for: single_line_test_files we have:  ( characters and  bytes)
for: empty.txt we have:  (0 characters and 0 bytes)
for: hello_world.txt we have: Hello World (11 characters and 11 bytes)
for: hello.txt we have: Hello (5 characters and 5 bytes)
for: unicode.txt we have: α - is Alpha (13 characters and 13 bytes)
