public void CheckAssociativeValues()
{
OperatorNodeFactory factory = new OperatorNodeFactory();
Assert.AreEqual(OperatorNode.Associative.Left, factory.GetAssociative('/'));
Assert.AreEqual(OperatorNode.Associative.Left, factory.GetAssociative('*'));
Assert.AreEqual(OperatorNode.Associative.Left, factory.GetAssociative('+'));
Assert.AreEqual(OperatorNode.Associative.Left, factory.GetAssociative('-'));
}