code: def test_1m_1cf(self, mf_1m_1cf: MetricFrame, aggregation: str):
      result, nominal = self._get_comparators(mf_1m_1cf, aggregation)
      assert isinstance(result, list)
      assert len(result) == len(QUANTILES)
      assert mf_1m_1cf.ci_quantiles == QUANTILES
      for cf in np.unique(g_2):
          # Check median close to nominal
          assert result[1][cf] == pytest.approx(
              nominal[cf], abs=ABS_TOL
          )
  
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 4 for calling the TestGroupExtremes obj's underlying member method code with example usage: obj.test_1m_1cf(mf_1m_1cf, aggregation) without return types