new_contents: from test_util import *
  from funkyyak import grad
  
  def test_int_case():
      check_equivalent((lambda x:x*x)(2.0),         4.0)
      check_equivalent((lambda x:x*x)(2) + 0.0,     4.0)
      check_equivalent(grad(lambda x:x*x)(2.0),     4.0)
      check_equivalent(grad(lambda x:x*x)(2) + 0.0, 4.0)
  
subject: Test that an int arg to grad is okay