code: def test_flatiter(self):
      arr = np.array([1.0, 2.0, 3.0], dtype=SF(1.0))
  
      for i, val in enumerate(arr.flat):
          assert arr[i] == val
  
imports: import sys
  from tempfile import NamedTemporaryFile
  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 24 for calling the TestSFloat obj's underlying member method code with example usage: obj.test_flatiter() without return types