Add tests for base62

Author: nikeee

src/base62.test.ts

@@ -0,0 +1,48 @@
+import { describe, test } from "node:test";
+import { expect } from "expect";
+
+import { decode, encode } from "./base62.ts";
+
+describe("base62 roundtrip", () => {
+	function encodeText(value: string): Uint8Array {
+		return new TextEncoder().encode(value);
+	}
+
+	describe("roundtrip", () => {
+		test("empty string", () => {
+			const s = encode(new Uint8Array());
+			expect(s).toEqual("");
+			expect(decode(s)).toEqual(new Uint8Array());
+		});
+
+		test("bytes 0..255", () => {
+			const data = new Uint8Array(256);
+			for (let i = 0; i < 256; ++i) {
+				data[i] = i;
+			}
+
+			const s = encode(data);
+
+			expect(s).toEqual(
+				"035wZm1edb9RUsMkV3aMFxHKByy8J2aM5Kr1OxrO0hmOBbl8MqLURltuvCSdUydttr0kDH5LJyur4aKPuwfsxqZ0ALf45zQuWteH7IF5ycqRE5mYv5s3iwmE6MyKUHdhAqHAteHCSgmXkPbhxydluUJPsZdhmc8Jfpx2AkFATFLIY11c84EiU86slyiE7aaeBzQEW1rGH2yjb3RyCOFrD2Ol1CAAmSSHZ9VfBmJbqeWev8Awd6QrqF8nDpJQ7IKKxLq81bRPQzxDdy5sebVIHOCAVxlF0dnpB8oNC2rq2h7Z02P679dGKSlV8bWd13mxeGjbVg7L5nxLrZKqRzdn27z",
+			);
+			expect(decode(s)).toEqual(data);
+		});
+
+		test("encode simple text", () => {
+			const data = encodeText("abc");
+			const s = encode(data);
+
+			expect(s).toEqual("QmIN");
+			expect(decode(s)).toEqual(data);
+		});
+
+		test("encode zeros prefix", () => {
+			const data = new Uint8Array([0, 0, 1, 2, 3]);
+			const s = encode(data);
+
+			expect(s).toEqual("00HBL");
+			expect(decode(s)).toEqual(data);
+		});
+	});
+});