UXP-Fixed/devtools/server/tests/unit/test_protocolSpec.js

const run_test = Test(function* () {
  initTestDebuggerServer();
  const connection = DebuggerServer.connectPipe();
  const client = Async(new DebuggerClient(connection));

  yield client.connect();

  const response = yield client.request({
    to: "root",
    type: "protocolDescription"
  });

  assert(response.from == "root");
  assert(typeof (response.types) === "object");

  yield client.close();
});