SnapOtter/tests/unit/api/errors-friendly.test.ts

import { describe, expect, it } from "vitest";
import { friendlyError } from "../../../apps/api/src/lib/errors.js";

const GENERIC = "Processing failed. The file may be in an unsupported or corrupted format.";

describe("friendlyError", () => {
  it("collapses raw ffmpeg stderr dumps to a safe sentence", () => {
    const dump =
      "ffmpeg exited 234: Input #0, gif ... Pixel format 'gbrap' is not widely supported. Conversion failed!";
    expect(friendlyError(dump)).toBe(GENERIC);
  });

  it("collapses raw ffprobe stderr dumps", () => {
    expect(friendlyError("ffprobe exited 1: moov atom not found")).toBe(GENERIC);
  });

  it("collapses python tracebacks", () => {
    expect(friendlyError("Traceback (most recent call last):\n  File x\nValueError: boom")).toBe(
      GENERIC,
    );
  });

  it("collapses very long (>280 char) messages", () => {
    expect(friendlyError("x".repeat(400))).toBe(GENERIC);
  });

  it("collapses multi-line dumps (>3 lines)", () => {
    expect(friendlyError("l1\nl2\nl3\nl4\nl5")).toBe(GENERIC);
  });

  it("preserves intentional, user-facing validation messages", () => {
    for (const msg of [
      "This video has no audio track to normalize",
      "Reverse is limited to clips up to 5 minutes",
      "Crop rectangle 9999x9999+0+0 exceeds video size 640x360",
      "No subtitle track found in this video",
    ]) {
      expect(friendlyError(msg)).toBe(msg);
    }
  });

  it("does NOT collapse clean messages that merely contain tool-ish words (false-positive guard)", () => {
    // The old regex matched "conversion failed" / "pixel format" and would have
    // wrongly collapsed these legitimate messages.
    expect(friendlyError("SVG conversion failed")).toBe("SVG conversion failed");
    expect(friendlyError("PDF conversion failed")).toBe("PDF conversion failed");
    expect(friendlyError("Unsupported pixel format in source")).toBe(
      "Unsupported pixel format in source",
    );
  });

  it("scrubs internal filesystem paths", () => {
    expect(friendlyError("decode failed at /data/ai/models/whisper")).toBe(
      "decode failed at [internal]",
    );
    expect(friendlyError("wrote /tmp/workspace/out.mp4")).toBe("wrote [internal]");
  });

  it("is idempotent (safe to apply at every error surface)", () => {
    const dump = "ffmpeg exited 1: boom";
    expect(friendlyError(friendlyError(dump))).toBe(friendlyError(dump));
    const ok = "Region exceeds image bounds";
    expect(friendlyError(friendlyError(ok))).toBe(ok);
  });
});