*** test program for CMessage class
--- test makeFileMessage method:
size of buffer : 12
content of buffer: "filename:123"
size of buffer : 0
content of buffer: ""
--- test makeCategoryMessage method:
size of buffer : 0
content of buffer: ""
size of buffer : 10
content of buffer: "[warning] "
size of buffer : 12
content of buffer: "[error(64)] "
