import junit.framework.*;

//-------------------------------------------------------------------------
/**
 *  Test class for Calculator.
 *
 *  @author  Stephen Edwards
 *  @version 2013.06.24
 */
public class CalculatorReferenceTest
    extends TestCase
{
    //~ Instance/static variables .............................................

    private Calculator calc;


    //~ Setup .................................................................

    // ----------------------------------------------------------
    /**
     * Creates a new Calculator object with zero in the accumulator.
     */
    public void setUp()
    {
        calc = new Calculator();
    }


    //~ Public Methods ........................................................

    // ----------------------------------------------------------
    /**
     * Check that a new calculator starts off with a zero value.
     */
    public void testInitial()
    {
        assertEquals(calc.getValue(), 0);
    }


    // ----------------------------------------------------------
    /**
     * Check setValue/getValue.
     */
    public void testSetValue1()
    {
        calc.setValue(37);
        assertEquals(calc.getValue(), 37);
    }


    // ----------------------------------------------------------
    /**
     * Check setValue/getValue.
     */
    public void testSetValue2()
    {
        calc.setValue(37);
        assertEquals(calc.getValue(), 37);
        calc.setValue(-42);
        assertEquals(calc.getValue(), -42);
    }


    // ----------------------------------------------------------
    /**
     * Check that clear returns the accumulator to zero.
     */
    public void testClear()
    {
        calc.setValue(49);
        calc.clear();
        assertEquals(calc.getValue(), 0);
    }


    // ----------------------------------------------------------
    /**
     * Check that add works on zero and non-zero accumulators.
     */
    public void testAdd1()
    {
        calc.add(49);
        assertEquals(calc.getValue(), 49);
    }


    // ----------------------------------------------------------
    /**
     * Check that add works on zero and non-zero accumulators.
     */
    public void testAdd2()
    {
        calc.add(49);
        assertEquals(calc.getValue(), 49);
        calc.add(40);
        assertEquals(calc.getValue(), 89);
    }


    // ----------------------------------------------------------
    /**
     * Check that subtract works on zero and non-zero accumulators.
     */
    public void testSubtract1()
    {
        calc.subtract(49);
        assertEquals(calc.getValue(), -49);
    }


    // ----------------------------------------------------------
    /**
     * Check that subtract works on zero and non-zero accumulators.
     */
    public void testSubtract2()
    {
        calc.subtract(49);
        assertEquals(calc.getValue(), -49);
        calc.subtract(-40);
        assertEquals(calc.getValue(), -9);
    }


    // ----------------------------------------------------------
    /**
     * Check that multiplyBy works on non-zero accumulators.
     */
    public void testMultiplyBy1()
    {
        calc.setValue(1);
        calc.multiplyBy(5);
        assertEquals(calc.getValue(), 5);
    }


    // ----------------------------------------------------------
    /**
     * Check that multiplyBy works on non-zero accumulators.
     */
    public void testMultiplyBy2()
    {
        calc.setValue(1);
        calc.multiplyBy(5);
        assertEquals(calc.getValue(), 5);
        calc.multiplyBy(4);
        assertEquals(calc.getValue(), 20);
    }


    // ----------------------------------------------------------
    /**
     * Check that divideBy works on non-zero accumulators.
     */
    public void testDivideBy1()
    {
        calc.setValue(100);
        calc.divideBy(5);
        assertEquals(calc.getValue(), 20);
    }


    // ----------------------------------------------------------
    /**
     * Check that divideBy works on non-zero accumulators.
     */
    public void testDivideBy2()
    {
        calc.setValue(100);
        calc.divideBy(5);
        assertEquals(calc.getValue(), 20);
        calc.divideBy(16);
        assertEquals(calc.getValue(), 1);
    }
}