Subject: [PATCH] tests: add basic smoke/integration test script

[Aayushmaan Chakraborty]

Hi Gao Xiang and linux-erofs team,

The repository currently lacks any automated smoke or integration tests.

This patch adds a simple, self-contained bash script (tests/smoke.sh) that
verifies the primary userspace workflow:

- mkfs.erofs image creation (uncompressed)
- fsck.erofs integrity check
- erofsfuse FUSE mount
- Basic content verification
- Clean unmount and full cleanup

Features:
- Checks for required binaries upfront
- Fails fast with clear error messages
- Uses trap for cleanup on exit or failure
- Tested locally on Debian-based Chromebook (Crostini)

Happy to extend it (compressed variant, error cases, CI hooks, etc.) or
adjust as needed.

Patch attached.

Thank you!

Best regards,
Aayushmaan Chakraborty
GitHub: Aayushmaan-24
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