import fs from "node:fs";import os from "node:os";import path from "node:path"; import { afterEach, describe, expect, it } from "vitest"; import { ensureNodePtySpawnHelperExecutable } from "./ptyAdapter"; function fileMode(filePath: string): number {  return fs.statSync(filePath).mode & 0o777;} describe("ensureNodePtySpawnHelperExecutable", () => {  const tempDirs: string[] = [];   afterEach(() => {    for (const dir of tempDirs.splice(0, tempDirs.length)) {      fs.rmSync(dir, { recursive: true, force: true });    }  });   it("adds executable bits when helper exists but is not executable", () => {    if (process.platform === "win32") return;     const dir = fs.mkdtempSync(path.join(os.tmpdir(), "pty-helper-test-"));    tempDirs.push(dir);    const helperPath = path.join(dir, "spawn-helper");    fs.writeFileSync(helperPath, "#!/bin/sh\nexit 0\n", "utf8");    fs.chmodSync(helperPath, 0o644);     ensureNodePtySpawnHelperExecutable(helperPath);     expect(fileMode(helperPath) & 0o111).toBe(0o111);  });   it("keeps executable helper as executable", () => {    if (process.platform === "win32") return;     const dir = fs.mkdtempSync(path.join(os.tmpdir(), "pty-helper-test-"));    tempDirs.push(dir);    const helperPath = path.join(dir, "spawn-helper");    fs.writeFileSync(helperPath, "#!/bin/sh\nexit 0\n", "utf8");    fs.chmodSync(helperPath, 0o755);     ensureNodePtySpawnHelperExecutable(helperPath);     expect(fileMode(helperPath) & 0o111).toBe(0o111);  });   it("does not throw when helper path is missing", () => {    const missing = path.join(os.tmpdir(), `does-not-exist-${Date.now()}`);    expect(() => ensureNodePtySpawnHelperExecutable(missing)).not.toThrow();  });});