package esimene;

import static org.hamcrest.CoreMatchers.*;
import static org.junit.Assert.*;

import org.junit.Test;

public class RpnCalculatorTest {

    @Test
    public void newCalculatorHasZeroInAccumulator() {
    	RpnCalculator calc = new RpnCalculator();
    	
    	assertThat(calc.getAccumulator(), is(0));
    }

    @Test
    public void accumulatorCanBeSet() {
        RpnCalculator calc = new RpnCalculator();
        
        calc.setAccumulator(1);
        
        assertEquals(calc.getAccumulator(), 1);
    }

    @Test
    public void calculatorSupportsEnter() {
    	RpnCalculator calc = new RpnCalculator();
    	
    	calc.setAccumulator(1);
    	calc.enter();
    	calc.setAccumulator(2);
    	calc.plus();
    	
    	assertEquals(calc.getAccumulator(), 3);
    }

    @Test
    public void calculatorSupportsAddition() {
    	RpnCalculator calc = new RpnCalculator();
    	
    	calc.setAccumulator(1);
    	calc.enter();
    	calc.setAccumulator(2);
    	calc.plus();
    	calc.enter();
    	calc.setAccumulator(3);
    	calc.multiply();
    	
    	assertEquals(calc.getAccumulator(), 9);
    }
    /*
    
    @Test
    public void stackTest(){
    	RpnCalculator calc = new RpnCalculator();
    	calc.setAccumulator(1);
    	calc.enter();
    	calc.setAccumulator(2);
    	calc.plus();
    	calc.setAccumulator(3);
    	calc.enter();
    	calc.setAccumulator(4);
    	calc.plus();
        assertEquals(new Integer(7), calc.st.pop());    	    	
        assertEquals(new Integer(3), calc.st.pop());    	    	
        //assertEquals(new Integer(3), calc.st.pop());    	
        assertTrue(calc.st.size()==0);
    }
    */
    @Test
    public void calculatorSupportsAdditionAndMultiplication() {
    	RpnCalculator calc = new RpnCalculator();
    	
    	calc.setAccumulator(1);
    	calc.enter();
    	calc.setAccumulator(2);
    	calc.plus();
    	calc.enter();
    	calc.setAccumulator(3);
    	calc.enter();
    	calc.setAccumulator(4);
    	calc.plus();    	
    	calc.multiply();
    	
    	assertEquals(calc.getAccumulator(), 21);
    }
    
    @Test
    public void calculatorSupportsStringCalculation() {
    	RpnCalculator calc = new RpnCalculator();
    	
    	calc.calculate("1 2 + 3 *");
    	
    	assertEquals(calc.getAccumulator(), 9);
    }
}