code: def test_normal_cdf():
      s = pd.Series([0, 1, 2, 3, -1])
      out = s.normal_cdf()
      assert (out == norm.cdf(s)).all()
      assert (s.index == out.index).all()
  
imports: import pandas
  import pytest
  from scipy.stats import norm
label_desc: Use image node_id 1 for calling a global function with example usage: test_normal_cdf() without return types