The test file seems fun, but overall it's not that bad. Bash is a fairly simple to parse syntax-wise, so as long as you know your coreutils and you know what you're looking for, making simple changes is fairly easy.
Take a look at how the tests are invoked :
for t in $(grep ^le_test_ $FILE_NAME | cut -d '(' -f 1)
do
if [ -z "$CASE" ] ; then
__green "Progress: "
[ "$_ret" = "0" ] && __green "$_ret" || __red "$_ret"
__green "/$num/$total"
printf "\n"
num=$(_math $num + 1)
fi
...
Bash works perfectly with "Write programs that do one thing and do it well". Wouldn't be so surprised if this was a bunch of small test cases separated by file.
le_test_xxx # <- this is not a comment anyway
# le_test_xxx does something nice. # <- doesn't match ^le_test_