🧪 test: test getXPForLevel boundary values

lib/urwis/engine.test.ts

@@ -0,0 +1,36 @@
+import { describe, it, expect } from 'vitest';
+import { getXPForLevel } from './engine';
+import { URWIS_CONFIG } from './config';
+
+describe('getXPForLevel', () => {
+  it('should return BASE_XP for level 1', () => {
+    expect(getXPForLevel(1)).toBe(URWIS_CONFIG.LEVELING.BASE_XP);
+  });
+
+  it('should handle boundary case: level 0', () => {
+    expect(getXPForLevel(0)).toBe(URWIS_CONFIG.LEVELING.BASE_XP);
+  });
+
+  it('should handle negative levels as level 1', () => {
+    expect(getXPForLevel(-5)).toBe(URWIS_CONFIG.LEVELING.BASE_XP);
+  });
+
+  it('should handle normal progression for level 2', () => {
+    const expected = Math.floor(URWIS_CONFIG.LEVELING.BASE_XP * URWIS_CONFIG.LEVELING.EXPONENT);
+    expect(getXPForLevel(2)).toBe(expected);
+  });
+
+  it('should handle normal progression for level 3', () => {
+    const expected = Math.floor(URWIS_CONFIG.LEVELING.BASE_XP * Math.pow(URWIS_CONFIG.LEVELING.EXPONENT, 2));
+    expect(getXPForLevel(3)).toBe(expected);
+  });
+
+  it('should handle high levels correctly', () => {
+    const expected = Math.floor(URWIS_CONFIG.LEVELING.BASE_XP * Math.pow(URWIS_CONFIG.LEVELING.EXPONENT, 99));
+    expect(getXPForLevel(100)).toBe(expected);
+  });
+
+  it('should handle NaN as level 1', () => {
+    expect(getXPForLevel(NaN)).toBe(URWIS_CONFIG.LEVELING.BASE_XP);
+  });
+});