POSIX shell scripting challenge

challenge.sh

#!/bin/sh

set -eu

FILES=$(find . -maxdepth 1 -type f | sort)

# -------------- #
#     FIX ME     #
# vvvvvvvvvvvvvv #

./test.sh $FILES

space .sh

test.sh

#!/bin/sh

set -e

EXPECTED_1='./challenge.sh'
EXPECTED_2='./space .sh'
EXPECTED_3='./test.sh'

if [ "$1" = "$EXPECTED_1" ] && [ "$2" = "$EXPECTED_2" ] && [ "$3" = "$EXPECTED_3" ]; then
    echo 'OK'
else
    echo 'FAIL'
    echo "Expected 3 arguments: $EXPECTED_1 $EXPECTED_2 $EXPECTED_3"
    echo "Received $# argument$([ $# -ne 1 ] && echo 's'): $*"
    exit 1
fi