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package org.apidesign.apifest08.test;
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import static org.apidesign.apifest08.test.Currencies.CZK;
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import static org.apidesign.apifest08.test.Currencies.SKK;
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import static org.apidesign.apifest08.test.Currencies.USD;
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import java.math.BigDecimal;
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import junit.framework.TestCase;
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import org.apidesign.apifest08.currency.Amount;
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import org.apidesign.apifest08.currency.ConversionException;
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import org.apidesign.apifest08.currency.Convertor;
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import org.apidesign.apifest08.currency.UnsupportedConversionException;
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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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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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return new Convertor(new BigDecimal(17), USD, CZK);
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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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return new Convertor(new BigDecimal("0.8"), SKK, CZK);
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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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// convert $5 to CZK using c:
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Amount result = c.convert(new BigDecimal(5), USD, CZK);
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assertEquals("Result is 85 CZK", 85, result.getValue().intValue());
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// convert $8 to CZK
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result = c.convert(new BigDecimal(8), USD, CZK);
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assertEquals("Result is 136 CZK", 136, result.getValue().intValue());
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// convert 1003CZK to USD
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result = c.convert(new BigDecimal(1003), CZK, USD);
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assertEquals("Result is 59 USD", 59, result.getValue().intValue());
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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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// convert 16CZK using c:
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Amount result = c.convert(new BigDecimal(16), CZK, SKK);
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assertEquals("Result is 20 SKK", 20, result.getValue().intValue());
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// convert 500SKK to CZK
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result = c.convert(new BigDecimal(500), SKK, CZK);
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assertEquals("Result is 400 CZK", 400, result.getValue().intValue());
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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() throws Exception {
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Convertor c = createCZKtoUSD();
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// convert $5 to SKK, the API shall say this is not possible
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try {
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c.convert(new BigDecimal(5), USD, SKK);
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fail("convert $5 to SKK, the API shall say this is not possible");
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} catch (ConversionException e) {
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//expected
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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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try {
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c.convert(new BigDecimal("500"), SKK, CZK);
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fail("convert 500 SKK to CZK, the API shall say this is not possible");
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} catch (ConversionException e) {
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//expected
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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 testCannotConvertToSKKwithCZKSKKConvertor() throws Exception {
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Convertor c = createSKKtoCZK();
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// convert $5 to SKK, the API shall say this is not possible
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try {
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c.convert(new BigDecimal(5), USD, SKK);
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fail("convert $5 to SKK, the API shall say this is not possible");
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} catch(ConversionException e) {
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//expected
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}
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try {
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c.convert(new BigDecimal(500), CZK, USD);
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fail("convert 500 CZK to USD, the API shall say this is not possible");
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} catch(ConversionException e) {
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//expected
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}
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}
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}
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