1 /* 2 * Copyright (C) 2011 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.cache; 18 19 import junit.framework.TestCase; 20 21 /** 22 * Unit test for {@link CacheStats}. 23 * 24 * @author Charles Fry 25 */ 26 public class CacheStatsTest extends TestCase { 27 28 public void testEmpty() { 29 CacheStats stats = new CacheStats(0, 0, 0, 0, 0, 0); 30 assertEquals(0, stats.requestCount()); 31 assertEquals(0, stats.hitCount()); 32 assertEquals(1.0, stats.hitRate()); 33 assertEquals(0, stats.missCount()); 34 assertEquals(0.0, stats.missRate()); 35 assertEquals(0, stats.loadSuccessCount()); 36 assertEquals(0, stats.loadExceptionCount()); 37 assertEquals(0.0, stats.loadExceptionRate()); 38 assertEquals(0, stats.loadCount()); 39 assertEquals(0, stats.totalLoadTime()); 40 assertEquals(0.0, stats.averageLoadPenalty()); 41 assertEquals(0, stats.evictionCount()); 42 } 43 44 public void testSingle() { 45 CacheStats stats = new CacheStats(11, 13, 17, 19, 23, 27); 46 assertEquals(24, stats.requestCount()); 47 assertEquals(11, stats.hitCount()); 48 assertEquals(11.0/24, stats.hitRate()); 49 assertEquals(13, stats.missCount()); 50 assertEquals(13.0/24, stats.missRate()); 51 assertEquals(17, stats.loadSuccessCount()); 52 assertEquals(19, stats.loadExceptionCount()); 53 assertEquals(19.0/36, stats.loadExceptionRate()); 54 assertEquals(17 + 19, stats.loadCount()); 55 assertEquals(23, stats.totalLoadTime()); 56 assertEquals(23.0/(17 + 19), stats.averageLoadPenalty()); 57 assertEquals(27, stats.evictionCount()); 58 } 59 60 public void testMinus() { 61 CacheStats one = new CacheStats(11, 13, 17, 19, 23, 27); 62 CacheStats two = new CacheStats(53, 47, 43, 41, 37, 31); 63 64 CacheStats diff = two.minus(one); 65 assertEquals(76, diff.requestCount()); 66 assertEquals(42, diff.hitCount()); 67 assertEquals(42.0/76, diff.hitRate()); 68 assertEquals(34, diff.missCount()); 69 assertEquals(34.0/76, diff.missRate()); 70 assertEquals(26, diff.loadSuccessCount()); 71 assertEquals(22, diff.loadExceptionCount()); 72 assertEquals(22.0/48, diff.loadExceptionRate()); 73 assertEquals(26 + 22, diff.loadCount()); 74 assertEquals(14, diff.totalLoadTime()); 75 assertEquals(14.0/(26 + 22), diff.averageLoadPenalty()); 76 assertEquals(4, diff.evictionCount()); 77 78 assertEquals(new CacheStats(0, 0, 0, 0, 0, 0), one.minus(two)); 79 } 80 81 public void testPlus() { 82 CacheStats one = new CacheStats(11, 13, 15, 13, 11, 9); 83 CacheStats two = new CacheStats(53, 47, 41, 39, 37, 35); 84 85 CacheStats sum = two.plus(one); 86 assertEquals(124, sum.requestCount()); 87 assertEquals(64, sum.hitCount()); 88 assertEquals(64.0/124, sum.hitRate()); 89 assertEquals(60, sum.missCount()); 90 assertEquals(60.0/124, sum.missRate()); 91 assertEquals(56, sum.loadSuccessCount()); 92 assertEquals(52, sum.loadExceptionCount()); 93 assertEquals(52.0/108, sum.loadExceptionRate()); 94 assertEquals(56 + 52, sum.loadCount()); 95 assertEquals(48, sum.totalLoadTime()); 96 assertEquals(48.0/(56 + 52), sum.averageLoadPenalty()); 97 assertEquals(44, sum.evictionCount()); 98 99 assertEquals(sum, one.plus(two)); 100 } 101 } 102
