public void AssignSimpleAddition()
        {
            var command = ParseCommand("assign a to 3 + 2");

            Assert.IsTrue(command is VariableAssignmentCommand);
            VariableAssignmentCommand assignment = (VariableAssignmentCommand)command;

            Assert.IsTrue(assignment.variable is OperandVariable);
            OperandVariable variable = (OperandVariable)assignment.variable;

            Assert.AreEqual(OperandType.ADD, variable.operand);
            Assert.AreEqual(5f, CastNumber(variable.GetValue()).GetValue());
        }
        public void DivisionBeforeAddition()
        {
            var command = ParseCommand("assign a to 4 / 2 + 3");

            Assert.IsTrue(command is VariableAssignmentCommand);
            VariableAssignmentCommand assignment = (VariableAssignmentCommand)command;

            Assert.IsTrue(assignment.variable is OperandVariable);
            OperandVariable addVariable = (OperandVariable)assignment.variable;

            Assert.AreEqual(5f, CastNumber(addVariable.GetValue()).GetNumericValue());
            Assert.AreEqual(OperandType.ADD, addVariable.operand);
            Assert.IsTrue(addVariable.a is OperandVariable);
            Assert.IsTrue(addVariable.b is StaticVariable);
            OperandVariable multiplyVariable = (OperandVariable)addVariable.a;

            Assert.AreEqual(OperandType.DIVIDE, multiplyVariable.operand);
        }