code: def test_bspline(self, xp, scp, dtype):
      if xp.dtype(dtype).kind == "u":
          pytest.skip()
      k = 2
      t = xp.arange(7, dtype=dtype)
      c = xp.asarray(self.c, dtype=dtype)
      test_xs = xp.linspace(-5, 10, 100, dtype=dtype)
      B = scp.interpolate.BSpline(t, c, k, extrapolate=self.extrapolate)
      return B(test_xs)
  
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 3 for calling the TestBSpline obj's underlying member method code with example usage: obj.test_bspline(xp, scp, dtype) and returns: B