code: def test_boxcox1p_underflow():
      x = np.array([1e-15, 1e-306])
      lmbda = np.array([1e-306, 1e-18])
      y = boxcox1p(x, lmbda)
      assert_allclose(y, np.log1p(x), rtol=1e-14)
  
file_path: scipy/scipy/special/tests/test_boxcox.py
imports: import numpy
  from numpy.testing import assert_equal, assert_almost_equal, assert_allclose
  from scipy.special import boxcox, boxcox1p, inv_boxcox, inv_boxcox1p
label_desc: Use image node_id 5 for calling a global function with example usage: test_boxcox1p_underflow() without return types