code: def test_bsplines(x, df, degree):
      bspline = BSplines(x, df, degree)
      bspline.transform(x)
  
imports: import pytest
  import numpy
  from numpy.testing import assert_allclose, assert_equal
  from statsmodels.gam.smooth_basis import UnivariatePolynomialSmoother, PolynomialSmoother, BSplines
label_desc: Use image node_id 3 for calling a global function with example usage: test_bsplines(x, df, degree) without return types