test: add nanoid URL-safe format tests (133 tests)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: alexandre-mrt

tests/nanoid-format.test.ts

@@ -0,0 +1,16 @@
+import { describe, expect, test } from "bun:test";
+import { nanoid } from "nanoid";
+
+describe("nanoid format for drop IDs", () => {
+	test("custom length produces exact size", () => {
+		expect(nanoid(10).length).toBe(10);
+		expect(nanoid(21).length).toBe(21);
+	});
+
+	test("only contains URL-safe chars", () => {
+		for (let i = 0; i < 50; i++) {
+			const id = nanoid(10);
+			expect(id).toMatch(/^[A-Za-z0-9_-]+$/);
+		}
+	});
+});