Introduce e2e test

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/integration/basic.js

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+describe('Basic', () => {
+	before(() => {
+		cy.request('POST', '/api/reset-db');
+	});
+
+	beforeEach(() => {
+		cy.reload(true);
+	});
+
+  it('successfully loads', () => {
+    cy.visit('/');
+  });
+
+	it('setup instance', () => {
+    cy.visit('/');
+
+		cy.get('[data-cy-admin-username] input').type('admin');
+
+		cy.get('[data-cy-admin-password] input').type('admin1234');
+
+		cy.get('[data-cy-admin-ok]').click();
+  });
+
+	it('signup', () => {
+    cy.visit('/');
+
+		cy.get('[data-cy-signup]').click();
+
+		cy.get('[data-cy-signup-username] input').type('alice');
+
+		cy.get('[data-cy-signup-password] input').type('alice1234');
+	
+		cy.get('[data-cy-signup-password-retype] input').type('alice1234');
+
+		cy.get('[data-cy-signup-submit]').click();
+  });
+
+	it('signin', () => {
+    cy.visit('/');
+
+		cy.get('[data-cy-signin]').click();
+
+		cy.get('[data-cy-signin-username] input').type('alice');
+
+		// Enterキーでサインインできるかの確認も兼ねる
+		cy.get('[data-cy-signin-password] input').type('alice1234{enter}');
+  });
+
+	it('note', () => {
+    cy.visit('/');
+
+		//#region TODO: この辺はUI操作ではなくAPI操作でログインする
+		cy.get('[data-cy-signin]').click();
+
+		cy.get('[data-cy-signin-username] input').type('alice');
+
+		// Enterキーでサインインできるかの確認も兼ねる
+		cy.get('[data-cy-signin-password] input').type('alice1234{enter}');
+		//#endregion
+
+		cy.get('[data-cy-open-post-form]').click();
+
+		cy.get('[data-cy-post-form-text]').type('Hello, Misskey!');
+
+		cy.get('[data-cy-open-post-form-submit]').click();
+
+		// TODO: 投稿した文字列が画面内にあるか(=タイムラインに流れてきたか)のテスト
+  });
+});

cypress/plugins/index.js

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+/// <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}
+ */
+// eslint-disable-next-line no-unused-vars
+module.exports = (on, config) => {
+  // `on` is used to hook into various events Cypress emits
+  // `config` is the resolved Cypress config
+}

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/index.js

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+// ***********************************************************
+// 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')