Parameters on bash

#!/usr/bin/env bash

TEST1="Default 1"
TEST2="Default 2"
TEST3=""

# ./test.sh --test1 "xxxxxx" --test2 "xxxxx" --test3

while test $# -gt 0
do
    case "${1}" in
        --test1 | -1) TEST1=${2}; shift;;
        --test2 | -2) TEST2=${2}; shift;;
        --test3 | -3) TEST3="Default3";;
                   *) echo "Wrong parameter: ${1}"; exit 1;;
    esac
    shift
done

echo ${TEST1}
echo ${TEST2}
echo ${TEST3}