diff -r 251d0ed461fb -r 58ec6da75f6f task4/solution04/test/org/apidesign/apifest08/test/Task1Test.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/task4/solution04/test/org/apidesign/apifest08/test/Task1Test.java	Sat Oct 11 23:38:46 2008 +0200
@@ -0,0 +1,223 @@
+package org.apidesign.apifest08.test;
+
+
+import java.math.BigDecimal;
+import java.util.Currency;
+import java.util.Set;
+import junit.framework.TestCase;
+import org.apidesign.apifest08.currency.Convertor;
+import org.apidesign.apifest08.currency.ConvertorFactory;
+import org.apidesign.apifest08.currency.InvalidConversionException;
+
+
+/** Finish the Convertor API, and then write bodies of methods inside
+ * of this class to match the given tasks. To fullfil your task, use the
+ * API define in the <code>org.apidesign.apifest08.currency</code> package.
+ * Do not you reflection, or other hacks as your code
+ * shall run without any runtime permissions.
+ */
+public class Task1Test extends TestCase {
+    
+    private final static Currency CZK;
+    private final static Currency SKK;
+    private final static Currency USD;
+
+    static
+    {
+        CZK = Currency.getInstance("CZK");
+        SKK = Currency.getInstance("SKK");
+        USD = Currency.getInstance("USD");
+    }
+    
+    public Task1Test(String testName) {
+        super(testName);
+    }
+
+    @Override
+    protected void setUp() throws Exception {
+    }
+
+    @Override
+    protected void tearDown() throws Exception {
+    }
+
+    /** Create convertor that understands two currencies, CZK and
+     *  USD. Make 1 USD == 17 CZK.
+     *
+     * Creation of the convertor shall not require subclassing of any class
+     * or interface on the client side.
+     *
+     * @return prepared convertor ready for converting USD to CZK and CZK to USD
+     */
+    public static Convertor createCZKtoUSD()
+    {
+        return (ConvertorFactory.getConvertor("CZK", BigDecimal.valueOf(17.0),
+                                              "USD", BigDecimal.valueOf(1)));
+    }
+
+    /** Create convertor that understands two currencies, CZK and
+     *  SKK. Make 100 SKK == 80 CZK.
+     *
+     * Creation of the convertor shall not require subclassing of any class
+     * or interface on the client side.
+     * 
+     * @return prepared convertor ready for converting SKK to CZK and CZK to SKK
+     */
+    public static Convertor createSKKtoCZK()
+    {
+        return (ConvertorFactory.getConvertor(Currency.getInstance("SKK"), BigDecimal.valueOf(100),
+                                              Currency.getInstance("CZK"), BigDecimal.valueOf(80)));
+    }
+    
+    /** Use the convertor from <code>createCZKtoUSD</code> method and do few conversions
+     * with it.
+     */
+    public void testCurrencyCZKUSD() throws Exception {
+        Convertor  c = createCZKtoUSD();
+        BigDecimal result;
+        
+        // convert $5 to CZK using c:
+        // assertEquals("Result is 85 CZK");
+        result = c.convert(USD, CZK, BigDecimal.valueOf(5));
+        assertEquals(new BigDecimal("85.00"), result);
+
+        // convert $8 to CZK
+        // assertEquals("Result is 136 CZK");
+        result = c.convert(USD, CZK, BigDecimal.valueOf(8));
+        assertEquals(new BigDecimal("136.00"), result);
+
+        // convert 1003CZK to USD
+        // assertEquals("Result is 59 USD");
+        result = c.convert(CZK, USD, BigDecimal.valueOf(1003));
+        assertEquals(new BigDecimal("59.00"), result);
+    }
+
+    /** Use the convertor from <code>createSKKtoCZK</code> method and do few conversions
+     * with it.
+     */
+    public void testCurrencySKKCZK() throws Exception {
+        Convertor c = createSKKtoCZK();
+        BigDecimal result;
+        
+        // convert 16CZK using c:
+        // assertEquals("Result is 20 SKK");
+        result = c.convert(CZK, SKK, BigDecimal.valueOf(16));
+        assertEquals(new BigDecimal("20.00"), result);
+                        
+        // convert 500SKK to CZK
+        // assertEquals("Result is 400 CZK");
+        result = c.convert(SKK, CZK, BigDecimal.valueOf(500));
+        assertEquals(new BigDecimal("400.00"), result);
+   }
+
+    /** 
+     * Verify that the CZK to USD convertor knows nothing about SKK.
+     */
+    public void testCannotConvertToSKKwithCZKUSDConvertor() 
+        throws Exception 
+    {
+        Convertor c = createCZKtoUSD();
+        
+        try
+        {
+            // convert $5 to SKK, the API shall say this is not possible
+            c.convert(USD, SKK, BigDecimal.valueOf(5));
+            fail("cannot use the CZKtoUSD converter to convert to SKK");
+        }
+        catch(InvalidConversionException ex)
+        {       
+            assertEquals("cannot convert to: SKK", ex.getMessage());
+            assertEquals(SKK, ex.getBadCurrency());
+            assertEquals(CZK, ex.getCurrencyA());
+            assertEquals(USD, ex.getCurrencyB());
+        }
+
+        try
+        {
+            // convert 500 SKK to CZK, the API shall say this is not possible
+            c.convert(SKK, CZK, BigDecimal.valueOf(5));
+            fail("cannot use the CZKtoUSD converter to convert from SKK");
+        }
+        catch(InvalidConversionException ex)
+        {            
+            assertEquals("cannot convert from: SKK", ex.getMessage());
+            assertEquals(SKK, ex.getBadCurrency());
+            assertEquals(CZK, ex.getCurrencyA());
+            assertEquals(USD, ex.getCurrencyB());
+        }
+    }
+    
+    /** 
+     * Verify that the CZK to SKK convertor knows nothing about USD.
+     */
+    public void testCannotConvertToUSDwithSKKCZKConvertor() 
+        throws Exception 
+    {
+        Convertor c = createSKKtoCZK();
+        
+        try
+        {
+            // convert $5 to SKK, the API shall say this is not possible
+            c.convert(USD, SKK, BigDecimal.valueOf(5));
+            fail("cannot use the CZKtoUSD converter to convert to SKK");
+        }
+        catch(InvalidConversionException ex)
+        {       
+            assertEquals("cannot convert from: USD", ex.getMessage());
+            assertEquals(USD, ex.getBadCurrency());
+            assertEquals(SKK, ex.getCurrencyA());
+            assertEquals(CZK, ex.getCurrencyB());
+        }
+
+        try
+        {
+            // convert 500 CZK to USD, the API shall say this is not possible
+            c.convert(CZK, USD, BigDecimal.valueOf(500));
+            fail("cannot use the CZKtoUSD converter to convert from SKK");
+        }
+        catch(InvalidConversionException ex)
+        {            
+            assertEquals("cannot convert to: USD", ex.getMessage());
+            assertEquals(USD, ex.getBadCurrency());
+            assertEquals(SKK, ex.getCurrencyA());
+            assertEquals(CZK, ex.getCurrencyB());
+        }
+    }
+    
+    public void testGetCurrencies()
+    {
+        Convertor           c;
+        Set<Currency> currencies;
+        
+        c          = createSKKtoCZK();
+        currencies = c.getCurrencies();        
+        assertEquals(2, currencies.size());
+        assertTrue(currencies.contains(Currency.getInstance("SKK")));
+        assertTrue(currencies.contains(Currency.getInstance("CZK")));
+
+        c          = createCZKtoUSD();
+        currencies = c.getCurrencies();        
+        assertEquals(2, currencies.size());
+        assertTrue(currencies.contains(Currency.getInstance("USD")));
+        assertTrue(currencies.contains(Currency.getInstance("CZK")));
+    }
+    
+    public void testGetConverstionRate()
+        throws InvalidConversionException
+    {
+        Convertor c;
+       
+        c = createSKKtoCZK();
+        assertEquals(1.0,  c.getConversionRate(Currency.getInstance("CZK"), Currency.getInstance("CZK")).doubleValue());
+        assertEquals(1.0,  c.getConversionRate(Currency.getInstance("SKK"), Currency.getInstance("SKK")).doubleValue());
+        assertEquals(0.80, c.getConversionRate(Currency.getInstance("SKK"), Currency.getInstance("CZK")).doubleValue());
+        assertEquals(1.25, c.getConversionRate(Currency.getInstance("CZK"), Currency.getInstance("SKK")).doubleValue());
+
+        c = createCZKtoUSD();
+        assertEquals(1.0,      c.getConversionRate(Currency.getInstance("CZK"), Currency.getInstance("CZK")).doubleValue());
+        assertEquals(1.0,      c.getConversionRate(Currency.getInstance("USD"), Currency.getInstance("USD")).doubleValue());
+        assertEquals(1.0/17.0, c.getConversionRate(Currency.getInstance("CZK"), Currency.getInstance("USD")).doubleValue(), 0.00000000000000001);
+        assertEquals(17.0,     c.getConversionRate(Currency.getInstance("USD"), Currency.getInstance("CZK")).doubleValue(), 0.00000000000000001);
+    }
+}
+