public/sh/tests/file-checker_test.sh

#!/usr/bin/env bash

set -euo pipefail
IFS='
'
script_dirS=$(cd -P "$(dirname "$BASH_SOURCE")" &>/dev/null && pwd)

# check that test command was not used
if grep -q "test" "$script_dirS"/student/file-checker.sh
then
    echo "The 'test' command is not allowed in this exercise"
    exit 1
fi

challenge() {
    submitted=$(bash "$script_dirS"/student/file-checker.sh "$1")
    expected=$(bash "$script_dirS"/solutions/file-checker.sh "$1")

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

chmod -xw "$script_dirS/file-checker/readable-only"
challenge "$script_dirS/file-checker/readable-only"
chmod -x "$script_dirS/file-checker/readable-and-writable"
challenge "$script_dirS/file-checker/readable-and-writable"
chmod -w "$script_dirS/file-checker/readable-and-executable"
chmod +x "$script_dirS/file-checker/readable-and-executable"
challenge "$script_dirS/file-checker/readable-and-executable"
chmod +x "$script_dirS/file-checker/readable-writable-executable"
challenge "$script_dirS/file-checker/readable-writable-executable"