diff --git a/lib/urwis/engine.test.ts b/lib/urwis/engine.test.ts
new file mode 100644
index 0000000..c3e5b72
--- /dev/null
+++ b/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);
+  });
+});
diff --git a/package-lock.json b/package-lock.json
index 433dffd..f027979 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -77,7 +77,8 @@
         "shadcn": "^3.8.4",
         "tailwindcss": "^4",
         "tw-animate-css": "^1.4.0",
-        "typescript": "5.7.3"
+        "typescript": "5.7.3",
+        "vitest": "^4.1.2"
       }
     },
     "node_modules/@ai-sdk/gateway": {
@@ -2680,6 +2681,16 @@
         "node": ">=8.0.0"
       }
     },
+    "node_modules/@oxc-project/types": {
+      "version": "0.122.0",
+      "resolved": "https://registry.npmjs.org/@oxc-project/types/-/types-0.122.0.tgz",
+      "integrity": "sha512-oLAl5kBpV4w69UtFZ9xqcmTi+GENWOcPF7FCrczTiBbmC0ibXxCwyvZGbO39rCVEuLGAZM84DH0pUIyyv/YJzA==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/Boshen"
+      }
+    },
     "node_modules/@pkgjs/parseargs": {
       "version": "0.11.0",
       "resolved": "https://registry.npmjs.org/@pkgjs/parseargs/-/parseargs-0.11.0.tgz",
@@ -4472,6 +4483,305 @@
         "url": "https://opencollective.com/immer"
       }
     },
+    "node_modules/@rolldown/binding-android-arm64": {
+      "version": "1.0.0-rc.12",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-android-arm64/-/binding-android-arm64-1.0.0-rc.12.tgz",
+      "integrity": "sha512-pv1y2Fv0JybcykuiiD3qBOBdz6RteYojRFY1d+b95WVuzx211CRh+ytI/+9iVyWQ6koTh5dawe4S/yRfOFjgaA==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@rolldown/binding-darwin-arm64": {
+      "version": "1.0.0-rc.12",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-arm64/-/binding-darwin-arm64-1.0.0-rc.12.tgz",
+      "integrity": "sha512-cFYr6zTG/3PXXF3pUO+umXxt1wkRK/0AYT8lDwuqvRC+LuKYWSAQAQZjCWDQpAH172ZV6ieYrNnFzVVcnSflAg==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@rolldown/binding-darwin-x64": {
+      "version": "1.0.0-rc.12",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-darwin-x64/-/binding-darwin-x64-1.0.0-rc.12.tgz",
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+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@rolldown/binding-freebsd-x64": {
+      "version": "1.0.0-rc.12",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-freebsd-x64/-/binding-freebsd-x64-1.0.0-rc.12.tgz",
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+        "x64"
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+      "license": "MIT",
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+        "freebsd"
+      ],
+      "engines": {
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+      }
+    },
+    "node_modules/@rolldown/binding-linux-arm-gnueabihf": {
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+      }
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+        "s390x"
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+      }
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+        "wasm32"
+      ],
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+      "license": "MIT",
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+      "dependencies": {
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+      },
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+        "node": ">=14.0.0"
+      }
+    },
+    "node_modules/@rolldown/binding-wasm32-wasi/node_modules/@napi-rs/wasm-runtime": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@napi-rs/wasm-runtime/-/wasm-runtime-1.1.2.tgz",
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+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
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+      },
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+        "type": "github",
+        "url": "https://github.com/sponsors/Brooooooklyn"
+      },
+      "peerDependencies": {
+        "@emnapi/core": "^1.7.1",
+        "@emnapi/runtime": "^1.7.1"
+      }
+    },
+    "node_modules/@rolldown/binding-win32-arm64-msvc": {
+      "version": "1.0.0-rc.12",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-win32-arm64-msvc/-/binding-win32-arm64-msvc-1.0.0-rc.12.tgz",
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+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@rolldown/binding-win32-x64-msvc": {
+      "version": "1.0.0-rc.12",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-win32-x64-msvc/-/binding-win32-x64-msvc-1.0.0-rc.12.tgz",
+      "integrity": "sha512-PyqoipaswDLAZtot351MLhrlrh6lcZPo2LSYE+VDxbVk24LVKAGOuE4hb8xZQmrPAuEtTZW8E6D2zc5EUZX4Lw==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      }
+    },
+    "node_modules/@rolldown/pluginutils": {
+      "version": "1.0.0-rc.12",
+      "resolved": "https://registry.npmjs.org/@rolldown/pluginutils/-/pluginutils-1.0.0-rc.12.tgz",
+      "integrity": "sha512-HHMwmarRKvoFsJorqYlFeFRzXZqCt2ETQlEDOb9aqssrnVBB1/+xgTGtuTrIk5vzLNX1MjMtTf7W9z3tsSbrxw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@rtsao/scc": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/@rtsao/scc/-/scc-1.1.0.tgz",
@@ -6093,6 +6403,17 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/chai": {
+      "version": "5.2.3",
+      "resolved": "https://registry.npmjs.org/@types/chai/-/chai-5.2.3.tgz",
+      "integrity": "sha512-Mw558oeA9fFbv65/y4mHtXDs9bPnFMZAL/jxdPFUpOHHIXX91mcgEHbS5Lahr+pwZFR8A7GQleRWeI6cGFC2UA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/deep-eql": "*",
+        "assertion-error": "^2.0.1"
+      }
+    },
     "node_modules/@types/d3-array": {
       "version": "3.2.2",
       "resolved": "https://registry.npmjs.org/@types/d3-array/-/d3-array-3.2.2.tgz",
@@ -6165,6 +6486,13 @@
         "@types/ms": "*"
       }
     },
+    "node_modules/@types/deep-eql": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/@types/deep-eql/-/deep-eql-4.0.2.tgz",
+      "integrity": "sha512-c9h9dVVMigMPc4bwTvC5dxqtqJZwQPePsWjPlpSOnojbor6pGqdk541lfA7AqFQr5pB1BRdq0juY9db81BwyFw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/draco3d": {
       "version": "1.4.10",
       "resolved": "https://registry.npmjs.org/@types/draco3d/-/draco3d-1.4.10.tgz",
@@ -6793,43 +7121,156 @@
         }
       }
     },
-    "node_modules/@webgpu/types": {
-      "version": "0.1.69",
-      "resolved": "https://registry.npmjs.org/@webgpu/types/-/types-0.1.69.tgz",
-      "integrity": "sha512-RPmm6kgRbI8e98zSD3RVACvnuktIja5+yLgDAkTmxLr90BEwdTXRQWNLF3ETTTyH/8mKhznZuN5AveXYFEsMGQ==",
-      "license": "BSD-3-Clause"
-    },
-    "node_modules/accepts": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/accepts/-/accepts-2.0.0.tgz",
-      "integrity": "sha512-5cvg6CtKwfgdmVqY1WIiXKc3Q1bkRqGLi+2W/6ao+6Y7gu/RCwRuAhGEzh5B4KlszSuTLgZYuqFqo5bImjNKng==",
+    "node_modules/@vitest/expect": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/@vitest/expect/-/expect-4.1.2.tgz",
+      "integrity": "sha512-gbu+7B0YgUJ2nkdsRJrFFW6X7NTP44WlhiclHniUhxADQJH5Szt9mZ9hWnJPJ8YwOK5zUOSSlSvyzRf0u1DSBQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "mime-types": "^3.0.0",
-        "negotiator": "^1.0.0"
+        "@standard-schema/spec": "^1.1.0",
+        "@types/chai": "^5.2.2",
+        "@vitest/spy": "4.1.2",
+        "@vitest/utils": "4.1.2",
+        "chai": "^6.2.2",
+        "tinyrainbow": "^3.1.0"
       },
-      "engines": {
-        "node": ">= 0.6"
+      "funding": {
+        "url": "https://opencollective.com/vitest"
       }
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+    "node_modules/@vitest/mocker": {
+      "version": "4.1.2",
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-        "acorn": "bin/acorn"
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+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
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+      "peerDependenciesMeta": {
+        "msw": {
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+        "vite": {
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+        "std-env": "^4.0.0-rc.1",
+        "tinybench": "^2.9.0",
+        "tinyexec": "^1.0.2",
+        "tinyglobby": "^0.2.15",
+        "tinyrainbow": "^3.1.0",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0",
+        "why-is-node-running": "^2.3.0"
+      },
+      "bin": {
+        "vitest": "vitest.mjs"
+      },
+      "engines": {
+        "node": "^20.0.0 || ^22.0.0 || >=24.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@opentelemetry/api": "^1.9.0",
+        "@types/node": "^20.0.0 || ^22.0.0 || >=24.0.0",
+        "@vitest/browser-playwright": "4.1.2",
+        "@vitest/browser-preview": "4.1.2",
+        "@vitest/browser-webdriverio": "4.1.2",
+        "@vitest/ui": "4.1.2",
+        "happy-dom": "*",
+        "jsdom": "*",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
+      },
+      "peerDependenciesMeta": {
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+        },
+        "@types/node": {
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+        },
+        "@vitest/browser-playwright": {
+          "optional": true
+        },
+        "@vitest/browser-preview": {
+          "optional": true
+        },
+        "@vitest/browser-webdriverio": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        },
+        "vite": {
+          "optional": false
+        }
+      }
+    },
+    "node_modules/vitest/node_modules/picomatch": {
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.4.tgz",
+      "integrity": "sha512-QP88BAKvMam/3NxH6vj2o21R6MjxZUAd6nlwAS/pnGvN9IVLocLHxGYIzFhg6fUQ+5th6P4dv4eW9jX3DSIj7A==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/jonschlinkert"
+      }
+    },
     "node_modules/web-push": {
       "version": "3.6.7",
       "resolved": "https://registry.npmjs.org/web-push/-/web-push-3.6.7.tgz",
@@ -16778,6 +17830,23 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/word-wrap": {
       "version": "1.2.5",
       "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
diff --git a/package.json b/package.json
index 2ae4b5a..e947bdb 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,8 @@
     "dev": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "eslint"
+    "lint": "eslint",
+    "test": "vitest run"
   },
   "dependencies": {
     "@ai-sdk/google": "^3.0.53",
@@ -78,6 +79,7 @@
     "shadcn": "^3.8.4",
     "tailwindcss": "^4",
     "tw-animate-css": "^1.4.0",
-    "typescript": "5.7.3"
+    "typescript": "5.7.3",
+    "vitest": "^4.1.2"
   }
 }