621         assert_eq!(checked_str, "��");  in test_cstr_to_str()
638         assert_eq!(unchecked_str, "��");  in test_cstr_as_str_unchecked()
644         assert_eq!(format!("{hello_world}"), "hello, world!");  in test_cstr_display()
646         assert_eq!(format!("{non_printables}"), "\\x01\\x09\\x0a");  in test_cstr_display()
648         assert_eq!(format!("{non_ascii}"), "d\\xe9j\\xe0 vu");  in test_cstr_display()
650         assert_eq!(format!("{good_bytes}"), "\\xf0\\x9f\\xa6\\x80");  in test_cstr_display()
661         assert_eq!(format!("{cstr}"), ALL_ASCII_CHARS);  in test_cstr_display_all_bytes()
667         assert_eq!(format!("{hello_world:?}"), "\"hello, world!\"");  in test_cstr_debug()
669         assert_eq!(format!("{non_printables:?}"), "\"\\x01\\x09\\x0a\"");  in test_cstr_debug()
671         assert_eq!(format!("{non_ascii:?}"), "\"d\\xe9j\\xe0 vu\"");  in test_cstr_debug()
673         assert_eq!(format!("{good_bytes:?}"), "\"\\xf0\\x9f\\xa6\\x80\"");  in test_cstr_debug()
679         assert_eq!(format!("{hello_world}"), "hello, world!");  in test_bstr_display()
681         assert_eq!(format!("{escapes}"), "_\\t_\\n_\\r_\\_'_\"_");  in test_bstr_display()
683         assert_eq!(format!("{others}"), "\\x01");  in test_bstr_display()
685         assert_eq!(format!("{non_ascii}"), "d\\xe9j\\xe0 vu");  in test_bstr_display()
687         assert_eq!(format!("{good_bytes}"), "\\xf0\\x9f\\xa6\\x80");  in test_bstr_display()
693         assert_eq!(format!("{hello_world:?}"), "\"hello, world!\"");  in test_bstr_debug()
695         assert_eq!(format!("{escapes:?}"), "\"_\\t_\\n_\\r_\\\\_'_\\\"_\"");  in test_bstr_debug()
697         assert_eq!(format!("{others:?}"), "\"\\x01\"");  in test_bstr_debug()
699         assert_eq!(format!("{non_ascii:?}"), "\"d\\xe9j\\xe0 vu\"");  in test_bstr_debug()
701         assert_eq!(format!("{good_bytes:?}"), "\"\\xf0\\x9f\\xa6\\x80\"");  in test_bstr_debug()