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TestVendingMachine.java

  1 /* Copyright (c) 2010 the authors listed at the following URL, and/or
  2 the authors of referenced articles or incorporated external code:
  3 http://en.literateprograms.org/Testing_Vending_Machine_(Java,_Junit)?action=history&offset=20070527171906
  4 
  5 Permission is hereby granted, free of charge, to any person obtaining
  6 a copy of this software and associated documentation files (the
  7 "Software"), to deal in the Software without restriction, including
  8 without limitation the rights to use, copy, modify, merge, publish,
  9 distribute, sublicense, and/or sell copies of the Software, and to
 10 permit persons to whom the Software is furnished to do so, subject to
 11 the following conditions:
 12 
 13 The above copyright notice and this permission notice shall be
 14 included in all copies or substantial portions of the Software.
 15 
 16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 17 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 18 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 19 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 20 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 21 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 22 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 23 
 24 Retrieved from: http://en.literateprograms.org/Testing_Vending_Machine_(Java,_Junit)?oldid=10378
 25 */
 26 
 27 import java.util.Random;

 28 
 29 
 30 /**
 31  * The test class TestVendingMachine.
 32  *
 33  * @author  LiteratePrograms.org
 34  * @version May 2007.
 35  */
 36 public class TestVendingMachine extends junit.framework.TestCase
 37 {
 38     private VendingMachine sodaVendor;
 39     private VendingMachine candyBarVendor;
 40 
 41     private static final int SODA_PRICE = 75;
 42     private static final int CANDY_BAR_PRICE = 60;
 43 
 44     private static int 
 45         ONE_P = 1, 
 46         TWO_P = 2, 
 47         FIVE_P = 5, 
 48         TEN_P = 10, 
 49         TWENTY_P = 20, 
 50         FIFTY_P = 50,
 51         ONE_POUND = 100, 
 52         TWO_POUNDS = 200; 
 53 
 54     private int[] coinage = {ONE_P, TWO_P, FIVE_P, TEN_P, TWENTY_P, FIFTY_P, ONE_POUND, TWO_POUNDS};
 55 
 56     Random generator = new Random();
 57 
 58 
 59     /**
 60      * Default constructor for test class TestVendingMachine
 61      */
 62     public TestVendingMachine()
 63     {
 64     }
 65 
 66     protected void setUp()
 67     {
 68         sodaVendor = new VendingMachine(SODA_PRICE);
 69         candyBarVendor = new VendingMachine(CANDY_BAR_PRICE);
 70     }
 71 
 72 
 73     protected void tearDown()
 74     {
 75         sodaVendor = null;
 76         candyBarVendor = null;
 77     }
 78 
 79 
 80     public void testConstructor()
 81     {
 82         // Existence test

 83         assertNotNull("Candy bar vendor exists", 
 84             candyBarVendor);
 85         assertNotNull("Soda vendor exists", 
 86             sodaVendor);
 87         // Type test

 88         assertTrue("Candy bar vandor is a vending machine", 
 89             candyBarVendor instanceof VendingMachine);
 90         assertTrue("Soda vandor is a vending machine", 
 91             sodaVendor instanceof VendingMachine);
 92     }
 93 
 94     public void testGetItemPrice()
 95     {
 96         assertEquals("Soda costs " + SODA_PRICE, 
 97             SODA_PRICE, 
 98             sodaVendor.getItemPrice());
 99         assertEquals("Candy bar costs " + CANDY_BAR_PRICE, 
100             CANDY_BAR_PRICE, 
101             candyBarVendor.getItemPrice());
102     }
103 
104     public void testBalanceIsInitiallyZero()
105     {
106         assertEquals("Balance of soda vending machine is initially zero", 
107             0,
108             sodaVendor.getCurrentBalance());
109     }
110 
111     public void testBalanceIsIncreasedByCoinValue()
112     {
113         int coin = 10;
114         sodaVendor.insertCoin(coin);
115         assertEquals("Balance of soda vending machine is equal to " + coin, 
116             coin,
117             sodaVendor.getCurrentBalance());
118     }
119 
120     public void testBalanceIsCumulative()
121     {
122         int coin = 10;
123         sodaVendor.insertCoin(coin);
124         sodaVendor.insertCoin(coin);
125         assertEquals("Balance of soda vending machine is equal to " + 2 * coin, 
126             2 * coin,
127             sodaVendor.getCurrentBalance());
128     }
129 
130     public void testBalanceReturnsToZeroOnVending()
131     {
132         sodaVendor.insertCoin(50);
133         sodaVendor.insertCoin(20);
134         sodaVendor.insertCoin(5);
135         // The price is right!

136         assertEquals("We have entered correct money", 
137             SODA_PRICE,
138             sodaVendor.getCurrentBalance());
139         sodaVendor.dispenseItem();
140         assertEquals("After vending, the balance of soda vending machine is zero", 
141             0,
142             sodaVendor.getCurrentBalance());
143     }
144 
145 
146     public void testInsertOneOfEachCoin() {
147        int valueOfCoins = insertCoins(candyBarVendor, coinage);
148        assertEquals("Coins to value of " + valueOfCoins + " has been inserted",
149            valueOfCoins,
150            candyBarVendor.getCurrentBalance());
151 
152     }
153 
154     private int[] correctMoneyForASoda = {FIVE_P, TWENTY_P, FIFTY_P};
155 
156     public void testCorrectMoneyInsertedForASoda() {
157         int costOfASoda = insertCoins(sodaVendor, correctMoneyForASoda);
158         assertEquals("Money inserted for a soda matches vending price",
159             SODA_PRICE,
160             costOfASoda);
161         assertEquals("Balance is also correct",
162             SODA_PRICE,
163             sodaVendor.getCurrentBalance());
164     } 
165 
166     private int[] correctMoneyForACandyBar = {ONE_P, TWO_P, TWO_P, FIVE_P, FIVE_P, FIVE_P, TEN_P, TEN_P, TWENTY_P};
167     public void testCorrectMoneyInsertedForACandyBar() {
168         int costOfACandyBar = insertCoins(candyBarVendor, correctMoneyForACandyBar);
169         assertEquals("Money inserted for a candy bar matches vending price",
170             CANDY_BAR_PRICE,
171             costOfACandyBar);
172         assertEquals("Balance is also correct",
173             CANDY_BAR_PRICE,
174             candyBarVendor.getCurrentBalance());
175     } 
176 
177     public void testBalanceForARandmonSequenceOfCoins()
178     {
179         // Create an array of up to 100 coins

180         int[] coins = new int[generator.nextInt(100)];
181         // Populate the array with coins 

182         for (int i = 0; i < coins.length; i++)
183         { // Generate a random coin from the currency collection

184           coins[i] = coinage[generator.nextInt(coinage.length)];
185         }
186         // now feed the candy machine and validate result

187         int totalInserted = insertCoins(candyBarVendor, coins);
188         assertEquals("Total entered is correct",
189             totalInserted,
190             candyBarVendor.getCurrentBalance());
191     }
192 
193 
194     public void testVending()
195     {
196         int valueOfCoins = insertCoins(sodaVendor, new int[]{50, 20, 5});
197         assertEquals("Coins equals item price", valueOfCoins, sodaVendor.getItemPrice());
198         sodaVendor.dispenseItem();
199         assertEquals("Balance should now be 0", 0, sodaVendor.getCurrentBalance());
200     }
201 
202     public void testNothingVendedIfInsufficientCoins()
203     {
204         candyBarVendor.insertCoin(CANDY_BAR_PRICE - 10);
205         candyBarVendor.dispenseItem();
206         assertEquals(CANDY_BAR_PRICE - 10, candyBarVendor.getCurrentBalance());
207         candyBarVendor.insertCoin(10);
208         assertEquals(CANDY_BAR_PRICE, candyBarVendor.getCurrentBalance());
209         candyBarVendor.dispenseItem();
210         assertEquals(0, candyBarVendor.getCurrentBalance());
211     }
212 
213     public void testVendingLeavesChange()
214     {
215         candyBarVendor.insertCoin(50);
216         candyBarVendor.insertCoin(50);
217         candyBarVendor.dispenseItem();
218         assertEquals(100 - CANDY_BAR_PRICE, candyBarVendor.getCurrentBalance());
219     }
220 
221     public void testRefundGivesChange()
222     {
223         candyBarVendor.insertCoin(50);
224         candyBarVendor.insertCoin(50);
225         candyBarVendor.dispenseItem();
226         assertEquals(100 - CANDY_BAR_PRICE, candyBarVendor.refundCurrentBalance());
227         assertEquals(0, candyBarVendor.getCurrentBalance());
228     }
229     	
230     public void testRefundEmptiesCurrentBalance()
231     {
232         candyBarVendor.insertCoin(50);
233         candyBarVendor.insertCoin(50);
234         candyBarVendor.dispenseItem();
235         candyBarVendor.refundCurrentBalance();
236         assertEquals(0, candyBarVendor.getCurrentBalance());
237     }
238 
239     public void testZeroCoinRejected()
240     {
241         sodaVendor.insertCoin(50);
242         sodaVendor.insertCoin(0);
243         assertEquals(50, sodaVendor.getCurrentBalance());
244     }
245 
246     public void testNegativeCoinRejected()
247     {
248         sodaVendor.insertCoin(50);
249         sodaVendor.insertCoin(-1);
250         assertEquals(50, sodaVendor.getCurrentBalance());
251     }
252 
253 
254 
255     	private int insertCoins(VendingMachine vm, int[] coins)
256     	{
257     	    int coinsInserted = 0;
258     		for (int coin: coins) 
259     		{
260     		    vm.insertCoin(coin);
261     		    coinsInserted += coin;
262     		}
263     		return coinsInserted;
264             }
265 
266 
267 }
268


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