test: add normalization coverage for shared and slack allow-list

src/shared/string-normalization.test.ts

@@ -0,0 +1,25 @@
+import { describe, expect, it } from "vitest";
+import {
+  normalizeHyphenSlug,
+  normalizeStringEntries,
+  normalizeStringEntriesLower,
+} from "./string-normalization.js";
+
+describe("shared/string-normalization", () => {
+  it("normalizes mixed allow-list entries", () => {
+    expect(normalizeStringEntries([" a ", 42, "", "  ", "z"])).toEqual(["a", "42", "z"]);
+    expect(normalizeStringEntries(undefined)).toEqual([]);
+  });
+
+  it("normalizes mixed allow-list entries to lowercase", () => {
+    expect(normalizeStringEntriesLower([" A ", "MiXeD", 7])).toEqual(["a", "mixed", "7"]);
+  });
+
+  it("normalizes slug-like labels while preserving supported symbols", () => {
+    expect(normalizeHyphenSlug("  Team Room  ")).toBe("team-room");
+    expect(normalizeHyphenSlug(" #My_Channel + Alerts ")).toBe("#my_channel-+-alerts");
+    expect(normalizeHyphenSlug("..foo---bar..")).toBe("foo-bar");
+    expect(normalizeHyphenSlug(undefined)).toBe("");
+    expect(normalizeHyphenSlug(null)).toBe("");
+  });
+});