@Test
	public void testPlus(){
		//ReversePolishNotationCalculator calculator = new ReversePolishNotationCalculator();
		calculator.pushOperand(3.0);
		calculator.pushOperand(2);
		System.out.println(calculator.operandsToString());
		
		calculator.pushPlusOperator();
		System.out.println(calculator.operatorsToString());

		calculator.evaluateStack();
		
		assertEquals(5.0, calculator.popOperand(), 0);
		
	}