japod@6: package org.apidesign.apifest08.test;
japod@6: 
japod@17: 
japod@6: import java.math.BigDecimal;
japod@6: import java.util.Currency;
japod@35: import java.util.Set;
japod@6: import junit.framework.TestCase;
japod@6: import org.apidesign.apifest08.currency.Convertor;
japod@6: import org.apidesign.apifest08.currency.ConvertorFactory;
japod@17: import org.apidesign.apifest08.currency.InvalidConversionException;
japod@17: 
japod@6: 
japod@6: /** Finish the Convertor API, and then write bodies of methods inside
japod@6:  * of this class to match the given tasks. To fullfil your task, use the
japod@6:  * API define in the <code>org.apidesign.apifest08.currency</code> package.
japod@6:  * Do not you reflection, or other hacks as your code
japod@6:  * shall run without any runtime permissions.
japod@6:  */
japod@6: public class Task1Test extends TestCase {
japod@17:     
japod@17:     private final static Currency CZK;
japod@17:     private final static Currency SKK;
japod@17:     private final static Currency USD;
japod@17: 
japod@17:     static
japod@17:     {
japod@17:         CZK = Currency.getInstance("CZK");
japod@17:         SKK = Currency.getInstance("SKK");
japod@17:         USD = Currency.getInstance("USD");
japod@17:     }
japod@17:     
japod@6:     public Task1Test(String testName) {
japod@6:         super(testName);
japod@6:     }
japod@6: 
japod@6:     @Override
japod@6:     protected void setUp() throws Exception {
japod@6:     }
japod@6: 
japod@6:     @Override
japod@6:     protected void tearDown() throws Exception {
japod@6:     }
japod@6: 
japod@6:     /** Create convertor that understands two currencies, CZK and
japod@6:      *  USD. Make 1 USD == 17 CZK.
japod@6:      *
japod@6:      * Creation of the convertor shall not require subclassing of any class
japod@6:      * or interface on the client side.
japod@6:      *
japod@6:      * @return prepared convertor ready for converting USD to CZK and CZK to USD
japod@6:      */
japod@6:     public static Convertor createCZKtoUSD()
japod@6:     {
japod@35:         return (ConvertorFactory.getConvertor("CZK", BigDecimal.valueOf(17.0),
japod@35:                                               "USD", BigDecimal.valueOf(1)));
japod@6:     }
japod@6: 
japod@6:     /** Create convertor that understands two currencies, CZK and
japod@6:      *  SKK. Make 100 SKK == 80 CZK.
japod@6:      *
japod@6:      * Creation of the convertor shall not require subclassing of any class
japod@6:      * or interface on the client side.
japod@6:      * 
japod@6:      * @return prepared convertor ready for converting SKK to CZK and CZK to SKK
japod@6:      */
japod@6:     public static Convertor createSKKtoCZK()
japod@6:     {
japod@35:         return (ConvertorFactory.getConvertor(Currency.getInstance("SKK"), BigDecimal.valueOf(100),
japod@35:                                               Currency.getInstance("CZK"), BigDecimal.valueOf(80)));
japod@6:     }
japod@6:     
japod@6:     /** Use the convertor from <code>createCZKtoUSD</code> method and do few conversions
japod@6:      * with it.
japod@6:      */
japod@6:     public void testCurrencyCZKUSD() throws Exception {
japod@6:         Convertor  c = createCZKtoUSD();
japod@6:         BigDecimal result;
japod@6:         
japod@6:         // convert $5 to CZK using c:
japod@6:         // assertEquals("Result is 85 CZK");
japod@17:         result = c.convert(USD, CZK, BigDecimal.valueOf(5));
japod@6:         assertEquals(new BigDecimal("85.00"), result);
japod@6: 
japod@6:         // convert $8 to CZK
japod@6:         // assertEquals("Result is 136 CZK");
japod@17:         result = c.convert(USD, CZK, BigDecimal.valueOf(8));
japod@6:         assertEquals(new BigDecimal("136.00"), result);
japod@6: 
japod@6:         // convert 1003CZK to USD
japod@6:         // assertEquals("Result is 59 USD");
japod@17:         result = c.convert(CZK, USD, BigDecimal.valueOf(1003));
japod@6:         assertEquals(new BigDecimal("59.00"), result);
japod@6:     }
japod@6: 
japod@6:     /** Use the convertor from <code>createSKKtoCZK</code> method and do few conversions
japod@6:      * with it.
japod@6:      */
japod@6:     public void testCurrencySKKCZK() throws Exception {
japod@6:         Convertor c = createSKKtoCZK();
japod@6:         BigDecimal result;
japod@6:         
japod@6:         // convert 16CZK using c:
japod@6:         // assertEquals("Result is 20 SKK");
japod@17:         result = c.convert(CZK, SKK, BigDecimal.valueOf(16));
japod@6:         assertEquals(new BigDecimal("20.00"), result);
japod@6:                         
japod@6:         // convert 500SKK to CZK
japod@6:         // assertEquals("Result is 400 CZK");
japod@17:         result = c.convert(SKK, CZK, BigDecimal.valueOf(500));
japod@6:         assertEquals(new BigDecimal("400.00"), result);
japod@6:    }
japod@6: 
japod@17:     /** 
japod@17:      * Verify that the CZK to USD convertor knows nothing about SKK.
japod@6:      */
japod@17:     public void testCannotConvertToSKKwithCZKUSDConvertor() 
japod@17:         throws Exception 
japod@17:     {
japod@17:         Convertor c = createCZKtoUSD();
japod@6:         
japod@17:         try
japod@17:         {
japod@17:             // convert $5 to SKK, the API shall say this is not possible
japod@17:             c.convert(USD, SKK, BigDecimal.valueOf(5));
japod@17:             fail("cannot use the CZKtoUSD converter to convert to SKK");
japod@17:         }
japod@17:         catch(InvalidConversionException ex)
japod@17:         {       
japod@17:             assertEquals("cannot convert to: SKK", ex.getMessage());
japod@17:             assertEquals(SKK, ex.getBadCurrency());
japod@17:             assertEquals(CZK, ex.getCurrencyA());
japod@17:             assertEquals(USD, ex.getCurrencyB());
japod@17:         }
japod@17: 
japod@17:         try
japod@17:         {
japod@17:             // convert 500 SKK to CZK, the API shall say this is not possible
japod@17:             c.convert(SKK, CZK, BigDecimal.valueOf(5));
japod@17:             fail("cannot use the CZKtoUSD converter to convert from SKK");
japod@17:         }
japod@17:         catch(InvalidConversionException ex)
japod@17:         {            
japod@17:             assertEquals("cannot convert from: SKK", ex.getMessage());
japod@17:             assertEquals(SKK, ex.getBadCurrency());
japod@17:             assertEquals(CZK, ex.getCurrencyA());
japod@17:             assertEquals(USD, ex.getCurrencyB());
japod@17:         }
japod@17:     }
japod@17:     
japod@17:     /** 
japod@17:      * Verify that the CZK to SKK convertor knows nothing about USD.
japod@17:      */
japod@17:     public void testCannotConvertToUSDwithSKKCZKConvertor() 
japod@17:         throws Exception 
japod@17:     {
japod@17:         Convertor c = createSKKtoCZK();
japod@17:         
japod@17:         try
japod@17:         {
japod@17:             // convert $5 to SKK, the API shall say this is not possible
japod@17:             c.convert(USD, SKK, BigDecimal.valueOf(5));
japod@17:             fail("cannot use the CZKtoUSD converter to convert to SKK");
japod@17:         }
japod@17:         catch(InvalidConversionException ex)
japod@17:         {       
japod@17:             assertEquals("cannot convert from: USD", ex.getMessage());
japod@17:             assertEquals(USD, ex.getBadCurrency());
japod@17:             assertEquals(SKK, ex.getCurrencyA());
japod@17:             assertEquals(CZK, ex.getCurrencyB());
japod@17:         }
japod@17: 
japod@17:         try
japod@17:         {
japod@17:             // convert 500 CZK to USD, the API shall say this is not possible
japod@17:             c.convert(CZK, USD, BigDecimal.valueOf(500));
japod@17:             fail("cannot use the CZKtoUSD converter to convert from SKK");
japod@17:         }
japod@17:         catch(InvalidConversionException ex)
japod@17:         {            
japod@17:             assertEquals("cannot convert to: USD", ex.getMessage());
japod@17:             assertEquals(USD, ex.getBadCurrency());
japod@17:             assertEquals(SKK, ex.getCurrencyA());
japod@17:             assertEquals(CZK, ex.getCurrencyB());
japod@17:         }
japod@17:     }
japod@35:     
japod@35:     public void testGetCurrencies()
japod@35:     {
japod@35:         Convertor           c;
japod@35:         Set<Currency> currencies;
japod@35:         
japod@35:         c          = createSKKtoCZK();
japod@35:         currencies = c.getCurrencies();        
japod@35:         assertEquals(2, currencies.size());
japod@35:         assertTrue(currencies.contains(Currency.getInstance("SKK")));
japod@35:         assertTrue(currencies.contains(Currency.getInstance("CZK")));
japod@35: 
japod@35:         c          = createCZKtoUSD();
japod@35:         currencies = c.getCurrencies();        
japod@35:         assertEquals(2, currencies.size());
japod@35:         assertTrue(currencies.contains(Currency.getInstance("USD")));
japod@35:         assertTrue(currencies.contains(Currency.getInstance("CZK")));
japod@35:     }
japod@35:     
japod@35:     public void testGetConverstionRate()
japod@35:         throws InvalidConversionException
japod@35:     {
japod@35:         Convertor c;
japod@35:        
japod@35:         c = createSKKtoCZK();
japod@35:         assertEquals(1.0,  c.getConversionRate(Currency.getInstance("CZK"), Currency.getInstance("CZK")).doubleValue());
japod@35:         assertEquals(1.0,  c.getConversionRate(Currency.getInstance("SKK"), Currency.getInstance("SKK")).doubleValue());
japod@35:         assertEquals(0.80, c.getConversionRate(Currency.getInstance("SKK"), Currency.getInstance("CZK")).doubleValue());
japod@35:         assertEquals(1.25, c.getConversionRate(Currency.getInstance("CZK"), Currency.getInstance("SKK")).doubleValue());
japod@35: 
japod@35:         c = createCZKtoUSD();
japod@35:         assertEquals(1.0,      c.getConversionRate(Currency.getInstance("CZK"), Currency.getInstance("CZK")).doubleValue());
japod@35:         assertEquals(1.0,      c.getConversionRate(Currency.getInstance("USD"), Currency.getInstance("USD")).doubleValue());
japod@35:         assertEquals(1.0/17.0, c.getConversionRate(Currency.getInstance("CZK"), Currency.getInstance("USD")).doubleValue(), 0.00000000000000001);
japod@35:         assertEquals(17.0,     c.getConversionRate(Currency.getInstance("USD"), Currency.getInstance("CZK")).doubleValue(), 0.00000000000000001);
japod@35:     }
japod@6: }
japod@6: