code: def test_pchip_interpolate(self):
      assert_array_almost_equal(
          pchip_interpolate([1, 2, 3], [4, 5, 6], [0.5], der=1), [1.0]
      )
  
      assert_array_almost_equal(
          pchip_interpolate([1, 2, 3], [4, 5, 6], [0.5], der=0), [3.5]
      )
  
      assert_array_almost_equal(
          pchip_interpolate([1, 2, 3], [4, 5, 6], [0.5], der=[0, 1]),
          [[3.5], [1]],
      )
  
imports: import warnings
  import io
  import numpy
  from numpy.testing import assert_almost_equal, assert_array_equal, assert_array_almost_equal, assert_allclose, assert_equal, assert_
  from pytest import raises
  from scipy.interpolate import KroghInterpolator, krogh_interpolate, BarycentricInterpolator, barycentric_interpolate, approximate_taylor_polynomial, CubicHermiteSpline, pchip, PchipInterpolator, pchip_interpolate, Akima1DInterpolator, CubicSpline, make_interp_spline
label_desc: Use image node_id 9 for calling the TestPCHIP obj's underlying member method code with example usage: obj.test_pchip_interpolate() without return types