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dnl  Copyright (C) 2025  CismonX <admin@cismon.net>
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dnl  Copying and distribution of this file, with or without modification,
dnl  are permitted in any medium without royalty,
dnl  provided the copyright notice and this notice are preserved.
dnl  This file is offered as-is, without any warranty.
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AT_SETUP([util lib: prng])
AT_KEYWORDS([lib prng])

AT_CHECK([
    gen_prng() {
        check-bookmarkfs-util prng -s$1 -n$2
    }

    seed=$(rand_u64_hex)$(rand_u64_hex)$(rand_u64_hex)$(rand_u64_hex)
    count=32

    prng_1=$(gen_prng $seed $count)
    prng_2=$(gen_prng $seed $count)
    prng_3=$(gen_prng $seed $count)

    # Given the same seed, the results should be consistent.
    if test "$prng_1" != "$prng_2" -o "$prng_2" != "$prng_3"; then
        exit 99
    fi

    # Bad PRNG if we're getting duplicates too soon.
    uniq_count=$(echo "$prng_1" | sort | uniq | wc -l)
    if test $uniq_count -ne $count; then
        exit 99
    fi
], , [ignore])

AT_CLEANUP