How to use expectToAllEqual method in Cypress

Just like Alex mentioned in the comment, you cannot return a value from cy commands. But you can do so in the .then block just like:

 it("should have text of 'Backpack'", () => {

  // I have changed the selector since the class name in your HTML is ".inventory_item_name" not ".inventory_item_price"
  cy.get(".inventory_item_name").then(($el) => {
    const text = $el.text(); // Now you have the text "Backpack"

    // Do the assertion here
    expect(text).to.eq("Backpack");
  });
});

You can learn more about why Cypress doesn't return value in this documentation

You can use the cy.route2() from cypress:

1. Go to cypress.json and write "experimentalNetworkStubbing": true

2. In your test.spec file write:

   cy.route2('GET', '/users/current', (req) => {
       req.reply((res) => {
           let list = JSON.parse(res.body)
           list.ds_version = 1
           res.send(list)
       })
   })
   

Use cy.request rather than fetch.

https://docs.cypress.io/api/commands/request

cy.request({yourUri}).as("response"); // This takes care of the async task. 
 
cy.get("@response").should((response) => { 
   // Carry on with the rest of your test
   cy.get("some selector");

});

I think what you want to do is use cy.request() to test the link exist.

cy.visit(pasted-link-here) might be tricky if the link you need to test is outside the original domain, but cy.request() can give you a status code.

cy.window().then(win => {
  win.navigator.clipboard.readText().then(urlFromClipboard => {
    cy.request(urlFromClipboard)
      .then(response => expect(response.status).to.eq(200))
  })
})

Actually, see here

cy.request() requires that the response status code be 2xx or 3xx

so you could just use this

cy.window().then(win => {
  win.navigator.clipboard.readText().then(urlFromClipboard => {
    cy.request(urlFromClipboard)
  })
})

and the test will fail if status code is a failure code.

It is very difficult to test a situation where an action has not occured. With this type of assertion, you can really only say:

"The XHR request was not made within the 400ms that Cypress looked for this XHR request to have been made (or whatever you set your timeout to be)"

This doesn't really confirm that the XHR request was never called.

That being said, Cypress offers a way to retrieve all XHR requests made using the undocumented cy.state('requests'). You could check the length of that, filter them by alias, etc to probably determine what you want.

Notice in the screenshot the testing attribute data-cy="gender-dropdown" does not appear.

If you search upwards (inside <ion-router-outlet>) the element that has the data-cy attribute is

<ion-select-option _ngcontent-dwb-c144="" data-cy="gender-dropdown" value="Woman" 
  ...
  class="md hydrated">Woman</ion-select-option>

but it's not the one you want to click.

Assuming you have opened the select a popup appears, a new section is added dynamically to the DOM with values based on the data-cy="gender-dropdown" tagged elements.

Unfortunately the popup does not carry the data-cy attribute, but you can search for the text within the ion-alert element:

// Opening the select
cy.contains('label', '*Gender')  // placeholder label
  .parent()                      // parent ion-select
  .click()                       // open

// Choosing the option
cy.get('ion-alert').within(() => {                       // popup section
  cy.contains('button.select-interface-option', 'Woman').click()
})

Since you are selecting the input with force: true (meaning that the actual input element is hidden from view), one possibility is that perhaps the input that is being referred doesn't have the requirements in place for the selectFile to succeed. Perhaps in Firefox the input type is inferred from context while in Chrome it would need to be explicitly set.

Have you checked that the element #new-project-photo passed to selectFile satisfies this requirement specifically (from the Cypress docs linked above)?

a single input element with type="file", or a label element attached to one

If you could post the element and its context that could help further recreate this scenario and allow testing. Right now from the information available it's not possible to recreate this problem reliably.

Just overwrite Date alone:

cy.clock(Date.UTC(2020, 6, 23), ['Date']);

Cypress' have.css uses chai-jquery which asserts computed value.

Thus, even though you've assigned translate(0%, 0px), it gets computed as none.

Alternatively, you could use assert like this:

cy.get('.myImage').should('have.attr', 'style').should('contain', 'transform: translate(0%, 0px)')