code: def test_unary_ops():
      assert +NA is NA
      assert -NA is NA
      assert abs(NA) is NA
      assert ~NA is NA
  
imports: from datetime import date, time, timedelta
  import pickle
  import numpy
  import pytest
  from pandas._libs.missing import NA
  from pandas.core.dtypes.common import is_scalar
  import pandas
  import pandas._testing
label_desc: Use image node_id 11 for calling a global function with example usage: test_unary_ops() without return types