1 files changed, 28 insertions, 0 deletions
diff --git a/src/lib/logic/normalize.test.js b/src/lib/logic/normalize.test.js
new file mode 100644
index 0000000..418e427
--- /dev/null
+++ b/src/lib/logic/normalize.test.js
@@ -0,0 +1,28 @@
+import { describe, it, expect } from "vitest";
+import { normalize } from "./normalize.js";
+
+describe("normalize", () => {
+  it("collapses all levels into one bucket when factor equals the max level (\"All Levels\")", () => {
+    const players = [{ level: 1 }, { level: 5 }, { level: 10 }];
+    const result = normalize(players, 10);
+    expect(result.map((p) => p.level)).toEqual([1, 1, 1]);
+  });
+
+  it("leaves levels untouched when factor is 1 (\"Skill Based\")", () => {
+    const players = [{ level: 1 }, { level: 5 }, { level: 10 }];
+    const result = normalize(players, 1);
+    expect(result.map((p) => p.level)).toEqual([1, 5, 10]);
+  });
+
+  it("splits levels into two buckets when factor is 5 (\"2 Levels\")", () => {
+    const players = [{ level: 1 }, { level: 5 }, { level: 6 }, { level: 10 }];
+    const result = normalize(players, 5);
+    expect(result.map((p) => p.level)).toEqual([1, 1, 2, 2]);
+  });
+
+  it("does not mutate the input array", () => {
+    const players = [{ level: 4 }];
+    normalize(players, 2);
+    expect(players[0].level).toBe(4);
+  });
+});