// Console sanitizer tests cover control-char filtering and code-point-safe truncation.

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

import { sanitizeForConsole } from "./console-sanitize.js";

const hasLoneSurrogate = (value: string) =>

/[\uD800-\uDBFF](?![\uDC00-\uDFFF])|(?<![\uD800-\uDBFF])[\uDC00-\uDFFF]/.test(value);

describe("sanitizeForConsole", () => {

it("truncates on code-point boundaries without splitting a surrogate pair", () => {

const grin = String.fromCodePoint(0x1f600); // 😀 — two UTF-16 code units

const out = sanitizeForConsole(grin.repeat(6), 3);

expect(out).toBe(`${grin.repeat(3)}…`);

expect(out !== undefined && hasLoneSurrogate(out)).toBe(false);

});

it("filters control chars, flattens whitespace, and leaves short strings intact", () => {

expect(sanitizeForConsole(" hello\tworld ")).toBe("hello world");

expect(sanitizeForConsole(undefined)).toBeUndefined();

});

});

.replace(/[\r\n\t]+/g, " ")

.replace(/\s+/g, " ")

.trim();

return sanitized.length > maxChars ? `${sanitized.slice(0, maxChars)}…` : sanitized;

const codePoints = Array.from(sanitized);

if (codePoints.length <= maxChars) {

return sanitized;

}

// Cap on code-point boundaries so a maxChars cut never splits a surrogate pair (emoji/astral) and

// leaves a lone surrogate before the ellipsis.

return `${codePoints.slice(0, maxChars).join("")}…`;

}