api/services/edge-broker/test/broker.test.mjs

import test from "node:test";
import assert from "node:assert/strict";
import net from "node:net";
import WebSocket from "ws";

import { createBrokerServer } from "../server.mjs";

function collectMessages(socket) {
  const messages = [];
  socket.on("message", (raw) => {
    messages.push(JSON.parse(raw.toString()));
  });
  return messages;
}

function waitForClose(socket) {
  return new Promise((resolve) => {
    socket.once("close", resolve);
  });
}

function rawUpgradeRequest(port, path) {
  return new Promise((resolve, reject) => {
    const socket = net.createConnection({ host: "127.0.0.1", port }, () => {
      socket.write(
        [
          `GET ${path} HTTP/1.1`,
          `Host: 127.0.0.1:${port}`,
          "Connection: Upgrade",
          "Upgrade: websocket",
          "Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==",
          "Sec-WebSocket-Version: 13",
          "",
          "",
        ].join("\r\n")
      );
    });
    let response = "";
    socket.setEncoding("utf8");
    socket.on("data", (chunk) => {
      response += chunk;
    });
    socket.on("end", () => resolve(response));
    socket.on("error", reject);
  });
}

async function waitFor(predicate, { timeoutMs = 1000, intervalMs = 10, description = "condition" } = {}) {
  const deadline = Date.now() + timeoutMs;

  while (Date.now() < deadline) {
    if (predicate()) {
      return;
    }

    await new Promise((resolve) => setTimeout(resolve, intervalMs));
  }

  throw new Error(`Timed out waiting for ${description}`);
}

test("broker defaults to manager auth and fails closed when manager URL is missing", async () => {
  const previousEnv = {
    EDGE_AUTH_MODE: process.env.EDGE_AUTH_MODE,
    EDGE_MANAGER_URL: process.env.EDGE_MANAGER_URL,
    EDGE_PUBLIC_API_URL: process.env.EDGE_PUBLIC_API_URL,
  };
  delete process.env.EDGE_AUTH_MODE;
  delete process.env.EDGE_MANAGER_URL;
  delete process.env.EDGE_PUBLIC_API_URL;

  let broker;
  try {
    broker = createBrokerServer({ sharedSecret: "secret" });
    assert.equal(broker.state.authMode, "manager");
    assert.equal(broker.state.managerUrl, "");

    const address = await broker.listen(0);
    const port = address.port;
    const shellResponse = await rawUpgradeRequest(port, "/ws/browser-shell?token=session-token");
    const agentResponse = await rawUpgradeRequest(port, "/ws/agent?gatewayId=701&token=agent-token");

    assert.doesNotMatch(shellResponse, /101 Switching Protocols/);
    assert.match(shellResponse, /^HTTP\/1\.1 401 Unauthorized/m);
    assert.match(shellResponse, /"error_code":"shell_session_invalid"/);
    assert.match(shellResponse, /Edge manager URL is not configured/);

    assert.doesNotMatch(agentResponse, /101 Switching Protocols/);
    assert.match(agentResponse, /^HTTP\/1\.1 503 Service Unavailable/m);
    assert.match(agentResponse, /"error_code":"agent_validation_failed"/);
    assert.match(agentResponse, /"stage":"agent_validate"/);
    assert.match(agentResponse, /Edge manager URL is not configured/);
  } finally {
    if (broker) {
      await broker.close();
    }
    for (const [key, value] of Object.entries(previousEnv)) {
      if (value === undefined) {
        delete process.env[key];
      } else {
        process.env[key] = value;
      }
    }
  }
});

test("broker dispatches commands to connected agents", async () => {
  const broker = createBrokerServer({ authMode: "stub", sharedSecret: "secret", commandTimeoutMs: 2000 });
  const address = await broker.listen(0);
  const port = address.port;
  const agent = new WebSocket(`ws://127.0.0.1:${port}/ws/agent?gatewayId=701&token=agent-token`);

  await new Promise((resolve) => agent.once("open", resolve));
  agent.on("message", (raw) => {
    const message = JSON.parse(raw.toString());
    if (message.type === "COMMAND") {
      agent.send(JSON.stringify({
        type: "COMMAND_RESULT",
        commandId: message.commandId,
        ok: true,
        payload: { online: true, on: true },
      }));
    }
  });

  const response = await fetch(`http://127.0.0.1:${port}/api/gateways/701/commands`, {
    method: "POST",
    headers: {
      "content-type": "application/json",
      "x-edge-broker-secret": "secret",
    },
    body: JSON.stringify({
      commandType: "GET_RELAY_STATUS",
      payload: { relayId: "M-7" },
    }),
  });
  const json = await response.json();

  assert.equal(response.status, 200);
  assert.equal(json.ok, true);
  assert.equal(json.payload.on, true);

  agent.terminate();
  await broker.close();
});

test("broker exposes health and shared-secret diagnostics", async () => {
  const broker = createBrokerServer({ authMode: "manager", sharedSecret: "secret", managerUrl: "http://manager.test" });
  const address = await broker.listen(0);
  const port = address.port;

  const healthResponse = await fetch(`http://127.0.0.1:${port}/api/health`);
  const healthJson = await healthResponse.json();

  assert.equal(healthResponse.status, 200);
  assert.equal(healthJson.ok, true);
  assert.equal(healthJson.service, "edge-broker");
  assert.equal(healthJson.auth_mode, "manager");
  assert.equal(healthJson.manager_url_configured, true);
  assert.equal(healthJson.shared_secret_configured, true);

  const invalidSecretResponse = await fetch(`http://127.0.0.1:${port}/api/diagnostics/shared-secret`, {
    method: "POST",
    headers: {
      "x-edge-broker-secret": "wrong-secret",
    },
  });
  const invalidSecretJson = await invalidSecretResponse.json();

  assert.equal(invalidSecretResponse.status, 403);
  assert.equal(invalidSecretJson.ok, false);
  assert.equal(invalidSecretJson.shared_secret_required, true);

  const validSecretResponse = await fetch(`http://127.0.0.1:${port}/api/diagnostics/shared-secret`, {
    method: "POST",
    headers: {
      "x-edge-broker-secret": "secret",
    },
  });
  const validSecretJson = await validSecretResponse.json();

  assert.equal(validSecretResponse.status, 200);
  assert.equal(validSecretJson.ok, true);
  assert.equal(validSecretJson.shared_secret_required, true);

  await broker.close();
});

test("broker bridges browser shell sessions through the connected agent", async () => {
  const closedSessions = [];
  const broker = createBrokerServer({
    authMode: "stub",
    validateShellSession: async () => ({ id: "shell-1", gateway_id: "701", reason: "diagnostic" }),
    closeShellSession: async (_id, _token, transcript, reason) => {
      closedSessions.push({ transcript, reason });
    },
  });
  const address = await broker.listen(0);
  const port = address.port;

  const agent = new WebSocket(`ws://127.0.0.1:${port}/ws/agent?gatewayId=701&token=agent-token`);
  await new Promise((resolve) => agent.once("open", resolve));

  agent.on("message", (raw) => {
    const message = JSON.parse(raw.toString());
    if (message.type === "OPEN_ROOT_SHELL") {
      agent.send(JSON.stringify({ type: "SHELL_OPENED", sessionId: "shell-1" }));
      agent.send(JSON.stringify({ type: "SHELL_OUTPUT", sessionId: "shell-1", data: "root@pi:~# " }));
      agent.send(JSON.stringify({ type: "SHELL_EXIT", sessionId: "shell-1", code: 0 }));
    }
  });

  const browser = new WebSocket(`ws://127.0.0.1:${port}/ws/browser-shell?token=session-token`);
  const browserMessages = collectMessages(browser);
  await new Promise((resolve) => browser.once("open", resolve));
  await new Promise((resolve) => setTimeout(resolve, 100));

  assert.ok(browserMessages.some((message) => message.type === "opened"));
  assert.ok(browserMessages.some((message) => message.type === "output" && /root@pi/.test(message.data)));
  assert.ok(browserMessages.some((message) => message.type === "closed" && message.reason === "agent_exit" && message.code === 0));
  assert.equal(closedSessions.length, 1);
  assert.equal(closedSessions[0].reason, "agent_exit");

  browser.terminate();
  agent.terminate();
  await broker.close();
});

test("broker forwards browser shell input, resize, and close events to the agent", async () => {
  const broker = createBrokerServer({
    authMode: "stub",
    validateShellSession: async () => ({ id: "shell-2", gateway_id: "701", reason: "diagnostic" }),
  });
  const address = await broker.listen(0);
  const port = address.port;

  const agent = new WebSocket(`ws://127.0.0.1:${port}/ws/agent?gatewayId=701&token=agent-token`);
  await new Promise((resolve) => agent.once("open", resolve));

  const agentMessages = collectMessages(agent);
  const browser = new WebSocket(`ws://127.0.0.1:${port}/ws/browser-shell?token=session-token`);
  await new Promise((resolve) => browser.once("open", resolve));
  await waitFor(
    () => agentMessages.some((message) => message.type === "OPEN_ROOT_SHELL" && message.payload.sessionId === "shell-2"),
    { description: "agent shell open request" }
  );

  browser.send(JSON.stringify({ type: "input", data: "ls\r" }));
  browser.send(JSON.stringify({ type: "resize", cols: 140, rows: 44 }));
  browser.send(JSON.stringify({ type: "close" }));
  await new Promise((resolve) => setTimeout(resolve, 50));

  assert.ok(agentMessages.some((message) => message.type === "OPEN_ROOT_SHELL" && message.payload.sessionId === "shell-2"));
  assert.ok(
    agentMessages.some(
      (message) =>
        message.type === "SHELL_INPUT" &&
        message.payload.sessionId === "shell-2" &&
        message.payload.data === "ls\r"
    )
  );
  assert.ok(
    agentMessages.some(
      (message) =>
        message.type === "RESIZE_ROOT_SHELL" &&
        message.payload.sessionId === "shell-2" &&
        message.payload.cols === 140 &&
        message.payload.rows === 44
    )
  );
  assert.ok(agentMessages.some((message) => message.type === "CLOSE_ROOT_SHELL" && message.payload.sessionId === "shell-2"));

  browser.terminate();
  agent.terminate();
  await broker.close();
});

test("broker closes browser shell sessions immediately when no agent is connected", async () => {
  const closedSessions = [];
  const broker = createBrokerServer({
    authMode: "stub",
    validateShellSession: async () => ({ id: "shell-3", gateway_id: "701", reason: "diagnostic" }),
    closeShellSession: async (_id, _token, transcript, reason) => {
      closedSessions.push({ transcript, reason });
    },
  });
  const address = await broker.listen(0);
  const port = address.port;

  const browser = new WebSocket(`ws://127.0.0.1:${port}/ws/browser-shell?token=session-token`);
  const browserMessages = collectMessages(browser);
  await new Promise((resolve) => browser.once("open", resolve));
  await waitForClose(browser);
  await waitFor(() => closedSessions.length === 1, { description: "offline shell session close callback" });

  assert.ok(
    browserMessages.some(
      (message) =>
        message.type === "closed" &&
        message.reason === "agent_offline" &&
        /not connected to the broker/i.test(message.message)
    )
  );
  assert.deepEqual(closedSessions, [{ transcript: "", reason: "agent_offline" }]);

  await broker.close();
});

test("broker rejects browser shell upgrades without a token using HTTP diagnostics", async () => {
  const broker = createBrokerServer({ authMode: "stub" });
  const address = await broker.listen(0);
  const port = address.port;

  const response = await rawUpgradeRequest(port, "/ws/browser-shell");

  assert.match(response, /^HTTP\/1\.1 400 Bad Request/m);
  assert.match(response, /"error_code":"shell_session_token_missing"/);
  assert.match(response, /"message":"Missing shell session token\."/);

  await broker.close();
});

test("broker rejects invalid browser shell upgrades without leaking the token", async () => {
  const broker = createBrokerServer({
    authMode: "stub",
    validateShellSession: async () => {
      const error = new Error("Shell session expired");
      error.status = 401;
      error.code = "shell_session_expired";
      throw error;
    },
  });
  const address = await broker.listen(0);
  const port = address.port;
  const rawToken = "session-token-secret";

  const response = await rawUpgradeRequest(port, `/ws/browser-shell?token=${rawToken}`);

  assert.match(response, /^HTTP\/1\.1 401 Unauthorized/m);
  assert.match(response, /"error_code":"shell_session_expired"/);
  assert.doesNotMatch(response, new RegExp(rawToken));

  await broker.close();
});

test("broker closes browser shell sessions when the agent never reports shell opened", async () => {
  const closedSessions = [];
  const broker = createBrokerServer({
    authMode: "stub",
    shellOpenTimeoutMs: 30,
    validateShellSession: async () => ({ id: "shell-timeout", gateway_id: "701", reason: "diagnostic" }),
    closeShellSession: async (_id, _token, transcript, reason, details) => {
      closedSessions.push({ transcript, reason, details });
    },
  });
  const address = await broker.listen(0);
  const port = address.port;

  const agent = new WebSocket(`ws://127.0.0.1:${port}/ws/agent?gatewayId=701&token=agent-token`);
  const agentMessages = collectMessages(agent);
  await new Promise((resolve) => agent.once("open", resolve));

  const browser = new WebSocket(`ws://127.0.0.1:${port}/ws/browser-shell?token=session-token`);
  const browserMessages = collectMessages(browser);
  await new Promise((resolve) => browser.once("open", resolve));

  await waitFor(
    () =>
      agentMessages.some(
        (message) => message.type === "OPEN_ROOT_SHELL" && message.payload.sessionId === "shell-timeout"
      ),
    { description: "agent shell open request before timeout" }
  );
  await waitForClose(browser);
  await waitFor(() => closedSessions.length === 1, { description: "timeout shell session close callback" });

  assert.ok(browserMessages.some((message) => message.type === "closed" && message.reason === "shell_open_timeout"));
  assert.equal(closedSessions[0].reason, "shell_open_timeout");
  assert.equal(closedSessions[0].details.stage, "shell_open");
  assert.equal(closedSessions[0].details.code, 1011);

  agent.terminate();
  await broker.close();
});

test("broker closes browser shell sessions when the agent disconnects before shell open", async () => {
  const closedSessions = [];
  const broker = createBrokerServer({
    authMode: "stub",
    validateShellSession: async () => ({ id: "shell-4", gateway_id: "701", reason: "diagnostic" }),
    closeShellSession: async (_id, _token, transcript, reason) => {
      closedSessions.push({ transcript, reason });
    },
  });
  const address = await broker.listen(0);
  const port = address.port;

  const agent = new WebSocket(`ws://127.0.0.1:${port}/ws/agent?gatewayId=701&token=agent-token`);
  await new Promise((resolve) => agent.once("open", resolve));

  const agentMessages = collectMessages(agent);
  const browser = new WebSocket(`ws://127.0.0.1:${port}/ws/browser-shell?token=session-token`);
  const browserMessages = collectMessages(browser);
  await new Promise((resolve) => browser.once("open", resolve));
  await waitFor(
    () => agentMessages.some((message) => message.type === "OPEN_ROOT_SHELL" && message.payload.sessionId === "shell-4"),
    { description: "agent shell open request before disconnect" }
  );

  agent.terminate();
  await waitForClose(browser);
  await waitFor(() => closedSessions.length === 1, { description: "disconnect shell session close callback" });

  assert.ok(agentMessages.some((message) => message.type === "OPEN_ROOT_SHELL" && message.payload.sessionId === "shell-4"));
  assert.ok(browserMessages.some((message) => message.type === "closed" && message.reason === "agent_disconnected"));
  assert.deepEqual(closedSessions, [{ transcript: "", reason: "agent_disconnected" }]);

  await broker.close();
});

test("broker sends an agent welcome before connection progress and backlog dispatch", async () => {
  const broker = createBrokerServer({
    authMode: "stub",
    reportGatewayPresence: async () => ({}),
    requestGatewayBacklog: async () => ({
      dispatch: [
        {
          type: "TASK_DISPATCH",
          taskType: "OPERATION",
          operation: {
            id: 91,
            type: "DISCOVERY",
            request: {},
          },
        },
      ],
    }),
  });
  const address = await broker.listen(0);
  const port = address.port;

  const agent = new WebSocket(`ws://127.0.0.1:${port}/ws/agent?gatewayId=701&token=agent-token`);
  const messages = collectMessages(agent);
  await new Promise((resolve) => agent.once("open", resolve));

  await waitFor(
    () => messages.some((message) => message.type === "TASK_DISPATCH" && message.operation?.id === 91),
    { description: "backlog dispatch after connection welcome" }
  );

  assert.equal(messages[0].type, "WELCOME");
  assert.equal(messages[0].gatewayId, "701");
  assert.equal(typeof messages[0].connectionId, "string");
  assert.ok(messages[0].connectionId.length > 0);

  const firstProgressIndex = messages.findIndex((message) => message.type === "CONNECTION_PROGRESS");
  const dispatchIndex = messages.findIndex((message) => message.type === "TASK_DISPATCH");
  assert.ok(firstProgressIndex > 0);
  assert.ok(dispatchIndex > firstProgressIndex);
  assert.ok(
    messages.some(
      (message) =>
        message.type === "CONNECTION_PROGRESS" &&
        message.stage === "presence" &&
        message.status === "started"
    )
  );
  assert.ok(
    messages.some(
      (message) =>
        message.type === "CONNECTION_PROGRESS" &&
        message.stage === "backlog" &&
        message.status === "started"
    )
  );
  assert.ok(
    messages.some(
      (message) =>
        message.type === "CONNECTION_PROGRESS" &&
        message.stage === "backlog" &&
        message.status === "succeeded" &&
        message.dispatchCount === 1
    )
  );

  agent.terminate();
  await broker.close();
});

test("broker sends connection errors to agents after the welcome message", async () => {
  const broker = createBrokerServer({
    authMode: "stub",
    reportGatewayPresence: async () => {
      throw new Error("presence callback unavailable");
    },
    requestGatewayBacklog: async () => {
      throw new Error("backlog sync unavailable");
    },
  });
  const address = await broker.listen(0);
  const port = address.port;

  const agent = new WebSocket(`ws://127.0.0.1:${port}/ws/agent?gatewayId=701&token=agent-token`);
  const messages = collectMessages(agent);
  await new Promise((resolve) => agent.once("open", resolve));

  await waitFor(
    () => messages.filter((message) => message.type === "CONNECTION_ERROR").length >= 2,
    { description: "agent connection error notifications" }
  );

  assert.equal(messages[0].type, "WELCOME");
  assert.ok(
    messages.some(
      (message) =>
        message.type === "CONNECTION_ERROR" &&
        message.stage === "presence" &&
        message.error === "presence callback unavailable"
    )
  );
  assert.ok(
    messages.some(
      (message) =>
        message.type === "CONNECTION_ERROR" &&
        message.stage === "backlog" &&
        message.error === "backlog sync unavailable"
    )
  );

  agent.terminate();
  await broker.close();
});

test("broker syncs queued gateway backlog on agent connect and manual sync", async () => {
  const backlogRequests = [];
  const broker = createBrokerServer({
    authMode: "stub",
    sharedSecret: "secret",
    requestGatewayBacklog: async (gatewayId, payload) => {
      backlogRequests.push({ gatewayId, payload });
      return {
        dispatch: [
          {
            type: "TASK_DISPATCH",
            taskType: "OPERATION",
            operation: {
              id: 91,
              type: "DISCOVERY",
              request: {},
            },
          },
        ],
      };
    },
  });
  const address = await broker.listen(0);
  const port = address.port;

  const agent = new WebSocket(
    `ws://127.0.0.1:${port}/ws/agent?gatewayId=701&token=agent-token&agentInstanceId=instance-1`
  );
  const messages = collectMessages(agent);
  await new Promise((resolve) => agent.once("open", resolve));

  await waitFor(
    () => messages.some((message) => message.type === "TASK_DISPATCH" && message.operation?.id === 91),
    { description: "initial backlog dispatch" }
  );
  assert.equal(backlogRequests.length, 1);
  assert.equal(backlogRequests[0].gatewayId, "701");
  assert.equal(backlogRequests[0].payload.agent_instance_id, "instance-1");

  const response = await fetch(`http://127.0.0.1:${port}/api/gateways/701/sync`, {
    method: "POST",
    headers: {
      "content-type": "application/json",
      "x-edge-broker-secret": "secret",
    },
    body: JSON.stringify({ gatewayId: 701 }),
  });
  const json = await response.json();

  assert.equal(response.status, 200);
  assert.equal(json.ok, true);
  await waitFor(() => backlogRequests.length >= 2, { description: "manual sync backlog request" });

  agent.terminate();
  await broker.close();
});

test("broker fans out telemetry, task, log, and presence updates to browser gateway streams", async () => {
  const telemetryPayloads = [];
  const broker = createBrokerServer({
    authMode: "stub",
    validateAgent: async () => ({ id: "701", gateway_id: "701", label: "CPH Edge 01" }),
    validateBrowserStream: async () => ({
      id: "stream-1",
      gateway_id: "701",
      scopes: ["overview", "tasks", "logs", "statistics"],
    }),
    ingestTelemetry: async (_gatewayId, payload) => {
      telemetryPayloads.push(payload);
      return { gateway: { id: 701, metadata: payload.metadata || {} } };
    },
    ingestTaskEvent: async (_gatewayId, operationId, payload) => ({
      id: operationId,
      status: "IN_PROGRESS",
      latest_event: payload,
    }),
    ingestLogEntry: async (_gatewayId, payload) => ({
      id: 5001,
      ...payload,
    }),
  });
  const address = await broker.listen(0);
  const port = address.port;

  const browser = new WebSocket(`ws://127.0.0.1:${port}/ws/browser-gateway-stream?token=stream-token`);
  const browserMessages = collectMessages(browser);
  await new Promise((resolve) => browser.once("open", resolve));

  const agent = new WebSocket(`ws://127.0.0.1:${port}/ws/agent?gatewayId=701&token=agent-token`);
  await new Promise((resolve) => agent.once("open", resolve));

  agent.send(
    JSON.stringify({
      type: "TELEMETRY",
      payload: {
        status: "ONLINE",
        metadata: {
          broker_connected: true,
        },
      },
    })
  );
  agent.send(
    JSON.stringify({
      type: "TASK_EVENT",
      operationId: 41,
      payload: {
        level: "INFO",
        code: "DISCOVERY_RUNNING",
        message: "Discovery is running",
      },
    })
  );
  agent.send(
    JSON.stringify({
      type: "LOG_FRAME",
      payload: {
        level: "INFO",
        stream: "agent",
        source: "EDGE_AGENT",
        message: "Gateway heartbeat acknowledged",
      },
    })
  );

  await waitFor(
    () => browserMessages.some((message) => message.type === "presence.changed" && message.status === "connected"),
    { description: "presence update" }
  );
  assert.ok(browserMessages.some((message) => message.type === "gateway.telemetry"));
  assert.ok(browserMessages.some((message) => message.type === "stats.updated"));
  assert.ok(browserMessages.some((message) => message.type === "task.updated" && message.operationId === 41));
  assert.ok(browserMessages.some((message) => message.type === "log.append" && /heartbeat/.test(message.entry?.message)));
  assert.equal(telemetryPayloads[0]?.broker_connection_id?.length > 0, true);

  browser.terminate();
  agent.terminate();
  await broker.close();
});

test("broker survives telemetry ingestion failures for stale gateways", async () => {
  const broker = createBrokerServer({
    authMode: "stub",
    validateAgent: async () => ({ id: "701", gateway_id: "701", label: "CPH Edge 01" }),
    ingestTelemetry: async () => {
      throw new Error("Edge gateway not found");
    },
  });
  const address = await broker.listen(0);
  const port = address.port;

  const agent = new WebSocket(`ws://127.0.0.1:${port}/ws/agent?gatewayId=701&token=agent-token`);
  await new Promise((resolve) => agent.once("open", resolve));

  agent.send(
    JSON.stringify({
      type: "TELEMETRY",
      payload: {
        status: "ONLINE",
      },
    })
  );

  await new Promise((resolve) => setTimeout(resolve, 100));
  assert.equal(broker.server.listening, true);

  agent.terminate();
  await broker.close();
});

test("broker still fans out telemetry when manager ingestion fails", async () => {
  const broker = createBrokerServer({
    authMode: "stub",
    validateAgent: async () => ({ id: "701", gateway_id: "701", label: "CPH Edge 01" }),
    validateBrowserStream: async () => ({
      id: "stream-telemetry-fallback",
      gateway_id: "701",
      scopes: ["overview", "statistics"],
    }),
    ingestTelemetry: async () => {
      throw new Error("manager unavailable");
    },
  });
  const address = await broker.listen(0);
  const port = address.port;

  const browser = new WebSocket(`ws://127.0.0.1:${port}/ws/browser-gateway-stream?token=stream-token`);
  const browserMessages = collectMessages(browser);
  await new Promise((resolve) => browser.once("open", resolve));

  const agent = new WebSocket(`ws://127.0.0.1:${port}/ws/agent?gatewayId=701&token=agent-token`);
  await new Promise((resolve) => agent.once("open", resolve));

  agent.send(
    JSON.stringify({
      type: "TELEMETRY",
      payload: {
        status: "ONLINE",
        metadata: {
          system_metrics: {
            cpu_usage_pct: 31,
          },
          container_health: {
            state: "ONLINE",
            summary: "6/6 containers healthy",
          },
        },
      },
    })
  );

  await waitFor(
    () => browserMessages.some((message) => message.type === "gateway.telemetry" && message.error === "manager unavailable"),
    { description: "telemetry fanout after ingest failure" }
  );
  assert.ok(
    browserMessages.some(
      (message) => message.type === "stats.updated" && message.statistics?.system_metrics?.cpu_usage_pct === 31
    )
  );

  browser.terminate();
  agent.terminate();
  await broker.close();
});