code: def test_output(self):
      res_df = fpmax(self.df, min_support=0.001, use_colnames=True)
      expect = pd.DataFrame(
          [
              [0.25, frozenset(["a"])],
              [0.25, frozenset(["b"])],
              [0.25, frozenset(["c", "d"])],
              [0.25, frozenset(["e"])],
          ],
          columns=["support", "itemsets"],
      )
  
      compare_dataframes(res_df, expect)
  
imports: import unittest
  import numpy
  import pandas
  from test_fpbase import FPTestEdgeCases, FPTestErrors, FPTestEx1, FPTestEx2, FPTestEx3All, compare_dataframes
  from mlxtend.frequent_patterns import fpmax
label_desc: Use image node_id 2 for calling the TestEx2 obj's underlying member method code with example usage: obj.test_output() without return types