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/*
* Copyright (C) 2008 The Guava Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.common.base;
import static java.util.concurrent.TimeUnit.MICROSECONDS;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.concurrent.TimeUnit.NANOSECONDS;
import com.google.common.annotations.GwtCompatible;
import com.google.common.testing.FakeTicker;
import junit.framework.TestCase;
/**
* Unit test for {@link Stopwatch}.
*
* @author Kevin Bourrillion
*/
@GwtCompatible
public class StopwatchTest extends TestCase {
private final FakeTicker ticker = new FakeTicker();
private final Stopwatch stopwatch = new Stopwatch(ticker);
public void testCreateStarted() {
Stopwatch startedStopwatch = Stopwatch.createStarted();
assertTrue(startedStopwatch.isRunning());
}
public void testCreateUnstarted() {
Stopwatch unstartedStopwatch = Stopwatch.createUnstarted();
assertFalse(unstartedStopwatch.isRunning());
assertEquals(0, unstartedStopwatch.elapsed(NANOSECONDS));
}
public void testInitialState() {
assertFalse(stopwatch.isRunning());
assertEquals(0, stopwatch.elapsed(NANOSECONDS));
}
public void testStart() {
assertSame(stopwatch, stopwatch.start());
assertTrue(stopwatch.isRunning());
}
public void testStart_whileRunning() {
stopwatch.start();
try {
stopwatch.start();
fail();
} catch (IllegalStateException expected) {
}
assertTrue(stopwatch.isRunning());
}
public void testStop() {
stopwatch.start();
assertSame(stopwatch, stopwatch.stop());
assertFalse(stopwatch.isRunning());
}
public void testStop_new() {
try {
stopwatch.stop();
fail();
} catch (IllegalStateException expected) {
}
assertFalse(stopwatch.isRunning());
}
public void testStop_alreadyStopped() {
stopwatch.start();
stopwatch.stop();
try {
stopwatch.stop();
fail();
} catch (IllegalStateException expected) {
}
assertFalse(stopwatch.isRunning());
}
public void testReset_new() {
ticker.advance(1);
stopwatch.reset();
assertFalse(stopwatch.isRunning());
ticker.advance(2);
assertEquals(0, stopwatch.elapsed(NANOSECONDS));
stopwatch.start();
ticker.advance(3);
assertEquals(3, stopwatch.elapsed(NANOSECONDS));
}
public void testReset_whileRunning() {
ticker.advance(1);
stopwatch.start();
assertEquals(0, stopwatch.elapsed(NANOSECONDS));
ticker.advance(2);
assertEquals(2, stopwatch.elapsed(NANOSECONDS));
stopwatch.reset();
assertFalse(stopwatch.isRunning());
ticker.advance(3);
assertEquals(0, stopwatch.elapsed(NANOSECONDS));
}
public void testElapsed_whileRunning() {
ticker.advance(78);
stopwatch.start();
assertEquals(0, stopwatch.elapsed(NANOSECONDS));
ticker.advance(345);
assertEquals(345, stopwatch.elapsed(NANOSECONDS));
}
public void testElapsed_notRunning() {
ticker.advance(1);
stopwatch.start();
ticker.advance(4);
stopwatch.stop();
ticker.advance(9);
assertEquals(4, stopwatch.elapsed(NANOSECONDS));
}
public void testElapsed_multipleSegments() {
stopwatch.start();
ticker.advance(9);
stopwatch.stop();
ticker.advance(16);
stopwatch.start();
assertEquals(9, stopwatch.elapsed(NANOSECONDS));
ticker.advance(25);
assertEquals(34, stopwatch.elapsed(NANOSECONDS));
stopwatch.stop();
ticker.advance(36);
assertEquals(34, stopwatch.elapsed(NANOSECONDS));
}
public void testElapsed_micros() {
stopwatch.start();
ticker.advance(999);
assertEquals(0, stopwatch.elapsed(MICROSECONDS));
ticker.advance(1);
assertEquals(1, stopwatch.elapsed(MICROSECONDS));
}
public void testElapsed_millis() {
stopwatch.start();
ticker.advance(999999);
assertEquals(0, stopwatch.elapsed(MILLISECONDS));
ticker.advance(1);
assertEquals(1, stopwatch.elapsed(MILLISECONDS));
}
public void testToString() {
stopwatch.start();
assertEquals("0.000 ns", stopwatch.toString());
ticker.advance(1);
assertEquals("1.000 ns", stopwatch.toString());
ticker.advance(998);
assertEquals("999.0 ns", stopwatch.toString());
ticker.advance(1);
assertEquals("1.000 \u03bcs", stopwatch.toString());
ticker.advance(1);
assertEquals("1.001 \u03bcs", stopwatch.toString());
ticker.advance(8998);
assertEquals("9.999 \u03bcs", stopwatch.toString());
stopwatch.reset();
stopwatch.start();
ticker.advance(1234567);
assertEquals("1.235 ms", stopwatch.toString());
stopwatch.reset();
stopwatch.start();
ticker.advance(5000000000L);
assertEquals("5.000 s", stopwatch.toString());
stopwatch.reset();
stopwatch.start();
ticker.advance((long) (1.5 * 60 * 1000000000L));
assertEquals("1.500 min", stopwatch.toString());
stopwatch.reset();
stopwatch.start();
ticker.advance((long) (2.5 * 60 * 60 * 1000000000L));
assertEquals("2.500 h", stopwatch.toString());
stopwatch.reset();
stopwatch.start();
ticker.advance((long) (7.25 * 24 * 60 * 60 * 1000000000L));
assertEquals("7.250 d", stopwatch.toString());
}
}
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