code: def test_designinfo_describe():
      lhs, rhs = dmatrices(
          "y ~ x + a",
          {"y": [1, 2, 3], "x": [4, 5, 6], "a": ["a1", "a2", "a3"]},
      )
      assert lhs.design_info.describe() == "y"
      assert rhs.design_info.describe() == "1 + a + x"
  
imports: import sys
  import __future__
  import six
  import numpy
  import pytest
  from patsy import PatsyError
  from patsy.design_info import DesignMatrix, DesignInfo
  from patsy.eval import EvalEnvironment
  from patsy.desc import ModelDesc, Term, INTERCEPT
  from patsy.categorical import C
  from patsy.contrasts import Helmert
  from patsy.user_util import balanced, LookupFactor
  from patsy.build import design_matrix_builders, build_design_matrices
  from patsy.highlevel import *
  from patsy.util import have_pandas, have_pandas_categorical, have_pandas_categorical_dtype, pandas_Categorical_from_codes
  from patsy.origin import Origin
label_desc: Use image node_id 19 for calling a global function with example usage: test_designinfo_describe() without return types