code: def test_singleton(self):
      ftype = finfo(single)
      ftype2 = finfo(single)
      assert_equal(id(ftype), id(ftype2))
  
imports: import warnings
  import numpy
  import pytest
  from numpy._core import finfo, iinfo
  from numpy import half, single, double, longdouble
  from numpy.testing import assert_equal, assert_, assert_raises
  from numpy._core.getlimits import _discovered_machar, _float_ma
label_desc: Use image node_id 1 for calling the TestSingle obj's underlying member method code with example usage: obj.test_singleton() without return types