public/sh/tests/find-files-extension_test.sh

#!/usr/bin/env bash

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

FILENAME="student/find-files-extension.sh"
script_dirS=$(cd -P "$(dirname "$BASH_SOURCE")" &>/dev/null && pwd)

challenge() {
	submitted=$(cd "$1" && bash "$script_dirS"/$FILENAME)
	expected=$(cd "$1" && bash "$script_dirS"/solutions/find-files-extension.sh)

	diff <(echo "$submitted") <(echo "$expected")
}

# True if FILE exists and is a regular file
if [ -f ${FILENAME} ]; then
    # FILE exists and it's not empty
    if [ -s ${FILENAME} ]; then
        if [[ $(cat $FILENAME | grep echo | wc -l) -ne 0 ]]; then
            echo "echo is not allowed in this exercise!";
            exit 1
        fi
		challenge find-files-extension/folder1
		challenge find-files-extension/folder2
    else
        echo "The file exist but is empty"
        exit 1
    fi
else
    echo "File does not exist"
    exit 1
fi