code: def test_basis_element(self, xp, scp, dtype):
      if xp.dtype(dtype).kind == "u":
          pytest.skip()
      t = xp.arange(7, dtype=dtype)
      b = scp.interpolate.BSpline.basis_element(
          t, extrapolate=self.extrapolate
      )
      return b.tck
  
imports: import pytest
  import inspect
  from cupy import testing
  from cupy_backends.cuda.api import driver
  from cupy_backends.cuda.api import runtime
  import numpy
  import cupyx.scipy.interpolate
label_desc: Use image node_id 15 for calling the TestBSpline obj's underlying member method code with example usage: obj.test_basis_element(xp, scp, dtype) and returns: b