1..7
# ::camelize()
ok 1 - ::camelize() upper-case the first letter
ok 2 - ::camelize() upper-case each letter after a _ and remove _
# ::underscore()
ok 3 - ::underscore() lower-case the first letter
ok 4 - ::underscore() lower-case each upper-case letter and add a _ before
ok 5 - ::underscore() lower-case all other letters
# ::humanize()
ok 6 - ::humanize() upper-case the first letter
ok 7 - ::humanize() replaces _ by a space
# Looks like everything went fine.