Add examples

examples/yearbook/package.json

@@ -0,0 +1,24 @@
+{
+  "name": "yearbook",
+  "version": "1.0.0",
+  "main": "index.js",
+  "type": "module",
+  "scripts": {
+    "test": "vitest"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/stevekinney/testing-javascript.git"
+  },
+  "author": "Steve Kinney <hello@stevekinney.net>",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/stevekinney/testing-javascript/issues"
+  },
+  "homepage": "https://github.com/stevekinney/testing-javascript#readme",
+  "devDependencies": {
+    "@vitest/ui": "^2.1.1",
+    "vite": "^5.4.5",
+    "vitest": "^2.1.1"
+  }
+}

examples/yearbook/person.js

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+export class Person {
+  /**
+   * A person in the yearbook.
+   * @param {string} firstName
+   * @param {string} lastName
+   * @param {string} dateOfBirth
+   */
+  constructor(firstName, lastName, dateOfBirth) {
+    this.firstName = firstName;
+    this.lastName = lastName;
+    this.dateOfBirth = dateOfBirth;
+  }
+
+  get fullName() {
+    return `${this.firstName} ${this.lastName}`;
+  }
+
+  get age() {
+    const today = new Date();
+    const birthDate = new Date(this.dateOfBirth);
+
+    let age = today.getFullYear() - birthDate.getFullYear();
+    const month = today.getMonth() - birthDate.getMonth();
+
+    if (month < 0 || (month === 0 && today.getDate() < birthDate.getDate())) {
+      age--;
+    }
+
+    return age;
+  }
+}

examples/yearbook/person.test.js

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+import { describe, expect, it } from 'vitest';
+import { Person } from './person';
+
+describe('Person', () => {
+  it('should be an instance of a Person', () => {
+    const person = new Person('John', 'Doe', '2000-01-01');
+    expect(person).toBeInstanceOf(Person);
+  });
+});