code: def test_expit():
      assert hl.eval(hl.expit(0.0)) == 0.5
      assert hl.eval(hl.expit(800)) == 1.0
      assert hl.eval(hl.expit(-920)) == 0.0
      assert hl.eval(hl.expit(0.75)) == scsp.expit(0.75)
  
imports: import hail
  import scipy.special
  import pytest
label_desc: Use image node_id 2 for calling a global function with example usage: test_expit() without return types