Week13 die

1 files changed, 106 insertions, 0 deletions

diff --git a/Week13 Die/test/com/camilstaps/die/DieTest.java b/Week13 Die/test/com/camilstaps/die/DieTest.java
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+++ b/Week13 Die/test/com/camilstaps/die/DieTest.java
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+/*
+ * The MIT License (MIT)
+ * 
+ * Copyright (c) 2015 Camil Staps <info@camilstaps.nl>
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.camilstaps.die;
+
+import org.junit.After;
+import org.junit.AfterClass;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+/**
+ *
+ * @author camilstaps
+ */
+public class DieTest {
+    
+    private static final int PLAYERS = 100;
+    private static final int THROWS = 100;
+    
+    private static final double ACCEPTABLE_LOWER_BOUND = 0.95;
+    private static final double ACCEPTABLE_UPPER_BOUND = 1.05;
+    
+    public DieTest() {
+    }
+    
+    @BeforeClass
+    public static void setUpClass() {
+    }
+    
+    @AfterClass
+    public static void tearDownClass() {
+    }
+    
+    @Before
+    public void setUp() {
+    }
+    
+    @After
+    public void tearDown() {
+    }
+
+    /**
+     * Test that the probabilities for every different possible outcome are more or less close to the expected probability
+     * Accuracy of this test depends on PLAYERS, THROWS, ACCEPTABLE_LOWER_BOUND and ACCEPTABLE_UPPER_BOUND
+     * 
+     * With non-thread safe solutions, this test most of the time fails. With thread-safe solutions, the test normally passes.
+     */
+    @Test
+    public void correctProbabilities() {
+        // Start players
+        Die die = new Die();
+        Player players[] = new Player[PLAYERS];
+        Thread threads[] = new Thread[PLAYERS];
+        for (int i = 0; i < PLAYERS; i++) {
+            players[i] = new Player("Player " + i, die, THROWS);
+            threads[i] = new Thread(players[i]);
+            threads[i].start();
+        }
+        
+        // Gather data
+        int pips_counts[] = new int[Die.MAX_PIPS];
+        for (int i = 0; i < PLAYERS; i++) {
+            try {
+                threads[i].join();
+                for (int p : players[i].getPipss()) {
+                    pips_counts[p - 1]++;
+                }
+            } catch (InterruptedException e) {
+                System.err.println(e);
+            }
+        }
+        
+        // Verification
+        int lower_bound = (int) (PLAYERS * THROWS / Die.MAX_PIPS * ACCEPTABLE_LOWER_BOUND);
+        int upper_bound = (int) (PLAYERS * THROWS / Die.MAX_PIPS * ACCEPTABLE_UPPER_BOUND);
+        System.out.println("Normal: " + PLAYERS * THROWS / Die.MAX_PIPS);
+        System.out.println("Lower bound: " + lower_bound + " (" + ACCEPTABLE_LOWER_BOUND + ")");
+        System.out.println("Upper bound: " + upper_bound + " (" + ACCEPTABLE_UPPER_BOUND + ")");
+        for (int i = 0; i < Die.MAX_PIPS; i++) {
+            System.out.println("Number of " + i + ": " + pips_counts[i]);
+            assertTrue("Number of " + i + " out of range", pips_counts[i] > lower_bound && pips_counts[i] < upper_bound);
+        }
+    }
+}