🧪 Add e2e tests with Cypress

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

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+/// <reference types="cypress" />
+
+context('Utilities', () => {
+  beforeEach(() => {
+    cy.visit('https://example.cypress.io/utilities')
+  })
+
+  it('Cypress._ - call a lodash method', () => {
+    // https://on.cypress.io/_
+    cy.request('https://jsonplaceholder.cypress.io/users')
+      .then((response) => {
+        let ids = Cypress._.chain(response.body).map('id').take(3).value()
+
+        expect(ids).to.deep.eq([1, 2, 3])
+      })
+  })
+
+  it('Cypress.$ - call a jQuery method', () => {
+    // https://on.cypress.io/$
+    let $li = Cypress.$('.utility-jquery li:first')
+
+    cy.wrap($li)
+      .should('not.have.class', 'active')
+      .click()
+      .should('have.class', 'active')
+  })
+
+  it('Cypress.Blob - blob utilities and base64 string conversion', () => {
+    // https://on.cypress.io/blob
+    cy.get('.utility-blob').then(($div) => {
+      // https://github.com/nolanlawson/blob-util#imgSrcToDataURL
+      // get the dataUrl string for the javascript-logo
+      return Cypress.Blob.imgSrcToDataURL('https://example.cypress.io/assets/img/javascript-logo.png', undefined, 'anonymous')
+      .then((dataUrl) => {
+        // create an <img> element and set its src to the dataUrl
+        let img = Cypress.$('<img />', { src: dataUrl })
+
+        // need to explicitly return cy here since we are initially returning
+        // the Cypress.Blob.imgSrcToDataURL promise to our test
+        // append the image
+        $div.append(img)
+
+        cy.get('.utility-blob img').click()
+          .should('have.attr', 'src', dataUrl)
+      })
+    })
+  })
+
+  it('Cypress.minimatch - test out glob patterns against strings', () => {
+    // https://on.cypress.io/minimatch
+    let matching = Cypress.minimatch('/users/1/comments', '/users/*/comments', {
+      matchBase: true,
+    })
+
+    expect(matching, 'matching wildcard').to.be.true
+
+    matching = Cypress.minimatch('/users/1/comments/2', '/users/*/comments', {
+      matchBase: true,
+    })
+
+    expect(matching, 'comments').to.be.false
+
+    // ** matches against all downstream path segments
+    matching = Cypress.minimatch('/foo/bar/baz/123/quux?a=b&c=2', '/foo/**', {
+      matchBase: true,
+    })
+
+    expect(matching, 'comments').to.be.true
+
+    // whereas * matches only the next path segment
+
+    matching = Cypress.minimatch('/foo/bar/baz/123/quux?a=b&c=2', '/foo/*', {
+      matchBase: false,
+    })
+
+    expect(matching, 'comments').to.be.false
+  })
+
+  it('Cypress.Promise - instantiate a bluebird promise', () => {
+    // https://on.cypress.io/promise
+    let waited = false
+
+    /**
+     * @return Bluebird<string>
+     */
+    function waitOneSecond () {
+      // return a promise that resolves after 1 second
+      // @ts-ignore TS2351 (new Cypress.Promise)
+      return new Cypress.Promise((resolve, reject) => {
+        setTimeout(() => {
+          // set waited to true
+          waited = true
+
+          // resolve with 'foo' string
+          resolve('foo')
+        }, 1000)
+      })
+    }
+
+    cy.then(() => {
+      // return a promise to cy.then() that
+      // is awaited until it resolves
+      // @ts-ignore TS7006
+      return waitOneSecond().then((str) => {
+        expect(str).to.eq('foo')
+        expect(waited).to.be.true
+      })
+    })
+  })
+})