import { EventEmitter } from "node:events";import { describe, expect, it, vi } from "vitest"; const spawn = vi.fn();const existsSync = vi.fn(); vi.mock("node:child_process", () => ({ spawn }));vi.mock("node:fs", () => ({ existsSync })); type FakeProc = EventEmitter & { kill: () => void }; function fakeProc(code: number): FakeProc {  const proc = new EventEmitter() as FakeProc;  proc.kill = vi.fn();  queueMicrotask(() => proc.emit("close", code));  return proc;} function onPlatform(platform: string): () => void {  const original = process.platform;  Object.defineProperty(process, "platform", { value: platform });  return () => {    Object.defineProperty(process, "platform", { value: original });    vi.resetModules();    spawn.mockReset();    existsSync.mockReset();  };} describe("openFolder", () => {  it("falls back to the next Linux opener when the first fails", async () => {    const restore = onPlatform("linux");    try {      existsSync.mockReturnValue(true);      spawn.mockImplementation((cmd: string) => fakeProc(cmd === "gio" ? 0 : 1));       const { openFolder } = await import("./openFolder");       await expect(openFolder("/home/me/Downloads/torlink")).resolves.toBe(true);      expect(spawn).toHaveBeenCalledWith("xdg-open", ["/home/me/Downloads/torlink"]);      expect(spawn).toHaveBeenCalledWith("gio", ["open", "/home/me/Downloads/torlink"]);    } finally {      restore();    }  });   it("treats explorer's nonzero exit as success on Windows", async () => {    const restore = onPlatform("win32");    try {      existsSync.mockReturnValue(true);      spawn.mockImplementation(() => fakeProc(1));       const { openFolder } = await import("./openFolder");       await expect(openFolder("C:\\Users\\me\\Downloads\\torlink")).resolves.toBe(true);      expect(spawn).toHaveBeenCalledWith("explorer", ["C:\\Users\\me\\Downloads\\torlink"]);    } finally {      restore();    }  });   it("reports failure for a folder that no longer exists, without spawning", async () => {    const restore = onPlatform("win32");    try {      existsSync.mockReturnValue(false);       const { openFolder } = await import("./openFolder");       await expect(openFolder("C:\\gone")).resolves.toBe(false);      expect(spawn).not.toHaveBeenCalled();    } finally {      restore();    }  });});