1.1 --- a/task4/solution02/test/org/apidesign/apifest08/test/Task2Test.java Fri Oct 17 17:40:14 2008 +0200
1.2 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000
1.3 @@ -1,119 +0,0 @@
1.4 -package org.apidesign.apifest08.test;
1.5 -
1.6 -import static org.apidesign.apifest08.currency.ConvertorFactory.createConvertor;
1.7 -import static org.apidesign.apifest08.currency.ConvertorFactory.mergeConvertors;
1.8 -import static org.apidesign.apifest08.currency.MoneyImpl.money;
1.9 -import static org.apidesign.apifest08.test.Task1Test.CZK;
1.10 -import static org.apidesign.apifest08.test.Task1Test.SKK;
1.11 -import static org.apidesign.apifest08.test.Task1Test.USD;
1.12 -import junit.framework.TestCase;
1.13 -
1.14 -import org.apidesign.apifest08.currency.Convertor;
1.15 -import org.apidesign.apifest08.currency.ExtendedConvertor;
1.16 -
1.17 -/** There are many currencies around the world and many banks manipulate
1.18 - * with more than one or two at the same time. As banks are usually the
1.19 - * best paying clients, which is true even in case of your Convertor API,
1.20 - * it is reasonable to listen to their requests.
1.21 - * <p>
1.22 - * The quest for today is to enhance your existing convertor API to hold
1.23 - * information about many currencies and allow conversions between any of them.
1.24 - * Also, as conversion rates for diferent currencies usually arise from various
1.25 - * bank departments, there is another important need. There is a need to
1.26 - * compose two convertors into one by merging all the information about
1.27 - * currencies they know about.
1.28 - */
1.29 -public class Task2Test extends TestCase {
1.30 - public Task2Test(String testName) {
1.31 - super(testName);
1.32 - }
1.33 -
1.34 - @Override
1.35 - protected void setUp() throws Exception {
1.36 - }
1.37 -
1.38 - @Override
1.39 - protected void tearDown() throws Exception {
1.40 - }
1.41 -
1.42 - // As in Task1Test, keep in mind, that there are three parts
1.43 - // of the whole system:
1.44 - // 1. there is someone who knows the current exchange rate
1.45 - // 2. there is someone who wants to do the conversion
1.46 - // 3. there is the API between 1. and 2. which allows them to communicate
1.47 - //
1.48 - // Please backward compatibly enhance your existing API to support following
1.49 - // usecases:
1.50 - //
1.51 -
1.52 - /** Create convertor that understands two currencies, CZK and
1.53 - * SKK. Make 100 SKK == 75 CZK. This is method for the group of users that
1.54 - * knows the exchange rate, and needs to use the API to create objects
1.55 - * with the exchange rate. Anyone shall be ready to call this method without
1.56 - * any other method being called previously. The API itself shall know
1.57 - * nothing about any rates, before this method is called.
1.58 - */
1.59 - public static Convertor createTripleConvertor() {
1.60 - // Rates: 1USD = 15CZK
1.61 - // Rates: 1USD = 20SKK
1.62 - // Rates: 75CZK = 100SKK
1.63 - return mergeConvertors(
1.64 - createConvertor(money(1, USD), money(15, CZK)),
1.65 - createConvertor(money(1, USD), money(20, SKK)),
1.66 - createConvertor(money(75, CZK), money(100, SKK))
1.67 - );
1.68 - }
1.69 -
1.70 - /** Define convertor that understands three currencies. Use it.
1.71 - */
1.72 - public void testConvertorForUSDandCZKandSKK() throws Exception {
1.73 - Convertor c = createTripleConvertor();
1.74 -
1.75 - // convert $5 to CZK using c:
1.76 - assertEquals("Result is 75 CZK", money(75, CZK),c.convert(money(5,USD), CZK));
1.77 -
1.78 - // convert $5 to SKK using c:
1.79 - assertEquals("Result is 100 SKK", money(100, SKK),c.convert(money(5,USD), SKK));
1.80 -
1.81 - // convert 200SKK to CZK using c:
1.82 - assertEquals("Result is 150 CZK", money(150, CZK),c.convert(money(200,SKK), CZK));
1.83 -
1.84 - // convert 200SKK to USK using c:
1.85 - assertEquals("Result is 10 USD", money(10, USD),c.convert(money(200,SKK), USD));
1.86 - }
1.87 -
1.88 - /** Merge all currency rates of convertor 1 with convertor 2.
1.89 - * Implement this using your API, preferably this method just delegates
1.90 - * into some API method which does the actual work, without requiring
1.91 - * API clients to code anything complex.
1.92 - */
1.93 - public static Convertor merge(Convertor one, Convertor two) {
1.94 - return mergeConvertors((ExtendedConvertor)one, (ExtendedConvertor)two);
1.95 - }
1.96 -
1.97 - /** Join the convertors from previous task, Task1Test and show that it
1.98 - * can be used to do reasonable conversions.
1.99 - */
1.100 - public void testConvertorComposition() throws Exception {
1.101 - Convertor c = merge(
1.102 - Task1Test.createCZKtoUSD(),
1.103 - Task1Test.createSKKtoCZK()
1.104 - );
1.105 -
1.106 - // convert $5 to CZK using c:
1.107 - assertEquals("Result is 85 CZK", money(85, CZK),c.convert(money(5,USD), CZK));
1.108 -
1.109 - // convert $8 to CZK using c:
1.110 - assertEquals("Result is 136 CZK", money(136, CZK),c.convert(money(8,USD), CZK));
1.111 -
1.112 - // convert 1003CZK to USD using c:
1.113 - assertEquals("Result is 59 USD", money(59, USD),c.convert(money(1003,CZK), USD));
1.114 -
1.115 - // convert 16CZK using c:
1.116 - assertEquals("Result is 20 SKK", money(20, SKK),c.convert(money(16,CZK), SKK));
1.117 -
1.118 - // convert 500SKK to CZK using c:
1.119 - assertEquals("Result is 400 CZK", money(400, CZK),c.convert(money(500,SKK), CZK));
1.120 -
1.121 - }
1.122 -}