old_contents: from csympy import Symbol, Integer
  
  def test_arit1():
      x = Symbol("x")
      y = Symbol("y")
      e = x + y
      e = x * y
      e = Integer(2)*x
      e = 2*x
  
  def test_arit2():
      x = Symbol("x")
      y = Symbol("y")
      assert x+x == Integer(2) * x
      assert x+x != Integer(3) * x
      #assert x+x == 2 * x
  
new_contents: from csympy import Symbol, Integer
  
  def test_arit1():
      x = Symbol("x")
      y = Symbol("y")
      e = x + y
      e = x * y
      e = Integer(2)*x
      e = 2*x
  
  def test_arit2():
      x = Symbol("x")
      y = Symbol("y")
      assert x+x == Integer(2) * x
      assert x+x != Integer(3) * x
      assert x+x == 2 * x
  
subject: Enable a test