import { describe, expect, it } from "vitest"; import { isTransportConnectionErrorMessage, sanitizeThreadErrorMessage } from "./transportError"; describe("transportError", () => {  it("detects websocket transport failures", () => {    expect(isTransportConnectionErrorMessage("SocketCloseError: 1006")).toBe(true);    expect(isTransportConnectionErrorMessage("Unable to connect to the T3 server WebSocket.")).toBe(      true,    );    expect(isTransportConnectionErrorMessage("SocketOpenError: Timeout")).toBe(true);  });   it("preserves non-transport thread errors", () => {    expect(sanitizeThreadErrorMessage("Turn failed")).toBe("Turn failed");    expect(sanitizeThreadErrorMessage("Select a base branch before sending.")).toBe(      "Select a base branch before sending.",    );  });   it("drops transport failures from thread surfaces", () => {    expect(sanitizeThreadErrorMessage("SocketCloseError: 1006")).toBeNull();  });});