import { describe, expect, it, vi } from "vitest"; import { extractPathFromShellOutput, readPathFromLoginShell } from "./shell"; describe("extractPathFromShellOutput", () => {  it("extracts the path between capture markers", () => {    expect(      extractPathFromShellOutput("__T3CODE_PATH_START__\n/opt/homebrew/bin:/usr/bin\n__T3CODE_PATH_END__\n"),    ).toBe("/opt/homebrew/bin:/usr/bin");  });   it("ignores shell startup noise around the capture markers", () => {    expect(      extractPathFromShellOutput(        "Welcome to fish\n__T3CODE_PATH_START__\n/opt/homebrew/bin:/usr/bin\n__T3CODE_PATH_END__\nBye\n",      ),    ).toBe("/opt/homebrew/bin:/usr/bin");  });   it("returns null when the markers are missing", () => {    expect(extractPathFromShellOutput("/opt/homebrew/bin /usr/bin")).toBeNull();  });}); describe("readPathFromLoginShell", () => {  it("uses a shell-agnostic printenv PATH probe", () => {    const execFile = vi.fn<      (        file: string,        args: ReadonlyArray<string>,        options: { encoding: "utf8"; timeout: number },      ) => string    >(() => "__T3CODE_PATH_START__\n/a:/b\n__T3CODE_PATH_END__\n");     expect(readPathFromLoginShell("/opt/homebrew/bin/fish", execFile)).toBe("/a:/b");    expect(execFile).toHaveBeenCalledTimes(1);     const firstCall = execFile.mock.calls[0] as      | [string, ReadonlyArray<string>, { encoding: "utf8"; timeout: number }]      | undefined;    expect(firstCall).toBeDefined();    if (!firstCall) {      throw new Error("Expected execFile to be called");    }     const [shell, args, options] = firstCall;    expect(shell).toBe("/opt/homebrew/bin/fish");    expect(args).toHaveLength(2);    expect(args?.[0]).toBe("-ilc");    expect(args?.[1]).toContain("printenv PATH");    expect(args?.[1]).toContain("__T3CODE_PATH_START__");    expect(args?.[1]).toContain("__T3CODE_PATH_END__");    expect(options).toEqual({ encoding: "utf8", timeout: 5000 });  });});