code: def test_intercept():
      dz = F.make_recarray([2, 3, 4], "z")
      v = F.I.design(dz, return_float=False)
      assert v.dtype.names == ("intercept",)
  
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 23 for calling a global function with example usage: test_intercept() without return types