code: def test_single_element_lists():
      mf = metrics.MetricFrame(
          metrics=skm.balanced_accuracy_score,
          y_true=[1],
          y_pred=[1],
          sensitive_features=[0],
      )
      assert mf.overall == 1
  
file_path: fairlearn/test/unit/metrics/test_metricframe_smoke.py
imports: from test.unit.input_convertors import conversions_for_1d
  import numpy
  import pandas
  import pytest
  import sklearn.metrics
  import fairlearn.metrics
  from .data_for_test import g_1, g_2, g_3, g_4, s_w, y_p, y_t
label_desc: Use image node_id 10 for calling a global function with example usage: test_single_element_lists() without return types