code: def test_factor_term():
      # Test that byte strings, unicode strings and objects convert correctly
      for nt in "S3", "U3", "O":
          ndt = np.dtype(nt)
          for lt in "S3", "U3", "O":
              ldt = np.dtype(lt)
              name = np.array("foo", ndt).item()
              level = np.array("bar", ldt).item()
              ft = F.FactorTerm(name, level)
              assert str(ft) == "foo_bar"
  
imports: from warnings import catch_warnings, simplefilter
  import numpy
  import pytest
  import sympy
  from numpy.core.records import fromrecords
  from numpy.testing import assert_almost_equal, assert_array_equal
  from sympy.utilities.lambdify import implemented_function
  from nipy.utils import VisibleDeprecationWarning
  from ..None import formulae
  from ..formulae import Term, terms
label_desc: Use image node_id 30 for calling a global function with example usage: test_factor_term() without return types