different syntax - different results - Explanation needed

contains('xdz') is a cypress command which always yields only the first element containing the text. You can read more about it from this Github Thread.

:contains("xdz") is a Jquery command and it returns all elements containing the text. You can read more about it from the Jquery Docs.

Cypress component testing is not loading CSS while running testcases

You can try importing the css in the index.ts or index.js file that will be available in the location -> cypress/support/index.ts

Trying to understand ::before - strange (to me) behavior?

::before pseudo-element in not actually a DOM element, appears on the page after DOM load. In this case everything is right - first li element is :first-child.

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