text: import sys
  import os
  sys.path.append(os.path.dirname(os.getcwd()))
  
  from main_program import add, product
  
  def test_add():
  	assert add(5, 4)==9
  	assert add(-9, 0)==-9
  
  def test_product():
  	assert product(5, 4)==20
  	assert product(-9, 0)==0
  