Cypress tests are passing when they should fail

I’m writing Cypress tests and running them headless in terminal. The tests are passing even when they should fail.

For example writing this code:

describe('Website Landing', () => {    
    it.only('Should load', async () => {
        cy.visit('http://www.mywebsite.com/');
        cy.get('[data-testid="sign-inx"]');
    })
})

And running this on terminal will end on success:

cypress run

But there is no element with such attribute and value. And if I add other assertions at the end, the test keeps passing

cy.get('[data-testid="sign-inx"]').should('have.length', 1);

I don’t understand how Cypress manages to allow tests to pass and to fail. Could someone help?