code: def test_empty_result():
      expect = pd.DataFrame(
          columns=[
              "antecedents",
              "consequents",
              "antecedent support",
              "consequent support",
              "support",
              "confidence",
              "lift",
              "leverage",
              "conviction",
              "zhangs_metric",
          ]
      )
      res_df = association_rules(df_freq_items, min_threshold=2)
      assert res_df.equals(expect)
  
imports: import numpy
  import pandas
  import pytest
  from numpy.testing import assert_raises
  from mlxtend.frequent_patterns import apriori, association_rules
label_desc: Use image node_id 6 for calling a global function with example usage: test_empty_result() without return types