public/sh/tests/hello-devops_test.sh

#!/usr/bin/env bash

# Unofficial Bash Strict Mode
set -euo pipefail
IFS='
'

FILENAME="student/hello-devops.sh"

# True if FILE exists and is a regular file
if [ -f ${FILENAME} ]; then
    # FILE exists and it's not empty
    if [ -s ${FILENAME} ]; then
        submitted=$(bash $FILENAME)
        expected=$(bash solutions/hello-devops.sh)
        diff <(echo "$submitted") <(echo "$expected") | cat -t
    else
        echo "The file exist but is empty"
        exit 1
    fi
else
    echo "File does not exist"
    exit 1
fi