🧪install cypress

run yarn cypress to open E2E test runner
run yarn test to tun unit tests

.eslintrc.js

@@ -0,0 +1,19 @@
+module.exports = {
+  extends: ["react-app", "prettier"],
+  plugins: ["prettier", "jest", "cypress"],
+  parser: "babel-eslint",
+  env: {
+    browser: true,
+    "cypress/globals": true,
+    es6: true,
+    "jest/globals": true,
+  },
+  settings: {
+    react: {
+      version: "detect",
+    },
+  },
+  rules: {
+    "prettier/prettier": "warn",
+  },
+};

.gitignore

@@ -7,6 +7,7 @@
 
 # testing
 /coverage
+/cypress/integration/examples
 
 # production
 /build

.prettierrc.js

@@ -0,0 +1,6 @@
+module.exports = {
+  arrowParens: "avoid",
+  bracketSpacing: false,
+  singleQuote: true,
+  trailingComma: "all",
+};

cypress.json

@@ -0,0 +1 @@
+{}

cypress/fixtures/example.json

@@ -0,0 +1,5 @@
+{
+  "name": "Using fixtures to represent data",
+  "email": "hello@cypress.io",
+  "body": "Fixtures are a great way to mock data for responses to routes"
+}

cypress/plugins/index.js

@@ -0,0 +1,21 @@
+/// <reference types="cypress" />
+// ***********************************************************
+// This example plugins/index.js can be used to load plugins
+//
+// You can change the location of this file or turn off loading
+// the plugins file with the 'pluginsFile' configuration option.
+//
+// You can read more here:
+// https://on.cypress.io/plugins-guide
+// ***********************************************************
+
+// This function is called when a project is opened or re-opened (e.g. due to
+// the project's config changing)
+
+/**
+ * @type {Cypress.PluginConfig}
+ */
+module.exports = (on, config) => {
+  // `on` is used to hook into various events Cypress emits
+  // `config` is the resolved Cypress config
+}

cypress/support/commands.js

@@ -0,0 +1,25 @@
+// ***********************************************
+// This example commands.js shows you how to
+// create various custom commands and overwrite
+// existing commands.
+//
+// For more comprehensive examples of custom
+// commands please read more here:
+// https://on.cypress.io/custom-commands
+// ***********************************************
+//
+//
+// -- This is a parent command --
+// Cypress.Commands.add("login", (email, password) => { ... })
+//
+//
+// -- This is a child command --
+// Cypress.Commands.add("drag", { prevSubject: 'element'}, (subject, options) => { ... })
+//
+//
+// -- This is a dual command --
+// Cypress.Commands.add("dismiss", { prevSubject: 'optional'}, (subject, options) => { ... })
+//
+//
+// -- This will overwrite an existing command --
+// Cypress.Commands.overwrite("visit", (originalFn, url, options) => { ... })

cypress/support/index.js

@@ -0,0 +1,20 @@
+// ***********************************************************
+// This example support/index.js is processed and
+// loaded automatically before your test files.
+//
+// This is a great place to put global configuration and
+// behavior that modifies Cypress.
+//
+// You can change the location of this file or turn off
+// automatically serving support files with the
+// 'supportFile' configuration option.
+//
+// You can read more here:
+// https://on.cypress.io/configuration
+// ***********************************************************
+
+// Import commands.js using ES2015 syntax:
+import './commands'
+
+// Alternatively you can use CommonJS syntax:
+// require('./commands')

package.json

@@ -10,6 +10,7 @@
     "@types/node": "^12.0.0",
     "@types/react": "^16.9.0",
     "@types/react-dom": "^16.9.0",
+    "cypress": "^4.5.0",
     "react": "^16.13.1",
     "react-dom": "^16.13.1",
     "react-scripts": "3.4.1",
@@ -19,6 +20,7 @@
     "start": "react-scripts start",
     "build": "react-scripts build",
     "test": "react-scripts test",
+    "cypress": "cypress open",
     "eject": "react-scripts eject"
   },
   "eslintConfig": {