🧪 Add e2e tests with Cypress

frontend/cypress/integration-examples/2-advanced-examples/viewport.spec.js

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+/// <reference types="cypress" />
+
+context('Viewport', () => {
+  beforeEach(() => {
+    cy.visit('https://example.cypress.io/commands/viewport')
+  })
+
+  it('cy.viewport() - set the viewport size and dimension', () => {
+    // https://on.cypress.io/viewport
+
+    cy.get('#navbar').should('be.visible')
+    cy.viewport(320, 480)
+
+    // the navbar should have collapse since our screen is smaller
+    cy.get('#navbar').should('not.be.visible')
+    cy.get('.navbar-toggle').should('be.visible').click()
+    cy.get('.nav').find('a').should('be.visible')
+
+    // lets see what our app looks like on a super large screen
+    cy.viewport(2999, 2999)
+
+    // cy.viewport() accepts a set of preset sizes
+    // to easily set the screen to a device's width and height
+
+    // We added a cy.wait() between each viewport change so you can see
+    // the change otherwise it is a little too fast to see :)
+
+    cy.viewport('macbook-15')
+    cy.wait(200)
+    cy.viewport('macbook-13')
+    cy.wait(200)
+    cy.viewport('macbook-11')
+    cy.wait(200)
+    cy.viewport('ipad-2')
+    cy.wait(200)
+    cy.viewport('ipad-mini')
+    cy.wait(200)
+    cy.viewport('iphone-6+')
+    cy.wait(200)
+    cy.viewport('iphone-6')
+    cy.wait(200)
+    cy.viewport('iphone-5')
+    cy.wait(200)
+    cy.viewport('iphone-4')
+    cy.wait(200)
+    cy.viewport('iphone-3')
+    cy.wait(200)
+
+    // cy.viewport() accepts an orientation for all presets
+    // the default orientation is 'portrait'
+    cy.viewport('ipad-2', 'portrait')
+    cy.wait(200)
+    cy.viewport('iphone-4', 'landscape')
+    cy.wait(200)
+
+    // The viewport will be reset back to the default dimensions
+    // in between tests (the  default can be set in cypress.json)
+  })
+})