🧪 Add e2e tests with Cypress

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

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+/// <reference types="cypress" />
+
+/// JSON fixture file can be loaded directly using
+// the built-in JavaScript bundler
+// @ts-ignore
+const requiredExample = require('../../fixtures/example')
+
+context('Files', () => {
+  beforeEach(() => {
+    cy.visit('https://example.cypress.io/commands/files')
+  })
+
+  beforeEach(() => {
+    // load example.json fixture file and store
+    // in the test context object
+    cy.fixture('example.json').as('example')
+  })
+
+  it('cy.fixture() - load a fixture', () => {
+    // https://on.cypress.io/fixture
+
+    // Instead of writing a response inline you can
+    // use a fixture file's content.
+
+    // when application makes an Ajax request matching "GET **/comments/*"
+    // Cypress will intercept it and reply with the object in `example.json` fixture
+    cy.intercept('GET', '**/comments/*', { fixture: 'example.json' }).as('getComment')
+
+    // we have code that gets a comment when
+    // the button is clicked in scripts.js
+    cy.get('.fixture-btn').click()
+
+    cy.wait('@getComment').its('response.body')
+      .should('have.property', 'name')
+      .and('include', 'Using fixtures to represent data')
+  })
+
+  it('cy.fixture() or require - load a fixture', function () {
+    // we are inside the "function () { ... }"
+    // callback and can use test context object "this"
+    // "this.example" was loaded in "beforeEach" function callback
+    expect(this.example, 'fixture in the test context')
+      .to.deep.equal(requiredExample)
+
+    // or use "cy.wrap" and "should('deep.equal', ...)" assertion
+    cy.wrap(this.example)
+      .should('deep.equal', requiredExample)
+  })
+
+  it('cy.readFile() - read file contents', () => {
+    // https://on.cypress.io/readfile
+
+    // You can read a file and yield its contents
+    // The filePath is relative to your project's root.
+    cy.readFile('cypress.json').then((json) => {
+      expect(json).to.be.an('object')
+    })
+  })
+
+  it('cy.writeFile() - write to a file', () => {
+    // https://on.cypress.io/writefile
+
+    // You can write to a file
+
+    // Use a response from a request to automatically
+    // generate a fixture file for use later
+    cy.request('https://jsonplaceholder.cypress.io/users')
+      .then((response) => {
+        cy.writeFile('cypress/fixtures/users.json', response.body)
+      })
+
+    cy.fixture('users').should((users) => {
+      expect(users[0].name).to.exist
+    })
+
+    // JavaScript arrays and objects are stringified
+    // and formatted into text.
+    cy.writeFile('cypress/fixtures/profile.json', {
+      id: 8739,
+      name: 'Jane',
+      email: 'jane@example.com',
+    })
+
+    cy.fixture('profile').should((profile) => {
+      expect(profile.name).to.eq('Jane')
+    })
+  })
+})