code: def test_1m_0cf(self, mf_1m_0cf: MetricFrame):
      assert isinstance(mf_1m_0cf.by_group_ci, list)
      assert len(mf_1m_0cf.by_group_ci) == len(QUANTILES)
      assert mf_1m_0cf.ci_quantiles == QUANTILES
      for g in np.unique(g_1):
          # Check median close to nominal
          assert mf_1m_0cf.by_group_ci[1][g] == pytest.approx(
              mf_1m_0cf.by_group[g], 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 1 for calling the TestByGroupQuantiles obj's underlying member method code with example usage: obj.test_1m_0cf(mf_1m_0cf) without return types