sorting.sh

#!/bin/bash
#

declare -a myarray=(a z d "e f")

readarray -t test_names < \
    <(printf '%s\0' "${myarray[@]}" "$@" | sort -z -u | xargs -0n1)

for test_name in "${test_names[@]}"
do
    echo $test_name
done

/tmp/sorting.sh a d c z        
a
c
d
e f
z