// E2E text file utility tests cover bounded diagnostic file reads.

import { mkdirSync, writeFileSync } from "node:fs";

import path from "node:path";

import { afterEach, describe, expect, it } from "vitest";

import {

readTextFileBounded,

readTextFileTail,

tailText,

} from "../../scripts/e2e/lib/text-file-utils.mjs";

import { cleanupTempDirs, makeTempDir } from "../helpers/temp-dir.js";

const tempRoots: string[] = [];

function makeTempRoot() {

return makeTempDir(tempRoots, "openclaw-e2e-text-file-utils-");

}

afterEach(() => {

cleanupTempDirs(tempRoots);

});

describe("e2e text file utilities", () => {

it("keeps short diagnostic text intact and trims long text by byte count", () => {

expect(tailText("short", 8)).toBe("short");

expect(tailText("prefix-tail", 4)).toBe("tail");

});

it("reads only the requested file tail and treats missing or non-file paths as empty", () => {

const root = makeTempRoot();

const file = path.join(root, "output.log");

const directory = path.join(root, "nested");

mkdirSync(directory);

writeFileSync(file, "line-one\nline-two\nline-three", "utf8");

expect(readTextFileTail(file, 10)).toBe("line-three");

expect(readTextFileTail(path.join(root, "missing.log"), 10)).toBe("");

expect(readTextFileTail(directory, 10)).toBe("");

});

it("returns bounded file text and reports oversize diagnostics with a tail", () => {

const root = makeTempRoot();

const file = path.join(root, "artifact.json");

writeFileSync(file, `old prefix\n${"x".repeat(64)}\nfinal tail`, "utf8");

expect(readTextFileBounded(file, "artifact", 256)).toContain("final tail");

expect(() => readTextFileBounded(file, "artifact", 32, { tailBytes: 10 })).toThrowError(

/artifact exceeded 32 bytes: .* Tail: final tail/u,

);

});

});