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Added class for lottery numbers and unit tests for it
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+223
-8
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4 files changed

+223
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lines changed

‎hexagonal/src/main/java/com/iluwatar/hexagonal/App.java‎

Lines changed: 3 additions & 2 deletions
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@@ -23,11 +23,12 @@
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package com.iluwatar.hexagonal;
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/**
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* Hello world!
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*
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* Example application demonstrating Hexagonal Architecture
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*
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*/
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public class App {
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public static void main(String[] args) {
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System.out.println("Hello World!");
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System.out.println("Running hexagonal example");
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}
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}

‎hexagonal/src/main/java/com/iluwatar/hexagonal/domain/LotteryNumbers.java‎

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/**
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* The MIT License
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* Copyright (c) 2014 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.hexagonal.domain;
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import java.util.Collections;
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import java.util.HashSet;
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import java.util.PrimitiveIterator;
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import java.util.Random;
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import java.util.Set;
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/**
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*
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* Value object representing lottery numbers. This lottery uses sets of 4 numbers. The numbers must be unique and
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* between 1 and 20.
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*
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*/
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public class LotteryNumbers {
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private final Set<Integer> numbers;
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public static final int MIN_NUMBER = 1;
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public static final int MAX_NUMBER = 20;
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public static final int NUM_NUMBERS = 4;
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/**
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* Constructor. Creates random lottery numbers.
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*/
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private LotteryNumbers() {
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numbers = new HashSet<>();
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generateRandomNumbers();
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}
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/**
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* Constructor. Uses given numbers.
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*/
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private LotteryNumbers(Set<Integer> givenNumbers) {
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numbers = new HashSet<>();
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numbers.addAll(givenNumbers);
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}
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/**
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* @return random LotteryNumbers
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*/
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public static LotteryNumbers createRandom() {
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return new LotteryNumbers();
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}
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/**
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* @return given LotteryNumbers
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*/
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public static LotteryNumbers create(Set<Integer> givenNumbers) {
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return new LotteryNumbers(givenNumbers);
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}
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/**
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* @return lottery numbers
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*/
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public Set<Integer> getNumbers() {
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return Collections.unmodifiableSet(numbers);
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}
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@Override
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public int hashCode() {
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final int prime = 31;
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int result = 1;
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result = prime * result + ((numbers == null) ? 0 : numbers.hashCode());
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return result;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj) {
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return true;
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}
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if (obj == null) {
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return false;
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}
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if (getClass() != obj.getClass()) {
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return false;
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}
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LotteryNumbers other = (LotteryNumbers) obj;
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if (numbers == null) {
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if (other.numbers != null) {
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return false;
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}
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} else if (!numbers.equals(other.numbers)) {
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return false;
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}
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return true;
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}
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/**
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* Generates 4 unique random numbers between 1-20 into numbers set.
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*/
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private void generateRandomNumbers() {
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numbers.clear();
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RandomNumberGenerator generator = new RandomNumberGenerator(MIN_NUMBER, MAX_NUMBER);
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while (numbers.size() < NUM_NUMBERS) {
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int num = generator.nextInt();
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if (!numbers.contains(num)) {
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numbers.add(num);
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}
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}
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}
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/**
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*
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* Helper class for generating random numbers.
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*
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*/
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private static class RandomNumberGenerator {
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private PrimitiveIterator.OfInt randomIterator;
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/**
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* Initialize a new random number generator that generates random numbers in the range [min, max]
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*
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* @param min the min value (inclusive)
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* @param max the max value (inclusive)
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*/
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public RandomNumberGenerator(int min, int max) {
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randomIterator = new Random().ints(min, max + 1).iterator();
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}
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/**
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* @return a random number in the range (min, max)
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*/
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public int nextInt() {
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return randomIterator.nextInt();
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}
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}
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}

‎hexagonal/src/test/java/com/iluwatar/hexagonal/AppTest.java‎

Lines changed: 2 additions & 6 deletions
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@@ -22,20 +22,16 @@
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*/
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package com.iluwatar.hexagonal;
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import static org.junit.Assert.assertTrue;
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import org.junit.Test;
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/**
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* Unit test for simple App.
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*/
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public class AppTest {
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34-
/**
35-
* Rigourous Test :-)
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*/
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@Test
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public void testApp() {
39-
assertTrue(true);
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String[] args = {};
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App.main(args);
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}
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}

‎hexagonal/src/test/java/com/iluwatar/hexagonal/domain/LotteryNumbersTest.java‎

Lines changed: 66 additions & 0 deletions
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/**
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* The MIT License
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* Copyright (c) 2014 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
6+
* of this software and associated documentation files (the "Software"), to deal
7+
* in the Software without restriction, including without limitation the rights
8+
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9+
* copies of the Software, and to permit persons to whom the Software is
10+
* furnished to do so, subject to the following conditions:
11+
*
12+
* The above copyright notice and this permission notice shall be included in
13+
* all copies or substantial portions of the Software.
14+
*
15+
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16+
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17+
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18+
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19+
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20+
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21+
* THE SOFTWARE.
22+
*/
23+
package com.iluwatar.hexagonal.domain;
24+
25+
import static org.junit.Assert.assertEquals;
26+
import static org.junit.Assert.assertTrue;
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28+
import java.util.Arrays;
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import java.util.HashSet;
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import org.junit.Test;
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/**
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*
35+
* Unit tests for {@link LotteryNumbers}
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*
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*/
38+
public class LotteryNumbersTest {
39+
40+
private static final int NUM_RANDOM_NUMBER_ROUNDS = 1000;
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@Test
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public void testGivenNumbers() {
44+
LotteryNumbers numbers = LotteryNumbers.create(
45+
new HashSet<>(Arrays.asList(1, 2, 3, 4)));
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assertEquals(numbers.getNumbers().size(), 4);
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assertTrue(numbers.getNumbers().contains(1));
48+
assertTrue(numbers.getNumbers().contains(2));
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assertTrue(numbers.getNumbers().contains(3));
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assertTrue(numbers.getNumbers().contains(4));
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}
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53+
@Test(expected = UnsupportedOperationException.class)
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public void testNumbersCantBeModified() {
55+
LotteryNumbers numbers = LotteryNumbers.create(
56+
new HashSet<>(Arrays.asList(1, 2, 3, 4)));
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numbers.getNumbers().add(5);
58+
}
59+
60+
@Test
61+
public void testRandomNumbers() {
62+
for (int i = 0; i < NUM_RANDOM_NUMBER_ROUNDS; i++) {
63+
LotteryNumbers numbers = LotteryNumbers.createRandom();
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}
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}
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}

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