code: def test_bad_difference_method(
      self,
      mf_1mdict_0cf: MetricFrame,
  ):
      msg = "Unrecognised comparison method: Random String"
      with pytest.raises(ValueError) as execInfo:
          _ = mf_1mdict_0cf.difference_ci(method="Random String")
      assert execInfo.value.args[0] == msg
  
imports: import numpy
  import pytest
  import sklearn.metrics
  from fairlearn.metrics import MetricFrame, count
  from .data_for_test import g_1, g_2, y_p, y_t
label_desc: Use image node_id 11 for calling the TestErrors obj's underlying member method code with example usage: obj.test_bad_difference_method(mf_1mdict_0cf) without return types