#!/usr/bin/env python3
#
# Copyright 2020 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
"""
Unit tests for fft.window
"""

import numpy
from gnuradio import gr_unittest
from gnuradio import fft

class test_window(gr_unittest.TestCase):
    """
    Unit tests for fft.window
    """

    def setUp(self):
        pass

    def tearDown(self):
        pass

    def test_normwin(self):
        """
        Verify window normalization
        """
        win = fft.window.build(fft.win_type.WIN_BLACKMAN_hARRIS, 21, normalize=True)
        power = numpy.sum([x*x for x in win])/len(win)
        self.assertAlmostEqual(power, 1.0)

if __name__ == '__main__':
    gr_unittest.run(test_window)