code: def test_logarithmic_at_zero(self):
      w = waveforms.chirp(
          t=0, f0=1.0, f1=2.0, t1=1.0, method="logarithmic"
      )
      assert_almost_equal(w, 1.0)
  
imports: import numpy
  from numpy.testing import assert_almost_equal, assert_equal, assert_, assert_allclose, assert_array_equal
  from pytest import raises
  import scipy.signal._waveforms
label_desc: Use image node_id 8 for calling the TestChirp obj's underlying member method code with example usage: obj.test_logarithmic_at_zero() without return types