code: def test_bspline_len_c(self, xp, scp, dtype):
      if xp.dtype(dtype).kind == "u":
          pytest.skip()
  
      # for n+k+1 knots, only first n coefs are used.
      n, k = 33, 3
      t = xp.sort(testing.shaped_random((n + k + 1,), xp))
      c = testing.shaped_random((n,), xp)
  
      # pad coefficients with random garbage
      c_pad = xp.r_[c, testing.shaped_random((k + 1,), xp)]
  
      BSpline = scp.interpolate.BSpline
      b, b_pad = BSpline(t, c, k), BSpline(t, c_pad, k)
  
      dt = t[-1] - t[0]
  
      # Locally, linspace produces relatively different values (1e-7) between
      # NumPy and CuPy during testing. Such difference result in a 1e-3
      # tolerance
      xx = xp.linspace(t[0] - dt, t[-1] + dt, 50, dtype=dtype)
      return b(xx), b_pad(xx)
  
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 7 for calling the TestBSpline obj's underlying member method code with example usage: obj.test_bspline_len_c(xp, scp, dtype) and returns: b,  b_pad