code: def test_signbit(self, xp, dtype):
      a = testing.shaped_arange((2, 3), xp, dtype)
      return xp.signbit(a)
  
file_path: cupy/tests/cupy_tests/math_tests/test_floating.py
imports: import unittest
  import numpy
  import cupy
  from cupy import testing
label_desc: Use image node_id 1 for calling the TestFloating obj's underlying member method code with example usage: obj.test_signbit(xp, dtype) and returns: xp