diff -r 09d690bb97f6 -r 58ec6da75f6f task4/solution11/test/org/apidesign/apifest08/test/Task1Test.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/task4/solution11/test/org/apidesign/apifest08/test/Task1Test.java	Sat Oct 11 23:38:46 2008 +0200
@@ -0,0 +1,157 @@
+package org.apidesign.apifest08.test;
+
+import junit.framework.TestCase;
+import org.apidesign.apifest08.currency.Convertor;
+import org.apidesign.apifest08.currency.CurrencyValue;
+
+/** 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 {
+    public Task1Test(String testName) {
+        super(testName);
+    }
+
+    @Override
+    protected void setUp() throws Exception {
+    }
+
+    @Override
+    protected void tearDown() throws Exception {
+    }
+
+    //
+    // Imagine that there are three parts of the whole system:
+    // 1. there is someone who knows the current exchange rate
+    // 2. there is someone who wants to do the conversion
+    // 3. there is the API between 1. and 2. which allows them to communicate
+    // Please design such API
+    //
+
+    /** Create convertor that understands two currencies, CZK and
+     *  USD. Make 1 USD == 17 CZK. This is a method provided for #1 group -
+     *  e.g. those that know the exchange rate. They somehow need to create
+     *  the objects from the API and tell them the exchange rate. The API itself
+     *  knows nothing about any rates, before the createCZKtoUSD method is called.
+     *
+     * 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<Double, String> createCZKtoUSD() {
+        return Convertor.getConvertorDoubleString(
+                CurrencyValue.getCurrencyValue(1d, "USD"),
+                CurrencyValue.getCurrencyValue(17d, "CZK")
+        );
+    }
+
+    /** Create convertor that understands two currencies, CZK and
+     *  SKK. Make 100 SKK == 80 CZK. Again this is method for the #1 group -
+     *  it knows the exchange rate, and needs to use the API to create objects
+     *  with the exchange rate. Anyone shall be ready to call this method without
+     *  any other method being called previously. The API itself shall know
+     *  nothing about any rates, before this method is called.
+     *
+     * 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<Double, String> createSKKtoCZK() {
+        return Convertor.getConvertorDoubleString(
+                CurrencyValue.getCurrencyValue(100d, "SKK"),
+                CurrencyValue.getCurrencyValue(80d, "CZK")
+        );
+    }
+
+    //
+    // now the methods for group #2 follow:
+    // this group knows nothing about exchange rates, but knows how to use
+    // the API to do conversions. It somehow (by calling one of the factory
+    // methods) gets objects from the API and uses them to do the conversions.
+    //
+    
+    /** Use the convertor from <code>createCZKtoUSD</code> method and do few conversions
+     * with it.
+     */
+    public void testCurrencyCZKUSD() throws Exception {
+        Convertor<Double, String> c = createCZKtoUSD();
+        
+        CurrencyValue<Double, String> result;
+        
+        // convert $5 to CZK using c:
+        // assertEquals("Result is 85 CZK");
+        result = c.convert("CZK", CurrencyValue.getCurrencyValue(5d, "USD"));
+        assertEquals(CurrencyValue.getCurrencyValue(85d, "CZK"), result);
+
+        // convert $8 to CZK
+        // assertEquals("Result is 136 CZK");
+        result = c.convert("CZK", CurrencyValue.getCurrencyValue(8d, "USD"));
+        assertEquals(CurrencyValue.getCurrencyValue(136d, "CZK"), result);
+
+        // convert 1003CZK to USD
+        // assertEquals("Result is 59 USD");
+        result = c.convert("USD", CurrencyValue.getCurrencyValue(1003d, "CZK"));
+        assertEquals(CurrencyValue.getCurrencyValue(59d, "USD"), result);
+    }
+
+    /** Use the convertor from <code>createSKKtoCZK</code> method and do few conversions
+     * with it.
+     */
+    public void testCurrencySKKCZK() throws Exception {
+        Convertor<Double, String> c = createSKKtoCZK();
+        
+        CurrencyValue<Double, String> result;
+        
+        // convert 16CZK using c:
+        // assertEquals("Result is 20 SKK");
+        result = c.convert("SKK", CurrencyValue.getCurrencyValue(16d, "CZK"));
+        assertEquals(CurrencyValue.getCurrencyValue(20d, "SKK"), result);
+
+        // convert 500SKK to CZK
+        // assertEquals("Result is 400 CZK");
+        result = c.convert("CZK", CurrencyValue.getCurrencyValue(500d, "SKK"));
+        assertEquals(CurrencyValue.getCurrencyValue(400d, "CZK"), result);
+    }
+
+    /** Verify that the CZK to USD convertor knows nothing about SKK.
+     */
+    public void testCannotConvertToSKKwithCZKUSDConvertor() throws Exception {
+        Convertor<Double, String> c = createCZKtoUSD();
+        try {
+            // convert $5 to SKK, the API shall say this is not possible
+            c.convert("SKK", CurrencyValue.getCurrencyValue(16d, "CZK"));
+            fail("Should not convert");
+        } catch (Exception e) {
+        }
+        try {
+            // convert 500 SKK to CZK, the API shall say this is not possible
+            c.convert("CZK", CurrencyValue.getCurrencyValue(500d, "SKK"));
+            fail("Should not convert");
+        } catch (Exception e) {
+        }
+        
+    }
+
+    /** Verify that the CZK to SKK convertor knows nothing about USD.
+     */
+    public void testCannotConvertToUSDwithSKKCZKConvertor() throws Exception {
+        Convertor<Double, String> c = createSKKtoCZK();
+        try {
+            // convert $5 to SKK, the API shall say this is not possible
+            c.convert("SKK", CurrencyValue.getCurrencyValue(5d, "USD"));
+            fail("Should not convert");
+        } catch (Exception e) {
+        }
+        try {
+            // convert 500 CZK to USD, the API shall say this is not possible
+            c.convert("USD", CurrencyValue.getCurrencyValue(500d, "CZK"));
+            fail("Should not convert");
+        } catch (Exception e) {
+        }
+    }
+}