runa/vscode/test/protocol.test.ts

import assert from "node:assert/strict";
import test from "node:test";
import { parse } from "lossless-json";
import {
  decodeResponse,
  decodeValue,
  formatSnapshot,
  ProtocolError,
  ReadCommand,
} from "../src/protocol";
import { actor, json, REF } from "./fixtures";

const command: ReadCommand = { operation: "list_actors" };
const envelope = (reply: unknown) =>
  json({ version: 3, request_id: "test", result: { Ok: reply } });

test("v3 snapshots preserve all value variants, i64 limits, u64 telemetry, and mailbox order", () => {
  const snapshot = actor();
  const reply = decodeResponse(envelope({ kind: "actors", data: [snapshot] }), "test", command);
  assert.deepEqual(reply, { kind: "actors", data: [snapshot] });
  const formatted = formatSnapshot(snapshot, "[::1]:3737", "2026-11-03T00:00:00Z", false);
  assert.match(formatted, /9223372036854775807/);
  assert.match(formatted, /-9223372036854775808/);
  assert.match(formatted, /18446744073709551615/);
  assert.deepEqual(parse(formatted, undefined, BigInt), {
    connection: { endpoint: "[::1]:3737", connected: false },
    captured_at: "2026-11-03T00:00:00Z",
    actor: snapshot,
  });
});

test("version, correlation, result, reply kind, and actor identity are checked", () => {
  for (const change of [
    { version: 2 },
    { request_id: "wrong" },
    { result: { Ok: { kind: "actor", data: actor() } } },
    { result: { Ok: {}, Err: {} } },
    { result: {} },
  ]) {
    assert.throws(() =>
      decodeResponse(
        json({
          version: 3,
          request_id: "test",
          result: { Ok: { kind: "actors", data: [] } },
          ...change,
        }),
        "test",
        command,
      ),
    );
  }
  assert.throws(() =>
    decodeResponse(envelope({ kind: "actors", data: [actor(), actor()] }), "test", command),
  );
  assert.throws(() =>
    decodeResponse(envelope({ kind: "actor", data: actor() }), "test", {
      operation: "inspect_actor",
      parameters: { actor_ref: "ABCDEFGHIJKLMNOPQRSTU" },
    }),
  );
});

test("server errors are explicit, typed, and not treated as empty actor lists", () => {
  assert.throws(
    () =>
      decodeResponse(
        json({
          version: 3,
          request_id: "test",
          result: { Err: { code: "not_found", message: "No actor" } },
        }),
        "test",
        command,
      ),
    (error) => error instanceof ProtocolError && error.code === "not_found",
  );
});

test("malformed states and snapshots fail instead of being coerced", () => {
  for (const state of [
    { type: "integer", data: 9223372036854775808n },
    { type: "integer", data: -9223372036854775809n },
    { type: "integer", data: 1.5 },
    { type: "actor_ref", data: "guessable" },
    { type: "string", data: REF, extra: true },
    { type: "null", data: null },
    { type: "float", data: 1 },
  ]) {
    assert.throws(() =>
      decodeResponse(envelope({ kind: "actors", data: [{ ...actor(), state }] }), "test", command),
    );
  }
  for (const change of [
    { status: { status: "unknown" } },
    { status: { status: "failed" } },
    { incarnation: -1 },
    { mailbox_id: 18446744073709551616n },
    { execution: { vm_steps: "20" } },
    { reserved: undefined },
    { queued: null },
    { actor_ref: "@invalid" },
  ]) {
    assert.throws(() =>
      decodeResponse(
        envelope({ kind: "actors", data: [{ ...actor(), ...change }] }),
        "test",
        command,
      ),
    );
  }
});

test("portable value limits have inclusive depth, node, and UTF-8 byte boundaries", () => {
  let nested: unknown = { type: "null" };
  for (let i = 0; i < 32; i++) nested = { type: "list", data: [nested] };
  assert.doesNotThrow(() => decodeValue(nested));
  assert.throws(() => decodeValue({ type: "list", data: [nested] }), /depth/);
  const data = Array.from({ length: 4095 }, () => ({ type: "null" }));
  assert.doesNotThrow(() => decodeValue({ type: "list", data }));
  assert.throws(() => decodeValue({ type: "list", data: [...data, { type: "null" }] }), /node/);
  assert.doesNotThrow(() => decodeValue({ type: "string", data: "é".repeat(524288) }));
  assert.throws(() => decodeValue({ type: "string", data: "é".repeat(524288) + "a" }), /byte/);
});