diff -r 978f6a78c22e -r c6b50876b5cf task4/solution12/test/org/apidesign/apifest08/test/Task3Test.java
--- a/task4/solution12/test/org/apidesign/apifest08/test/Task3Test.java	Fri Oct 17 17:54:38 2008 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,145 +0,0 @@
-package org.apidesign.apifest08.test;
-
-import java.util.Currency;
-
-import junit.framework.TestCase;
-import org.apidesign.apifest08.currency.Convertor;
-import org.apidesign.apifest08.currency.exceptions.UnknownConvertorException;
-
-/** The exchange rates are not always the same. They are changing. Day by day,
- * hour by hour, minute by minute. For every bank it is important to always
- * have the actual exchange rate available in the system. That is why let's
- * create a pluggable convertor that will always have up to date value of its
- * exchange rate.
- * <p>
- * The quest for today is to allow 3rd party developer to write a convertor
- * that adjusts its exchange rate everytime it is queried. This convertor is
- * written by independent vendor, the vendor knows only your Convertor API,
- * he does not know how the whole system looks and how the convertor is supposed
- * to be used.
- */
-public class Task3Test extends TestCase {
-  
-    private static double actualRate;
-    private static boolean increasing;
-    
-    private static final double EXCHANGE_RATE_MAX = 16.0;
-    private static final double EXCHANGE_RATE_MIN = 15.0;
-  
-    public Task3Test(String testName) {
-        super(testName);
-    }
-
-    @Override
-    protected void setUp() throws Exception {
-    }
-
-    @Override
-    protected void tearDown() throws Exception {
-    }
-
-    // Backward compatibly enhance your existing API to support following
-    // usecases:
-    //
-
-
-    /** Without knowing anything about the surrounding system, write an
-     * implementation of convertor that will return different rates everytime
-     * it is queried. Convert USD to CZK and vice versa. Start with the rate of
-     * 1USD = 16CZK and adjust it in favor of CZK by 0.01 CZK with every query.
-     * As soon as you reach 1USD = 15CZK adjust it by 0.01 CZK in favor of USD
-     * until you reach 1USD = 16CZK
-     *
-     * @return new instance of "online" USD and CZK convertor starting with rate 1USD = 16CZK
-     */
-    public static Convertor createOnlineCZKUSDConvertor() {
-      actualRate = 16.01;
-      increasing = false;
-      
-      // sets actual exchange rates
-      setRates();
-      
-      // create new instance
-      Convertor convertor = null;
-      try {
-        convertor = Convertor.getConvertorInstance(Currency.getInstance("USD"), Currency.getInstance("CZK"));
-      } catch (UnknownConvertorException e) {
-        e.printStackTrace();
-      }
-
-      return convertor;
-    }
-
-    public void testFewQueriesForOnlineConvertor() throws Exception {
-        Convertor c = createOnlineCZKUSDConvertor();
-        doFewQueriesForOnlineConvertor(c);
-    }
-
-    static void doFewQueriesForOnlineConvertor(Convertor c) throws Exception {
-        // convert $5 to CZK using c:
-        double result = c.convert(5d, Currency.getInstance("USD"), Currency.getInstance("CZK"));
-        double expectedResult = actualRate * 5;
-        assertEquals("Result is not " + expectedResult + " CZK", expectedResult, result);
-
-        // change exchange rates
-        setRates();
-        
-        // convert $8 to CZK using c:
-        result = c.convert(8d, Currency.getInstance("USD"), Currency.getInstance("CZK"));
-        expectedResult = actualRate * 8;
-        assertEquals("Result is not " + expectedResult + " CZK", expectedResult, result);
-        
-        // change exchange rates
-        setRates();
-
-        // convert $1 to CZK using c:
-        result = c.convert(1d, Currency.getInstance("USD"), Currency.getInstance("CZK"));
-        expectedResult = actualRate * 1;
-        assertEquals("Result is not " + expectedResult + " CZK", expectedResult, result);
-        
-        // change exchange rates
-        setRates();
-
-        // convert 15.97CZK to USD using c:
-        result = c.convert(15.97d, Currency.getInstance("CZK"), Currency.getInstance("USD"));
-        expectedResult = 15.97 / actualRate ;
-        assertEquals("Result is not " + expectedResult + " USD", expectedResult, result);
-    }
-
-    /** Join the convertors and show they behave sane.
-     */
-    public void testOnlineConvertorComposition() throws Exception {
-        Convertor c = Task2Test.merge(
-            createOnlineCZKUSDConvertor(),
-            Task1Test.createSKKtoCZK()
-        );
-
-        // convert 16CZK to SKK using c:
-        double result = c.convert(16d, Currency.getInstance("CZK"), Currency.getInstance("SKK"));
-        assertEquals("Result is not 20 SKK", 20d, result);
-
-        // convert 500SKK to CZK using c:
-        result = c.convert(500d, Currency.getInstance("SKK"), Currency.getInstance("CZK"));
-        assertEquals("Result is not 400 CZK", 400d, result);
-
-        doFewQueriesForOnlineConvertor(c);
-    }
-    
-    private static void setRates() {
-      // logic for change of actual exchange rate
-      if(increasing) {
-        actualRate += 0.01;
-        if(actualRate == EXCHANGE_RATE_MAX){
-          increasing = false;
-        }
-      } else {
-        actualRate -= 0.01;
-        if(actualRate == EXCHANGE_RATE_MIN){
-          increasing = true;
-        }
-      }
-      
-      // set exchange rates
-      Convertor.setConvertorRates(Currency.getInstance("USD"), Currency.getInstance("CZK"), actualRate, 1d);
-    }
-}