Update some of the exercises

examples/characters/src/person.test.js

@@ -0,0 +1,27 @@
+import { describe, it, expect } from 'vitest';
+import { Person } from './person.js';
+
+// Remove the `todo` from the `describe` to run the tests.
+describe.todo('Person', () => {
+  // This test will fail. Why?
+  it('should create a person with a first name and last name', () => {
+    const person = new Person('Grace', 'Hopper');
+    expect(person).toEqual({
+      firstName: 'Grace',
+      lastName: 'Hopper',
+    });
+  });
+
+  it('should throw an error if first name or last name is missing', () => {
+    expect(() => new Person('Grace')).toThrow(
+      'First name and last name are required',
+    );
+
+    expect(() => new Person()).toThrow('First name and last name are required');
+  });
+
+  it('should return the full name', () => {
+    const person = new Person('Grace', 'Hopper');
+    expect(person.fullName).toBe('Grace Hopper');
+  });
+});