Add examples for button factory

examples/button-factory/src/button.js

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+export function createButton() {
+  const button = document.createElement('button');
+  button.textContent = 'Click Me';
+
+  button.addEventListener('click', () => {
+    button.textContent = 'Clicked!';
+  });
+
+  return button;
+}

examples/button-factory/src/button.test.js

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+import { it, expect, describe } from 'vitest';
+import { createButton } from './button.js';
+
+describe('createButton', () => {
+  it('should create a button element', () => {
+    const button = createButton();
+    expect(button.tagName).toBe('BUTTON');
+  });
+
+  it('should have the text "Click Me"', () => {
+    const button = createButton();
+    expect(button.textContent).toBe('Click Me');
+  });
+
+  it.todo('should change the text to "Clicked!" when clicked', async () => {});
+});

examples/button-factory/src/local-storage.test.js

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+import { it, expect } from 'vitest';
+
+it('should properly assign to localStorage', () => {
+  const key = 'secret';
+  const message = "It's a secret to everybody.";
+
+  localStorage.setItem(key, message);
+  expect(localStorage.getItem(key)).toBe(message);
+});

examples/button-factory/src/secret-input.js

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+export function createSecretInput() {
+  const id = 'secret-input';
+
+  const container = document.createElement('div');
+  const input = document.createElement('input');
+  const label = document.createElement('label');
+  const button = document.createElement('button');
+
+  input.id = id;
+  input.type = 'password';
+  input.name = 'secret';
+  input.placeholder = 'Enter your secret…';
+
+  label.htmlFor = id;
+  label.textContent = 'Secret';
+
+  button.id = `${id}-button`;
+  button.textContent = 'Store Secret';
+  button.addEventListener('click', () => {
+    localStorage.setItem('secret', input.value);
+    input.value = '';
+  });
+
+  container.appendChild(label);
+  container.appendChild(input);
+  container.appendChild(button);
+
+  return container;
+}

examples/button-factory/src/secret-input.test.js

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+import { describe, expect, it, beforeEach } from 'vitest';
+import { screen } from '@testing-library/dom';
+import userEvent from '@testing-library/user-event';
+import { createSecretInput } from './secret-input.js';
+
+describe.todo('createSecretInput', async () => {});