Add base32 tests

Author: perry-mitchell

source/index.ts

@@ -1,6 +1,6 @@
 export { isValid, monotonicFactory, ulid } from "./ulid.js";
 export { ulidToUUID, uuidToULID } from "./uuid.js";
-export { fixULIDBase32 } from "./crockford.js";
+export { fixULIDBase32, incrementBase32 } from "./crockford.js";
 export { ULIDError, ULIDErrorCode } from "./error.js";
 export { MAX_ULID, MIN_ULID } from "./constants.js";
 export * from "./types.js";

test/node/crockford.spec.ts

@@ -0,0 +1,22 @@
+import { describe, expect, it } from "vitest";
+import { incrementBase32 } from "../../";
+
+describe("incrementBase32", () => {
+    it("increments correctly", () => {
+        expect(incrementBase32("A109C")).toEqual("A109D");
+    })
+
+    it("carries correctly", () => {
+        expect(incrementBase32("A1YZZ")).toEqual("A1Z00");
+    })
+
+    it("double increments correctly", () => {
+        expect(incrementBase32(incrementBase32("A1YZZ"))).toEqual("A1Z01");
+    })
+
+    it("throws when it cannot increment", () => {
+        expect(() => {
+            incrementBase32("ZZZ")
+        }).toThrow(/B32_ENC_INVALID/);
+    })
+});