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/* -*- c++ -*- */
/*
* Copyright 2019 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <gnuradio/fft/fft_shift.h>
#include <boost/test/unit_test.hpp>
#include <vector>
namespace gr {
namespace fft {
BOOST_AUTO_TEST_CASE(t1)
{
fft::fft_shift<int> s(1023);
std::vector<int> x_even{ 0, 1, 2, 3, -4, -3, -2, -1 };
std::vector<int> y_even{ -4, -3, -2, -1, 0, 1, 2, 3 }; // expected result
s.shift(x_even);
if (x_even.size() == y_even.size()) {
for (unsigned int i = 0; i < x_even.size(); i++) {
BOOST_CHECK(x_even[i] == y_even[i]);
}
} else {
BOOST_CHECK(x_even.size() == y_even.size());
}
// two shifts should not change the result
s.shift(x_even);
s.shift(x_even);
if (x_even.size() == y_even.size()) {
for (unsigned int i = 0; i < x_even.size(); i++) {
BOOST_CHECK(x_even[i] == y_even[i]);
}
} else {
BOOST_CHECK(x_even.size() == y_even.size());
}
}
BOOST_AUTO_TEST_CASE(t2)
{
fft::fft_shift<int> s(7);
std::vector<int> x_odd{ 0, 1, 2, 3, -3, -2, -1 };
std::vector<int> y_odd{ -3, -2, -1, 0, 1, 2, 3 }; // expected result
s.shift(x_odd);
if (x_odd.size() == y_odd.size()) {
for (unsigned int i = 0; i < x_odd.size(); i++) {
BOOST_CHECK(x_odd[i] == y_odd[i]);
}
} else {
BOOST_CHECK(x_odd.size() == y_odd.size());
}
}
} /* namespace fft */
} /* namespace gr */
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