package apifest;

 import java.math.BigDecimal;

 import java.util.Currency;

 import junit.framework.TestCase;

 import org.apidesign.apifest08.currency.Convertor;

 import org.apidesign.apifest08.currency.ConvertorFactory;

 import org.apidesign.apifest08.currency.InvalidConversionException;

 /** Write a test that works with version from task A and fails with version B.

  */

 public class CurrencyTest extends TestCase {

     public CurrencyTest(String n) {

         super(n);

     }

     public void testCompatibility() throws Exception {

         incompatibility1();

       //  incompatibility2(); //another test proving incompatibility in versions

       //  incompatibility3(); //another test proving incompatibility in versions

     }

     private void incompatibility1() throws Exception {

           Convertor c = ConvertorFactory.getConvertor("CZK", BigDecimal.valueOf(17.0), "USD", BigDecimal.valueOf(1));

           assertTrue("", c.toString().startsWith("org.apidesign.apifest08.currency.ConvertorImpl"));

     }

     private void incompatibility2() throws Exception {

           Convertor c = ConvertorFactory.getConvertor("CZK", BigDecimal.valueOf(17.0), "USD", BigDecimal.valueOf(1));

           assertEquals("Testing hashcode", 961187025, c.hashCode());

     }

     private void incompatibility3() throws Exception {

         Convertor co = new Convertor() {

             public BigDecimal convert(Currency from, Currency to, BigDecimal amount) throws InvalidConversionException {

                 return null;

             }

         };

     }

 }