code: def test_convert_to_output_format_wrong_order(self):
      out = convert_to_output_format({"width": 1, "coeff": "a"})
      expected_out = 'coeff_"a"__width_1'
      self.assertEqual(out, expected_out)
  
      out = convert_to_output_format({"c": 1, "b": 2, "a": 3})
      expected_out = "a_3__b_2__c_1"
      self.assertEqual(out, expected_out)
  
imports: from unittest import TestCase
  from tsfresh.utilities.string_manipulation import convert_to_output_format
label_desc: Use image node_id 2 for calling the StringUtilities obj's underlying member method code with example usage: obj.test_convert_to_output_format_wrong_order() without return types