code: def test_input_modyfication(self):
      freq1 = np.array([0.0, 0.5, 0.5, 1.0])
      freq2 = np.array(freq1)
      firwin2(80, freq1, [1.0, 1.0, 0.0, 0.0])
      assert_equal(freq1, freq2)
  
imports: import numpy
  from numpy.testing import assert_almost_equal, assert_array_almost_equal, assert_equal, assert_, assert_allclose, assert_warns
  from pytest import raises
  import pytest
  from scipy.fft import fft
  from scipy.special import sinc
  from scipy.signal import kaiser_beta, kaiser_atten, kaiserord, firwin, firwin2, freqz, remez, firls, minimum_phase
label_desc: Use image node_id 10 for calling the TestFirwin2 obj's underlying member method code with example usage: obj.test_input_modyfication() without return types