code: def test_merge_groups_invalid_length(self):
      tableset = TableSet(self.tables.values(), self.tables.keys())
  
      with self.assertRaises(ValueError):
          tableset.merge(
              groups=["red", "blue"], group_name="color_code"
          )
  
file_path: agate/tests/test_tableset/test_merge.py
imports: from collections import OrderedDict
  from agate import Table, TableSet
  from agate.data_types import Number, Text
  from agate.testcase import AgateTestCase
label_desc: Use image node_id 5 for calling the TestAggregate obj's underlying member method code with example usage: obj.test_merge_groups_invalid_length() without return types