VERIFICATION TEST: SHA256 TOOL
================================

Test 1: /etc/hostname
Expected:  1c7ae0f30a68699c38441fd54bfbe20aed8e0c7c8793e25db41d2ff169b9639c
Tool Output: 1c7ae0f30a68699c38441fd54bfbe20aed8e0c7c8793e25db41d2ff169b9639c
Match: YES

Test 2: /etc/passwd
Expected:  24a9d154e8b4556887f514b99bcd92c4d15fefbf284ff7ad481dad412849bd24
Tool Output: 24a9d154e8b4556887f514b99bcd92c4d15fefbf284ff7ad481dad412849bd24
Match: YES

Test 3: Error handling for missing file
Expected: exit code 1, error message printed
Result: exit_code=1, "Error: /nonexistent not found" printed
Match: YES

CONCLUSION: Tool verified correct against system sha256sum utility.