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packages/shared/src/levels.test.ts

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+import { describe, it, expect } from "vitest";
+import { xpForLevel, levelFromXp, xpProgressInLevel } from "./levels";
+
+describe("xpForLevel", () => {
+  it("returns 0 for level 1", () => {
+    expect(xpForLevel(1)).toBe(0);
+  });
+
+  it("increases with level", () => {
+    expect(xpForLevel(2)).toBeGreaterThan(0);
+    expect(xpForLevel(10)).toBeGreaterThan(xpForLevel(5));
+  });
+});
+
+describe("levelFromXp", () => {
+  it("returns level 1 at zero XP", () => {
+    expect(levelFromXp(0)).toBe(1);
+  });
+
+  it("levels up at threshold", () => {
+    const level2Xp = xpForLevel(2);
+    expect(levelFromXp(level2Xp)).toBe(2);
+    expect(levelFromXp(level2Xp - 1)).toBe(1);
+  });
+});
+
+describe("xpProgressInLevel", () => {
+  it("computes progress within current level", () => {
+    const totalXp = xpForLevel(3) + 10;
+    const progress = xpProgressInLevel(totalXp);
+    expect(progress.level).toBe(3);
+    expect(progress.current).toBe(10);
+    expect(progress.percent).toBeGreaterThan(0);
+    expect(progress.percent).toBeLessThanOrEqual(100);
+  });
+});