import { afterEach, beforeEach, describe, expect, test, vi } from "@effect/vitest";import { join } from "node:path"; import { xdgDataHome } from "./index"; const ENV_KEYS = ["XDG_DATA_HOME", "LOCALAPPDATA", "APPDATA", "USERPROFILE", "HOME"] as const; function stubPlatform(platform: NodeJS.Platform) {  Object.defineProperty(process, "platform", { value: platform, configurable: true });} function clearEnv() {  for (const key of ENV_KEYS) vi.stubEnv(key, "");} describe("xdgDataHome", () => {  const originalPlatform = process.platform;   beforeEach(() => {    clearEnv();  });   afterEach(() => {    vi.unstubAllEnvs();    Object.defineProperty(process, "platform", {      value: originalPlatform,      configurable: true,    });  });   test("prefers XDG_DATA_HOME when set on any platform", () => {    vi.stubEnv("XDG_DATA_HOME", "/custom/xdg");    stubPlatform("linux");    expect(xdgDataHome()).toBe("/custom/xdg");    stubPlatform("win32");    expect(xdgDataHome()).toBe("/custom/xdg");    stubPlatform("darwin");    expect(xdgDataHome()).toBe("/custom/xdg");  });   test("ignores empty / whitespace-only XDG_DATA_HOME", () => {    vi.stubEnv("XDG_DATA_HOME", "   ");    vi.stubEnv("HOME", "/home/user");    stubPlatform("linux");    expect(xdgDataHome()).toBe(join("/home/user", ".local", "share"));  });   test("trims whitespace around XDG_DATA_HOME", () => {    vi.stubEnv("XDG_DATA_HOME", "  /trimmed/xdg  ");    stubPlatform("linux");    expect(xdgDataHome()).toBe("/trimmed/xdg");  });   describe("on posix", () => {    beforeEach(() => stubPlatform("linux"));     test("falls back to $HOME/.local/share", () => {      vi.stubEnv("HOME", "/home/user");      expect(xdgDataHome()).toBe(join("/home/user", ".local", "share"));    });     test("defaults to ~/.local/share when HOME is unset", () => {      expect(xdgDataHome()).toBe(join("~", ".local", "share"));    });  });   describe("on windows", () => {    beforeEach(() => stubPlatform("win32"));     test("prefers LOCALAPPDATA", () => {      vi.stubEnv("LOCALAPPDATA", "C:\\Users\\user\\AppData\\Local");      vi.stubEnv("APPDATA", "C:\\Users\\user\\AppData\\Roaming");      vi.stubEnv("USERPROFILE", "C:\\Users\\user");      expect(xdgDataHome()).toBe("C:\\Users\\user\\AppData\\Local");    });     test("falls back to APPDATA when LOCALAPPDATA is unset", () => {      vi.stubEnv("APPDATA", "C:\\Users\\user\\AppData\\Roaming");      vi.stubEnv("USERPROFILE", "C:\\Users\\user");      expect(xdgDataHome()).toBe("C:\\Users\\user\\AppData\\Roaming");    });     test("falls back to USERPROFILE\\AppData\\Local when both are unset", () => {      vi.stubEnv("USERPROFILE", "C:\\Users\\user");      // The helper uses node:path.join which normalizes separators to the      // runtime platform, so on a POSIX test runner we can't assert the      // exact separator — just that all three segments are present.      const result = xdgDataHome();      expect(result).toContain("C:");      expect(result).toContain("Users");      expect(result).toContain("user");      expect(result).toContain("AppData");      expect(result).toContain("Local");    });     test("defaults USERPROFILE to ~ when everything is unset", () => {      const result = xdgDataHome();      expect(result.startsWith("~")).toBe(true);      expect(result).toContain("AppData");      expect(result).toContain("Local");    });  });});