Description:

The following functions in cve_bin_tool/fetch_json_db.py lack proper test coverage and need unit tests to ensure reliability:

Functions Needing Tests:

~~ report

1. get_failed_downloads(self)

   • Ensures missing JSON files are correctly identified and logged.

2. verify_signature(self)

   • Tests GPG key import failures, invalid/missing signatures, and successful verification.

3. cleanup_directory(self)

   • Ensures temporary files and directories are properly removed.

4. handle_download(self) (Partial)

   • Handling unsigned mirror data (not self.is_signed).
   • Signature verification failure (verify_signature).
   • Retrying failed downloads and handling max retry conditions.

Suggested Actions:

• Mock file system interactions (Path.exists, shutil.rmtree, unlink).
• Mock GPG signature verification (gnupg.GPG).
• Simulate failed/missing downloads and retry behavior.