Implement portfolio admin management

tests/array.test.ts

@@ -0,0 +1,15 @@
+import { describe, expect, it } from "vitest";
+
+import { moveArrayItem } from "../lib/array";
+
+describe("moveArrayItem", () => {
+  it("moves an item to a new position", () => {
+    expect(moveArrayItem(["a", "b", "c"], 0, 2)).toEqual(["b", "c", "a"]);
+  });
+
+  it("returns the original order when the move is invalid", () => {
+    expect(moveArrayItem(["a", "b", "c"], -1, 2)).toEqual(["a", "b", "c"]);
+    expect(moveArrayItem(["a", "b", "c"], 1, 1)).toEqual(["a", "b", "c"]);
+    expect(moveArrayItem(["a", "b", "c"], 1, 5)).toEqual(["a", "b", "c"]);
+  });
+});