first commit

packages/pubsub/test/resp.test.ts

@@ -0,0 +1,51 @@
+import { test, expect } from "bun:test";
+import { encodeCommand, parseReply, concat } from "../src/resp.ts";
+
+const enc = new TextEncoder();
+const dec = new TextDecoder();
+
+test("encodeCommand produces a RESP array of bulk strings", () => {
+  const bytes = encodeCommand(["PUBLISH", "order:created", '{"id":7}']);
+  expect(dec.decode(bytes)).toBe(
+    '*3\r\n$7\r\nPUBLISH\r\n$13\r\norder:created\r\n$8\r\n{"id":7}\r\n',
+  );
+});
+
+test("parseReply reads a Redis message push", () => {
+  const wire = enc.encode("*3\r\n$7\r\nmessage\r\n$5\r\ntopic\r\n$5\r\nhello\r\n");
+  const r = parseReply(wire);
+  expect(r).not.toBeNull();
+  expect(r!.value).toEqual(["message", "topic", "hello"]);
+  expect(r!.next).toBe(wire.length);
+});
+
+test("parseReply reads a pmessage push (pattern, channel, payload)", () => {
+  const wire = enc.encode(
+    "*4\r\n$8\r\npmessage\r\n$6\r\norder:*\r\n$13\r\norder:created\r\n$2\r\n{}\r\n".replace(
+      "$6\r\norder:*",
+      "$7\r\norder:*",
+    ),
+  );
+  const r = parseReply(wire)!;
+  expect(r.value).toEqual(["pmessage", "order:*", "order:created", "{}"]);
+});
+
+test("parseReply returns null for an incomplete buffer, then completes", () => {
+  const full = enc.encode("*1\r\n$5\r\nhello\r\n");
+  // Half the bytes → incomplete.
+  expect(parseReply(full.subarray(0, 8))).toBeNull();
+  // Full → parses.
+  expect(parseReply(full)!.value).toEqual(["hello"]);
+});
+
+test("parseReply handles integers and simple strings (subscribe confirmations)", () => {
+  const sub = enc.encode("*3\r\n$9\r\nsubscribe\r\n$5\r\ntopic\r\n:1\r\n");
+  expect(parseReply(sub)!.value).toEqual(["subscribe", "topic", 1]);
+  const ok = enc.encode("+OK\r\n");
+  expect(parseReply(ok)!.value).toBe("OK");
+});
+
+test("concat joins byte chunks in order", () => {
+  const joined = concat([enc.encode("ab"), enc.encode("cd")]);
+  expect(dec.decode(joined)).toBe("abcd");
+});