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