diff --git a/test/forgejo-data-fetcher.test.ts b/test/forgejo-data-fetcher.test.ts
index dd658c3..2f7649f 100644
--- a/test/forgejo-data-fetcher.test.ts
+++ b/test/forgejo-data-fetcher.test.ts
@@ -1,4 +1,4 @@
-import { beforeEach, describe, expect, it, jest, spyOn } from "bun:test";
+import { describe, expect, it, jest } from "bun:test";
 import {
   fetchForgejoData,
   mapFileStatus,
@@ -8,12 +8,23 @@ import {
 } from "../src/forgejo/data/fetcher";
 import type { Octokits } from "../src/github/api/client";
 import type { GitHubReviewComment } from "../src/github/types";
-// Import the module namespace so spyOn can patch the export directly.
-// This avoids mock.module() which replaces the module in Bun's registry
-// globally for the entire process — poisoning other test files
-// (like image-downloader.test.ts) that import the same module.
-// spyOn is auto-restored after each test, so no cross-file pollution.
-import * as imageDownloaderModule from "../src/github/utils/image-downloader";
+
+// NOTE: We intentionally do NOT mock downloadCommentImages here.
+//
+// Previous attempts to mock it (mock.module and spyOn) both caused
+// cross-file test pollution in Bun's single-process runner:
+//   - mock.module() permanently replaces the module in Bun's registry,
+//     poisoning image-downloader.test.ts when it runs afterward.
+//   - spyOn() on ESM module namespace exports doesn't correctly restore
+//     live bindings across test files on Linux Bun.
+//
+// The real downloadCommentImages is safe to call here because:
+//   1. Test comment bodies contain no GitHub image URLs
+//      (github.com/user-attachments/assets/...), so the function
+//      finds zero images and returns an empty Map.
+//   2. The only side effect is mkdir("/tmp/github-images") which is
+//      harmless on CI runners.
+// This avoids all module-level mocking issues entirely.
 
 // Helper to build a mock Octokits with REST methods
 function createMockOctokits({
@@ -126,15 +137,6 @@ const mockIssueRestResponse = {
 };
 
 describe("fetchForgejoData", () => {
-  // Stub downloadCommentImages per-test — returns empty Map (no-op on Forgejo).
-  // spyOn patches the live module export and is auto-restored after each test,
-  // unlike mock.module which persists for the entire Bun process.
-  beforeEach(() => {
-    spyOn(imageDownloaderModule, "downloadCommentImages").mockResolvedValue(
-      new Map(),
-    );
-  });
-
   describe("PR data fetching", () => {
     it("should fetch PR details, files, commits, comments, and reviews in parallel then per-review comments", async () => {
       const mockOctokits = createMockOctokits({