/*
* ModeShape (http://www.modeshape.org)
*
* 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 org.modeshape.common.statistic;
import static org.hamcrest.core.Is.is;
import static org.hamcrest.number.IsCloseTo.closeTo;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.util.concurrent.TimeUnit;
import org.junit.Before;
import org.junit.Test;
public class StopwatchTest {
private Stopwatch stopwatch;
@Before
public void beforeEach() {
this.stopwatch = new Stopwatch();
}
private void pause( int numberOfMilliseconds ) {
try {
Thread.sleep(numberOfMilliseconds);
} catch (InterruptedException e) {
fail("Error while sleeping for " + numberOfMilliseconds + " milliseconds");
}
}
@Test
public void shouldAllowStartingAndStoppingOnce() {
stopwatch.start();
pause(100);
stopwatch.stop();
assertEquals(1, stopwatch.getCount());
}
@Test
public void shouldAllowStartingAndStoppingMultipleTimes() {
for (int i = 0; i != 3; ++i) {
assertEquals(false, stopwatch.isRunning());
stopwatch.start();
assertEquals(true, stopwatch.isRunning());
pause(100);
stopwatch.stop();
assertEquals(false, stopwatch.isRunning());
}
}
@Test
public void shouldKnowWhenItsRunning() {
assertEquals(false, stopwatch.isRunning());
stopwatch.start();
assertEquals(true, stopwatch.isRunning());
stopwatch.stop();
assertEquals(false, stopwatch.isRunning());
}
@Test
public void shouldAllowStopToBeCalledWhenNotRunning() {
assertEquals(false, stopwatch.isRunning());
stopwatch.stop();
stopwatch.stop();
assertEquals(false, stopwatch.isRunning());
}
@Test
public void shouldAllowStartToBeCalledWhenAlreadyRunning() {
assertEquals(false, stopwatch.isRunning());
stopwatch.start();
assertEquals(true, stopwatch.isRunning());
stopwatch.start();
assertEquals(true, stopwatch.isRunning());
}
@Test
public void shouldReportNumberOfTimesStartedAndStopped() {
for (int i = 0; i != 3; ++i) {
stopwatch.start();
pause(10);
stopwatch.stop();
}
assertEquals(3, stopwatch.getCount());
}
@Test
public void shouldReportTotalTime() {
for (int i = 0; i != 4; ++i) {
stopwatch.start();
pause(100);
stopwatch.stop();
}
assertThat((double)stopwatch.getTotalDuration().getDuration(TimeUnit.MILLISECONDS), is(closeTo(400, 200)));
}
@Test
public void shouldReportAverageTime() {
for (int i = 0; i != 4; ++i) {
stopwatch.start();
pause(100);
stopwatch.stop();
}
assertThat((double)stopwatch.getAverageDuration().getDuration(TimeUnit.MILLISECONDS), is(closeTo(100, 50)));
}
@Test
public void shouldReportMinimumTime() {
for (int i = 0; i != 3; ++i) {
stopwatch.start();
pause(50 * (i + 1));
stopwatch.stop();
}
assertThat((double)stopwatch.getMinimumDuration().getDuration(TimeUnit.MILLISECONDS), is(closeTo(50, 20)));
}
@Test
public void shouldReportMaximumTime() {
for (int i = 0; i != 3; ++i) {
stopwatch.start();
pause(50 * (i + 1));
stopwatch.stop();
}
assertThat((double)stopwatch.getMaximumDuration().getDuration(TimeUnit.MILLISECONDS), is(closeTo(150, 50)));
}
@Test
public void shouldReportValidStatisticsEvenBeforeBeingUsed() {
assertEquals(0, stopwatch.getCount());
assertEquals(0.0d, stopwatch.getTotalDuration().getDuration(TimeUnit.SECONDS), 0.00001);
assertEquals(0.0d, stopwatch.getAverageDuration().getDuration(TimeUnit.SECONDS), 0.00001);
assertEquals(0.0d, stopwatch.getMinimumDuration().getDuration(TimeUnit.SECONDS), 0.00001);
assertEquals(0.0d, stopwatch.getMaximumDuration().getDuration(TimeUnit.SECONDS), 0.00001);
}
@Test
public void shouldReportValidStatisticsAfterBeingReset() {
for (int i = 0; i != 3; ++i) {
stopwatch.start();
pause(10 * (i + 1));
stopwatch.stop();
}
stopwatch.reset();
assertEquals(0, stopwatch.getCount());
assertEquals(0.0d, stopwatch.getTotalDuration().getDuration(TimeUnit.SECONDS), 0.00001);
assertEquals(0.0d, stopwatch.getAverageDuration().getDuration(TimeUnit.SECONDS), 0.00001);
assertEquals(0.0d, stopwatch.getMinimumDuration().getDuration(TimeUnit.SECONDS), 0.00001);
assertEquals(0.0d, stopwatch.getMaximumDuration().getDuration(TimeUnit.SECONDS), 0.00001);
}
@Test
public void shouldHaveStringRepresentationWithoutStatisticsForSingleSample() {
stopwatch.start();
pause(12);
stopwatch.stop();
String str = stopwatch.toString();
System.out.println(str);
assertTrue(str.matches("^\\d{2,}:\\d{2}:\\d{2}\\.\\d{3}(,\\d{1,3})?.*"));
assertFalse(str.matches(".*1 sample.*"));
assertFalse(str.matches(".*min=\\d{2,}:\\d{2}:\\d{2}\\.\\d{3}(,\\d{1,3})?.*"));
assertFalse(str.matches(".*max=\\d{2,}:\\d{2}:\\d{2}\\.\\d{3}(,\\d{1,3})?.*"));
assertFalse(str.matches(".*avg=\\d{2,}:\\d{2}:\\d{2}\\.\\d{3}(,\\d{1,3})?.*"));
assertFalse(str.matches(".*median=\\d{2,}:\\d{2}:\\d{2}\\.\\d{3}(,\\d{1,3})?.*"));
}
@Test
public void shouldHaveStringRepresentationWithStatisticsForMultipleSample() {
for (int i = 0; i != 3; ++i) {
stopwatch.start();
pause(12);
stopwatch.stop();
}
String str = stopwatch.toString();
System.out.println(str);
assertTrue(str.matches("^\\d{2,}:\\d{2}:\\d{2}\\.\\d{3}(,\\d{1,3})?.*"));
assertTrue(str.matches(".*3 samples.*"));
assertTrue(str.matches(".*min=\\d{2,}:\\d{2}:\\d{2}\\.\\d{3}(,\\d{1,3})?.*"));
assertTrue(str.matches(".*max=\\d{2,}:\\d{2}:\\d{2}\\.\\d{3}(,\\d{1,3})?.*"));
assertTrue(str.matches(".*avg=\\d{2,}:\\d{2}:\\d{2}\\.\\d{3}(,\\d{1,3})?.*"));
assertTrue(str.matches(".*median=\\d{2,}:\\d{2}:\\d{2}\\.\\d{3}(,\\d{1,3})?.*"));
}
@Test
public void shouldHaveAHistogramWithZeroSigma() {
for (int i = 0; i != 3; ++i) {
stopwatch.start();
pause(12);
stopwatch.stop();
}
assertNotNull(stopwatch.getHistogram(0));
}
@Test
public void shouldHaveAHistogramWithOneSigma() {
for (int i = 0; i != 3; ++i) {
stopwatch.start();
pause(12);
stopwatch.stop();
}
assertNotNull(stopwatch.getHistogram(1));
}
}