diff --git a/examples/characters/src/character.js b/examples/characters/src/character.js
index 8110c8d..e9b2959 100644
--- a/examples/characters/src/character.js
+++ b/examples/characters/src/character.js
@@ -2,21 +2,21 @@ import { Person } from './person.js';
 import { rollDice } from './roll-dice.js';
 
 export class Character extends Person {
-  constructor(firstName, lastName, role) {
+  constructor(firstName, lastName, role, level = 1, roll = rollDice) {
     super(firstName, lastName);
 
     this.role = role;
-    this.level = 1;
+    this.level = level;
 
     this.createdAt = new Date();
     this.lastModified = this.createdAt;
 
-    this.strength = rollDice(4, 6);
-    this.dexterity = rollDice(4, 6);
-    this.intelligence = rollDice(4, 6);
-    this.wisdom = rollDice(4, 6);
-    this.charisma = rollDice(4, 6);
-    this.constitution = rollDice(4, 6);
+    this.strength = roll(4, 6);
+    this.dexterity = roll(4, 6);
+    this.intelligence = roll(4, 6);
+    this.wisdom = roll(4, 6);
+    this.charisma = roll(4, 6);
+    this.constitution = roll(4, 6);
   }
 
   levelUp() {
diff --git a/examples/characters/src/character.test.ts b/examples/characters/src/character.test.ts
index 7d93ecb..911f5cf 100644
--- a/examples/characters/src/character.test.ts
+++ b/examples/characters/src/character.test.ts
@@ -1,14 +1,60 @@
-import { describe, it, expect } from 'vitest';
+import { describe, it, expect, vi } from 'vitest';
 import { Character } from './character.js';
 import { Person } from './person.js';
 
+const firstName = 'Ada';
+const lastName = 'Lovelace';
+const role = 'Computer Scienst';
+
 describe('Character', () => {
-  it.todo(
-    'should create a character with a first name, last name, and role',
-    () => {},
-  );
+  let character;
 
-  it.todo('should allow you to increase the level', () => {});
+  beforeEach(() => {
+    character = new Character(firstName, lastName, role, 1);
+  });
 
-  it.todo('should update the last modified date when leveling up', () => {});
+  it.skip('should create a character with a first name, last name, and role', () => {
+    expect(character).toEqual({
+      firstName,
+      lastName,
+      role,
+      strength: 12,
+      wisdom: 12,
+      dexterity: 12,
+      intelligence: 12,
+      constitution: 12,
+      charisma: 12,
+      level: 1,
+      lastModified: expect.any(Date),
+      createdAt: expect.any(Date),
+      id: expect.stringContaining('person-'),
+    });
+  });
+
+  it('should allow you to increase the level', () => {
+    const initialLevel = character.level;
+
+    character.levelUp();
+
+    expect(character.level).toBeGreaterThan(initialLevel);
+  });
+
+  it('should update the last modified date when leveling up', () => {
+    const initialLastModified = character.lastModified;
+
+    character.levelUp();
+
+    expect(character.lastModified).not.toBe(initialLastModified);
+  });
+
+  it.only('should roll four six-sided die', () => {
+    const rollDiceMock = vi.fn(() => 15);
+    const character = new Character(firstName, lastName, role, 1, rollDiceMock);
+
+    expect(character.strength).toBe(15);
+    expect(rollDiceMock).toHaveBeenCalledWith(4, 6);
+    expect(rollDiceMock).toHaveBeenCalledTimes(6);
+
+    console.log(rollDiceMock.mock.calls);
+  });
 });