function expectRespondPayload(respond: MockCalls): Record<string, unknown> {

expect(respond.mock.calls).toHaveLength(1);

const [ok, payload, error] = respond.mock.calls.at(0) ?? [];

const [ok, payload, error] = respond.mock.calls[0] ?? [];

expect(ok).toBe(true);

expect(error).toBeUndefined();

return requireRecord(payload, "response payload");

expected: Record<string, unknown>,

): Record<string, unknown> {

expect(broadcastToConnIds.mock.calls).toHaveLength(1);

const [event, payload, connIds, options] = broadcastToConnIds.mock.calls.at(0) ?? [];

const [event, payload, connIds, options] = broadcastToConnIds.mock.calls[0] ?? [];

expect(event).toBe("sessions.changed");

expect(connIds).toEqual(new Set(["conn-1"]));

expect(options).toEqual({ dropIfSlow: true });