code: def data():
      """Fixture returning boolean array, with valid and missing values."""
      return pd.array(
          [True, False] * 4
          + [np.nan]
          + [True, False] * 44
          + [np.nan]
          + [True, False],
          dtype="boolean",
      )
  
imports: import numpy
  import pytest
  import pandas
label_desc: Use image node_id 1 for calling a global function with example usage: data() and returns: pd