new_contents: from app.logic import resultsets
  from sympy import sympify, Derivative, Integral, I, sqrt
  
  def test_predicates():
      assert resultsets.is_approximatable_constant(sqrt(2))
      assert not resultsets.is_approximatable_constant(sympify('2'))
      assert resultsets.is_complex(2*I + 3)
      assert not resultsets.is_complex(3)
  
subject: Add basic test for resultsets