code: def test_contains_nan():
      # GH#52840
      arr = pd.array(range(5)) / 0
  
      assert np.isnan(arr._data[0])
      assert not arr.isna()[0]
      assert np.nan in arr
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_contains_nan() without return types