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TypeScript
123456789101112131415161718192021222324import { describe, expect, it } from "vitest";import { getAdjacentBadgeIndex } from "./badge-navigation";
describe("getAdjacentBadgeIndex", () => { it("moves between badges in either direction", () => { expect(getAdjacentBadgeIndex(1, 3, 1)).toBe(2); expect(getAdjacentBadgeIndex(1, 3, -1)).toBe(0); });
it("wraps at both ends", () => { expect(getAdjacentBadgeIndex(2, 3, 1)).toBe(0); expect(getAdjacentBadgeIndex(0, 3, -1)).toBe(2); });
it("keeps a single badge selected", () => { expect(getAdjacentBadgeIndex(0, 1, 1)).toBe(0); expect(getAdjacentBadgeIndex(0, 1, -1)).toBe(0); });
it("returns null when there are no badges", () => { expect(getAdjacentBadgeIndex(0, 0, 1)).toBeNull(); });});