Simple I/O test manager written in shellscript

ut.sh

#!/bin/bash

set -eu

test_prefix="tests"

function name_cmd () {
    local grp=$1
    echo "./${test_prefix}/cmd_${grp}"
}
function name_test () {
    local grp=$1
    local no=$2
    echo "./${test_prefix}/testcase_${grp}_${no}"
}

function exec_test () {
    local grp=$1
    local no=$2
    local testdata="./$test_prefix/tmp_testdata"
    local expected="./$test_prefix/tmp_expected"
    echo -n >$testdata
    echo -n >$expected

    b=true
    while read line
    do
        if [ "$line" = "" ];then b=false; continue; fi
        $b && echo $line >>$testdata || echo $line >>$expected
    done < `name_test $grp $no`

    # check
    local cmd=$(cat `name_cmd $grp`)
    local result="$( cat $testdata | $cmd )"
    echo -en "TEST \033[04m$grp-$no\033[00m  $cmd .. "
    if [ "$result" = "`cat $expected`" ]
    then
        echo -e "\033[32m[PASS]\033[00m"
    else
        echo -e "\033[31m[FAILED]\033[00m"
        echo -e "\033[33m[TEST DATA]\033[00m"
        cat $testdata
        echo "[EXPECT]"
        cat $expected
        echo "[ACTUAL RESULT]"
        echo "$result"
    fi
}
if [ $# -eq 1 ]
then
    grp=$1
    echo Run Tests in $grp
    grp_prefix="testcase_${grp}_"
    for f in $(find "./$test_prefix" -name "${grp_prefix}*")
    do
        no=${f#./$test_prefix/$grp_prefix}
        exec_test $grp $no
    done
elif [ $# -eq 2 ]
then
    exec_test $1 $2

elif [ $# -ge 3 ] && [ $1 = "new" ]
then
    grp=$2
    no=$3
    shift 3
    cmd=$*
    if [ "$cmd" = "" ]
    then
        cmd="python ${grp}.py"
    fi

    if [ ! -d "./$test_prefix" ]
    then
        mkdir "./$test_prefix"
    fi
    echo "Register Test [$grp - $no]"
    f=`name_test $grp $no`
    echo "Please input test data"
    while read line
    do
        if [ "$line" = "" ]
        then
            break
        fi
        echo $line
    done > $f
    echo >> $f
    echo "Please input expected result"
    while read line
    do
        if [ "$line" = "" ]
        then
            break
        fi
        echo $line
    done >> $f
    echo "$cmd" > `name_cmd $grp`
    echo "Test [$grp - $no] has been registered."
else
    echo
    echo "Usage:"
    echo -e "\t$ ut A              # Run tests in group [A]"
    echo -e "\t$ ut A B            # Run a test [A-B]"
    echo -e "\t$ ut new A B [cmd]  # Register a test [A-B] for a command [cmd]"
    echo -e "\t$ ut new A B        # Register a test [A-B] for python A.py"
    echo
fi