Cypress

1. Add a custom command mockServerRequest in support files, see example mock-server-request.js.

2. Use the custom command to define mocks:

   it('shows list of users', () => {
     // set up server-side mock
     cy.mockServerRequest('https://jsonplaceholder.typicode.com/users', {
       body: [{ id: 1, name: 'John Smith' }],
     });
   
     // navigate to the page
     cy.visit('/');
   
     // assert page content according to mock
     cy.get('li').first().should('have.text', 'John Smith');
   });