✨Feature: add town systems, saves, recovery, and level progression

src/rules/progression.test.ts

@@ -0,0 +1,71 @@
+import { describe, expect, it } from "vitest";
+
+import { sampleContentPack } from "@/data/sampleContentPack";
+
+import { createStartingAdventurer } from "./character";
+import {
+  applyLevelProgression,
+  getLevelForXp,
+  getNextLevelXpThreshold,
+  getXpThresholdForLevel,
+} from "./progression";
+
+function createAdventurer() {
+  return createStartingAdventurer(sampleContentPack, {
+    name: "Aster",
+    weaponId: "weapon.short-sword",
+    armourId: "armour.leather-vest",
+    scrollId: "scroll.lesser-heal",
+  });
+}
+
+describe("level progression rules", () => {
+  it("uses linear xp thresholds for the current MVP ruleset", () => {
+    expect(getXpThresholdForLevel(1)).toBe(0);
+    expect(getXpThresholdForLevel(2)).toBe(8);
+    expect(getXpThresholdForLevel(3)).toBe(16);
+    expect(getNextLevelXpThreshold(1)).toBe(8);
+    expect(getLevelForXp(0)).toBe(1);
+    expect(getLevelForXp(8)).toBe(2);
+    expect(getLevelForXp(16)).toBe(3);
+  });
+
+  it("levels up immediately once xp crosses a threshold", () => {
+    const adventurer = createAdventurer();
+    adventurer.xp = 8;
+    adventurer.hp.current = 7;
+
+    const result = applyLevelProgression({
+      content: sampleContentPack,
+      adventurer,
+      at: "2026-03-18T10:00:00.000Z",
+    });
+
+    expect(result.adventurer.level).toBe(2);
+    expect(result.adventurer.hp.max).toBe(12);
+    expect(result.adventurer.hp.current).toBe(9);
+    expect(result.adventurer.manoeuvreIds).toContain("manoeuvre.sweeping-cut");
+    expect(result.levelUps).toEqual([
+      expect.objectContaining({
+        previousLevel: 1,
+        newLevel: 2,
+        hpGained: 2,
+        unlockedManoeuvreIds: ["manoeuvre.sweeping-cut"],
+      }),
+    ]);
+  });
+
+  it("leaves the adventurer unchanged when no threshold is crossed", () => {
+    const adventurer = createAdventurer();
+    adventurer.xp = 7;
+
+    const result = applyLevelProgression({
+      content: sampleContentPack,
+      adventurer,
+    });
+
+    expect(result.adventurer.level).toBe(1);
+    expect(result.adventurer.hp.max).toBe(10);
+    expect(result.levelUps).toEqual([]);
+  });
+});