1 /* 2 * Copyright (C) 2008 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.base; 18 19 import static java.util.concurrent.TimeUnit.MICROSECONDS; 20 import static java.util.concurrent.TimeUnit.MILLISECONDS; 21 import static java.util.concurrent.TimeUnit.NANOSECONDS; 22 23 import com.google.common.annotations.GwtCompatible; 24 import com.google.common.annotations.GwtIncompatible; 25 import com.google.common.testing.FakeTicker; 26 27 import junit.framework.TestCase; 28 29 /** 30 * Unit test for {@link Stopwatch}. 31 * 32 * @author Kevin Bourrillion 33 */ 34 @GwtCompatible(emulated = true) 35 public class StopwatchTest extends TestCase { 36 37 private final FakeTicker ticker = new FakeTicker(); 38 private final Stopwatch stopwatch = new Stopwatch(ticker); 39 40 public void testCreateStarted() { 41 Stopwatch startedStopwatch = Stopwatch.createStarted(); 42 assertTrue(startedStopwatch.isRunning()); 43 } 44 45 public void testCreateUnstarted() { 46 Stopwatch unstartedStopwatch = Stopwatch.createUnstarted(); 47 assertFalse(unstartedStopwatch.isRunning()); 48 assertEquals(0, unstartedStopwatch.elapsed(NANOSECONDS)); 49 } 50 51 public void testInitialState() { 52 assertFalse(stopwatch.isRunning()); 53 assertEquals(0, stopwatch.elapsed(NANOSECONDS)); 54 } 55 56 public void testStart() { 57 assertSame(stopwatch, stopwatch.start()); 58 assertTrue(stopwatch.isRunning()); 59 } 60 61 public void testStart_whileRunning() { 62 stopwatch.start(); 63 try { 64 stopwatch.start(); 65 fail(); 66 } catch (IllegalStateException expected) { 67 } 68 assertTrue(stopwatch.isRunning()); 69 } 70 71 public void testStop() { 72 stopwatch.start(); 73 assertSame(stopwatch, stopwatch.stop()); 74 assertFalse(stopwatch.isRunning()); 75 } 76 77 public void testStop_new() { 78 try { 79 stopwatch.stop(); 80 fail(); 81 } catch (IllegalStateException expected) { 82 } 83 assertFalse(stopwatch.isRunning()); 84 } 85 86 public void testStop_alreadyStopped() { 87 stopwatch.start(); 88 stopwatch.stop(); 89 try { 90 stopwatch.stop(); 91 fail(); 92 } catch (IllegalStateException expected) { 93 } 94 assertFalse(stopwatch.isRunning()); 95 } 96 97 public void testReset_new() { 98 ticker.advance(1); 99 stopwatch.reset(); 100 assertFalse(stopwatch.isRunning()); 101 ticker.advance(2); 102 assertEquals(0, stopwatch.elapsed(NANOSECONDS)); 103 stopwatch.start(); 104 ticker.advance(3); 105 assertEquals(3, stopwatch.elapsed(NANOSECONDS)); 106 } 107 108 public void testReset_whileRunning() { 109 ticker.advance(1); 110 stopwatch.start(); 111 assertEquals(0, stopwatch.elapsed(NANOSECONDS)); 112 ticker.advance(2); 113 assertEquals(2, stopwatch.elapsed(NANOSECONDS)); 114 stopwatch.reset(); 115 assertFalse(stopwatch.isRunning()); 116 ticker.advance(3); 117 assertEquals(0, stopwatch.elapsed(NANOSECONDS)); 118 } 119 120 public void testElapsed_whileRunning() { 121 ticker.advance(78); 122 stopwatch.start(); 123 assertEquals(0, stopwatch.elapsed(NANOSECONDS)); 124 125 ticker.advance(345); 126 assertEquals(345, stopwatch.elapsed(NANOSECONDS)); 127 } 128 129 public void testElapsed_notRunning() { 130 ticker.advance(1); 131 stopwatch.start(); 132 ticker.advance(4); 133 stopwatch.stop(); 134 ticker.advance(9); 135 assertEquals(4, stopwatch.elapsed(NANOSECONDS)); 136 } 137 138 public void testElapsed_multipleSegments() { 139 stopwatch.start(); 140 ticker.advance(9); 141 stopwatch.stop(); 142 143 ticker.advance(16); 144 145 stopwatch.start(); 146 assertEquals(9, stopwatch.elapsed(NANOSECONDS)); 147 ticker.advance(25); 148 assertEquals(34, stopwatch.elapsed(NANOSECONDS)); 149 150 stopwatch.stop(); 151 ticker.advance(36); 152 assertEquals(34, stopwatch.elapsed(NANOSECONDS)); 153 } 154 155 public void testElapsed_micros() { 156 stopwatch.start(); 157 ticker.advance(999); 158 assertEquals(0, stopwatch.elapsed(MICROSECONDS)); 159 ticker.advance(1); 160 assertEquals(1, stopwatch.elapsed(MICROSECONDS)); 161 } 162 163 public void testElapsed_millis() { 164 stopwatch.start(); 165 ticker.advance(999999); 166 assertEquals(0, stopwatch.elapsed(MILLISECONDS)); 167 ticker.advance(1); 168 assertEquals(1, stopwatch.elapsed(MILLISECONDS)); 169 } 170 171 public void testElapsedMillis() { 172 stopwatch.start(); 173 ticker.advance(999999); 174 assertEquals(0, stopwatch.elapsed(MILLISECONDS)); 175 ticker.advance(1); 176 assertEquals(1, stopwatch.elapsed(MILLISECONDS)); 177 } 178 179 public void testElapsedMillis_whileRunning() { 180 ticker.advance(78000000); 181 stopwatch.start(); 182 assertEquals(0, stopwatch.elapsed(MILLISECONDS)); 183 184 ticker.advance(345000000); 185 assertEquals(345, stopwatch.elapsed(MILLISECONDS)); 186 } 187 188 public void testElapsedMillis_notRunning() { 189 ticker.advance(1000000); 190 stopwatch.start(); 191 ticker.advance(4000000); 192 stopwatch.stop(); 193 ticker.advance(9000000); 194 assertEquals(4, stopwatch.elapsed(MILLISECONDS)); 195 } 196 197 public void testElapsedMillis_multipleSegments() { 198 stopwatch.start(); 199 ticker.advance(9000000); 200 stopwatch.stop(); 201 202 ticker.advance(16000000); 203 204 stopwatch.start(); 205 assertEquals(9, stopwatch.elapsed(MILLISECONDS)); 206 ticker.advance(25000000); 207 assertEquals(34, stopwatch.elapsed(MILLISECONDS)); 208 209 stopwatch.stop(); 210 ticker.advance(36000000); 211 assertEquals(34, stopwatch.elapsed(MILLISECONDS)); 212 } 213 214 @GwtIncompatible("String.format()") 215 public void testToString() { 216 stopwatch.start(); 217 assertEquals("0.000 ns", stopwatch.toString()); 218 ticker.advance(1); 219 assertEquals("1.000 ns", stopwatch.toString()); 220 ticker.advance(998); 221 assertEquals("999.0 ns", stopwatch.toString()); 222 ticker.advance(1); 223 assertEquals("1.000 \u03bcs", stopwatch.toString()); 224 ticker.advance(1); 225 assertEquals("1.001 \u03bcs", stopwatch.toString()); 226 ticker.advance(8998); 227 assertEquals("9.999 \u03bcs", stopwatch.toString()); 228 stopwatch.reset(); 229 stopwatch.start(); 230 ticker.advance(1234567); 231 assertEquals("1.235 ms", stopwatch.toString()); 232 stopwatch.reset(); 233 stopwatch.start(); 234 ticker.advance(5000000000L); 235 assertEquals("5.000 s", stopwatch.toString()); 236 } 237 238 } 239
