Related Issue(s)

No linked issue. This is from the recurring test-gap detection pass.

Background

Recent work added download progress reporting for large rc cp downloads. The existing tests covered the known-size threshold behavior, but two branches remained unasserted: downloads with unknown total size and output configurations that disable progress rendering.

Root Cause

The helper intentionally avoids creating progress for unknown content length and relies on OutputConfig to suppress visible progress bars when --no-progress is active. Without focused tests, those branches could regress during future transfer UI changes.

Solution

Added two focused unit tests for update_download_progress:

• unknown total size keeps progress unset
• no_progress creates state for a large transfer but keeps the progress bar hidden

Test Status

• cargo test -p rustfs-cli commands::cp::tests::test_download_progress
• cargo fmt --all --check
• make pre-commit