Add campfireRest function with tests

src/run.js

@@ -23,6 +23,10 @@ export function endCombat(run, combatHp) {
   return { ...run, hp, combatCount: run.combatCount + 1 };
 }
 
+export function campfireRest(run) {
+  return { ...run, hp: Math.min(run.hp + 3, run.maxHp) };
+}
+
 export function revealRewards(run) {
   const count = Math.min(3, run.cardRewardsDeck.length);
   const revealed = run.cardRewardsDeck.slice(0, count);

src/run.test.js

@@ -2,6 +2,7 @@ import { beforeAll, describe, expect, test } from "bun:test";
 import { getAllCards, initCards } from "./cards.js";
 import { initEnemies } from "./enemies.js";
 import {
+  campfireRest,
   createRunState,
   endCombat,
   pickReward,
@@ -89,6 +90,20 @@ describe("endCombat", () => {
   });
 });
 
+describe("campfireRest", () => {
+  test("campfireRest heals 3 HP", () => {
+    const run = { hp: 5, maxHp: 11 };
+    const result = campfireRest(run);
+    expect(result.hp).toBe(8);
+  });
+
+  test("campfireRest does not heal above maxHp", () => {
+    const run = { hp: 10, maxHp: 11 };
+    const result = campfireRest(run);
+    expect(result.hp).toBe(11);
+  });
+});
+
 describe("rewards", () => {
   test("revealRewards removes 3 from rewards deck and returns them", () => {
     const run = createRunState("ironclad");