@Test
    public void nestedLeftTest() {
        String input = "((x + 2.0) * y)";
        Lexer lexer = new Lexer(input);
        Parser_v2 Parser_v2 = new Parser_v2(lexer);
        Expression exp = Parser_v2.parse();
        
        Token varOne = new Token("x");
        Token num = new Token("2.0");
        Token varTwo = new Token("y");
        
        Variable expVarOne = new Variable(varOne);
        Number expNum = new Number(num);
        Variable expVarTwo = new Variable(varTwo);
        
        Multiplication expected = new Multiplication(new Addition(expVarOne, expNum), expVarTwo);

        
        assertEquals(exp.toString(), expected.toString());
    }