use strict;
use warnings;

use Test::More tests => 7;
use Math::FFT;

{
    my $set = [1, 2, 3, 4, 250];
    my $d = Math::FFT->new($set);
    my $mean = $d->mean;
    # TEST
    check_value(52, $mean);
    my $std = $d->stdev;
    # TEST
    check_value(13*sqrt(290)/2, $std);
    my $rms = $d->rms;
    # TEST
    check_value(sqrt(12506), $rms);
    my ($min, $max) = $d->range;
    # TEST
    check_value(1, $min);
    # TEST
    check_value(250, $max);
    my $med = $d->median;
    # TEST
    check_value(3, $med);
}

{
    my $set = [1, 2, 3, 4];
    my $d = Math::FFT->new($set);
    my $med = $d->median;
    # TEST
    check_value(2.5, $med);
}

sub check_value {
    local $Test::Builder::Level = $Test::Builder::Level + 1;
    my ($true, $calc) = @_;
    my $error = abs($true - $calc);
    ok (scalar($error < 1e-10), "Checking for Error (error of $error)\n");
}