First commit, phased 1 and 2 created but untested

tests/unit/classes.test.js

@@ -0,0 +1,53 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+const { CLASSES, CLASS_KEYS, getClass, getBaseStats } = require('../../src/game/classes');
+
+test('CLASSES contains exactly 3 classes', () => {
+  assert.equal(CLASS_KEYS.length, 3);
+  assert.ok(CLASS_KEYS.includes('warrior'));
+  assert.ok(CLASS_KEYS.includes('mage'));
+  assert.ok(CLASS_KEYS.includes('ranger'));
+});
+
+test('getClass returns correct base stats for warrior', () => {
+  const stats = getBaseStats('warrior');
+  assert.equal(stats.str, 8);
+  assert.equal(stats.agi, 4);
+  assert.equal(stats.int, 2);
+  assert.equal(stats.vit, 8);
+});
+
+test('getClass returns correct base stats for mage', () => {
+  const stats = getBaseStats('mage');
+  assert.equal(stats.str, 2);
+  assert.equal(stats.agi, 4);
+  assert.equal(stats.int, 9);
+  assert.equal(stats.vit, 5);
+});
+
+test('getClass returns correct base stats for ranger', () => {
+  const stats = getBaseStats('ranger');
+  assert.equal(stats.str, 5);
+  assert.equal(stats.agi, 9);
+  assert.equal(stats.int, 3);
+  assert.equal(stats.vit, 5);
+});
+
+test('getClass throws for unknown class', () => {
+  assert.throws(() => getClass('paladin'), Error);
+});
+
+test('getClass returns the class object with name and primary', () => {
+  const warrior = getClass('warrior');
+  assert.equal(warrior.name, 'Warrior');
+  assert.equal(warrior.primary, 'str');
+  assert.ok(warrior.bonuses.defensePct);
+
+  const mage = getClass('mage');
+  assert.equal(mage.primary, 'int');
+  assert.ok(mage.bonuses.magicVsHighDef);
+
+  const ranger = getClass('ranger');
+  assert.equal(ranger.primary, 'agi');
+  assert.ok(ranger.bonuses.critChance);
+});