code: def test_creation_class(self):
      arr1 = np.array([1.0, 2.0, 3.0], dtype=SF)
      assert arr1.dtype == SF(1.0)
      arr2 = np.array([1.0, 2.0, 3.0], dtype=SF(1.0))
      assert_array_equal(arr1.view(np.float64), arr2.view(np.float64))
  
imports: import pytest
  import numpy
  from numpy.testing import assert_array_equal
  from numpy.core._multiarray_umath import _discover_array_parameters, _get_sfloat_dtype
label_desc: Use image node_id 21 for calling the TestSFloat obj's underlying member method code with example usage: obj.test_creation_class() without return types