I add ISO Upper-case and lower-case characters '15.2.10.4' test.

ISO 15.2.10.4 Upper-case and lower-case characters

The correspondence between upper-case and lower-case characters is given in Table A.

Table A.

| upper-case characters | lower-case characters |
|:------------:|:------------:|
| A | a |
| B | b |
| C | c |
| D | d |
| E | e |
| F | f |
| G| g |
| H | h |
| I | i |
| J | j |
| K | k |
| L | l |
| M| m |
| N | n |
| O | o |
| P | p |
| Q | q |
| R | r |
| S| s |
| T | t |
| U | u |
| V | v |
| W | w |
| X | x |
| Y | y |
| Z | z |