getopts example/testcase/discussion

getopts.sh

#!/bin/sh
set -ue

error() {
   echo "${*:-Something failed}"
   exit 1
}

check() {
   arguments="${*}"
   command="${arguments#*? }"
   set +e
   message="$(eval "${command}" 2>&1)"
   return_value="$?"
   set -e
   foo="${arguments%% ?*}"
   fail="${foo#?*=}"

   if [ "fail" = "${fail}" ]; then
      if [ "${return_value}" -eq "0" ]; then
         echo "Expected to fail, success(${return_value}): ${command}, message: ${message:-Empty Message}"
      fi
   elif [ "${return_value}" -gt "0" ]; then
         echo "Expected success, received fail(${return_value}): ${command}, message: ${message:-Empty Message}"
   fi
}

opts() {
   arg=
   optscmd="getopts :abc: arg"

   ${optscmd} || error "Nothing given"

   while ${optscmd}; do
      case "${arg}" in
         a) export AV="A"
            ;;
         b) export BV="B"
            ;;
         c) export CV="${OPTARG}"
           ;;
         ?) error "Unknown arg: ${OPTARG}"
      esac
   done

   [ -n "${CV}" ] || error "-c option missing"
}

check c=fail false # test my tests
check c=succ true # test my tests
check c=succ opts -a -b -c SOMETHING
check c=succ opts -b -c SOMETHING # a is optional
check c=fail opts # nothing, should "fail" (e.g. print help page)
check c=fail opts -b -c # missing <data> for -c
check c=fail opts -a -b # missing mandatory/required -c <data>
check c=fail opts -a -b -c SOMETHING -d # undefined arg -d