paperclip/server/src/__tests__/heartbeat-run-log.test.ts

import { describe, expect, it } from "vitest";
import { compactRunLogChunk } from "../services/heartbeat.js";

describe("compactRunLogChunk", () => {
  it("redacts inline base64 image data from structured log chunks", () => {
    const base64 = "A".repeat(4096);
    const chunk = `{"type":"user","message":{"content":[{"type":"image","source":{"type":"base64","data":"${base64}"}}]}}\n`;

    const compacted = compactRunLogChunk(chunk);

    expect(compacted).not.toContain(base64);
    expect(compacted).toContain("[omitted base64 image data: 4096 chars]");
  });

  it("truncates oversized chunks after sanitizing them", () => {
    const chunk = `${"x".repeat(90_000)}tail`;

    const compacted = compactRunLogChunk(chunk, 16_384);

    expect(compacted.length).toBeLessThan(chunk.length);
    expect(compacted).toContain("[paperclip truncated run log chunk:");
    expect(compacted.endsWith("tail")).toBe(true);
  });
});