added cypress e2e tests

cypress/e2e/game.cy.js

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+const io = require('socket.io-client');
+const socket = io.connect('http://localhost:8080', { withCredentials: true });
+const uniqName = Date.now().toString();
+
+describe('game', () => {
+    before(() => {
+        cy.visit('http://localhost:3000');
+        cy.get('[placeholder="Server Name"]').type(uniqName);
+        cy.get('button:contains("Host")').click();
+        const room = cy.contains(`${uniqName}`).should('exist');
+        room.closest('tr').find('button:contains("Join")').click();
+        const e = cy.get('[placeholder="Nickname"]').type('player1');
+        e.type('{enter}');
+        setTimeout(() => {
+            socket.emit('room:rooms');
+            socket.on('room:rooms', rooms => {
+                const roomId = JSON.parse(rooms).find(r => r.name === uniqName)._id;
+                socket.emit('player:login', { roomId: roomId, name: 'player2', password: '' });
+            });
+        }, 1000);
+    });
+
+    it('starts game correctly', () => {
+        socket.emit('player:ready');
+        cy.get('.PrivateSwitchBase-input').click();
+        cy.get('[data-testid="animated-overlay"]').should('exist');
+        socket.emit('');
+    });
+});

cypress/e2e/login.cy.js

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+describe('login', () => {
+    it('should change color of input if the server name is invalid', () => {
+        cy.visit('http://localhost:3000');
+        cy.get('button:contains("Host")').click();
+        cy.get('[placeholder="Server Name"]').should('have.css', 'border-color', 'rgb(255, 0, 0)');
+    });
+    
+    it('should redirect user to game when filling inputs correctly', () => {
+        cy.visit('http://localhost:3000');
+        const uniqName = Date.now().toString();
+        cy.get('[placeholder="Server Name"]').type(uniqName);
+        cy.get('.PrivateSwitchBase-input').click();
+        cy.get('[placeholder="password"]').type('123456');
+        cy.get('button:contains("Host")').click();
+        const room = cy
+            .contains(`${uniqName}`)
+            .should('exist')
+            .then($room => {
+                cy.wrap($room).scrollIntoView();
+            });
+        room.closest('tr').find('button:contains("Join")').click();
+        cy.get('[placeholder="Nickname"]').type('player1');
+        const e = cy.get('[placeholder="Room password"]').type('123456');
+        e.type('{enter}');
+        cy.url().should('include', '/game');
+        cy.contains('player1').should('exist');
+        cy.get('canvas').should('exist');
+    });
+});

cypress/fixtures/example.json

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

cypress/support/commands.js

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+// ***********************************************
+// 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/e2e.js

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+// ***********************************************************
+// This example support/e2e.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')