77 lines
2.2 KiB
Java
77 lines
2.2 KiB
Java
package com.baeldung.time;
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import static org.junit.Assert.assertEquals;
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import java.time.Duration;
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import java.time.Instant;
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import java.util.concurrent.TimeUnit;
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import org.apache.commons.lang3.time.StopWatch;
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import org.junit.Test;
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public class ElapsedTimeUnitTest {
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@Test
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public void givenRunningTask_whenMeasuringTimeWithCurrentTimeMillis_thenGetElapsedTime() throws InterruptedException {
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long start = System.currentTimeMillis();
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simulateRunningTask();
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long finish = System.currentTimeMillis();
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long timeElapsed = finish - start;
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assertEquals(true, (2000L <= timeElapsed) && (timeElapsed <= 3000L));
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}
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@Test
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public void giveRunningTask_whenMeasuringTimeWithNanoTime_thenGetElapsedTime() throws InterruptedException {
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long start = System.nanoTime();
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simulateRunningTask();
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long finish = System.nanoTime();
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long timeElapsed = finish - start;
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assertEquals(true, (2000000000L <= timeElapsed) && (timeElapsed <= 3000000000L));
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}
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@Test
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public void givenRunningTask_whenMeasuringTimeWithStopWatch_thenGetElapsedTime() throws InterruptedException {
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StopWatch watch = new StopWatch();
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watch.start();
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simulateRunningTask();
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watch.stop();
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long timeElapsed = watch.getTime();
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assertEquals(true, (2000L <= timeElapsed) && (timeElapsed <= 3000L));
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}
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@Test
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public void givenRunningTask_whenMeasuringTimeWithInstantClass_thenGetElapsedTime() throws InterruptedException {
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Instant start = Instant.now();
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simulateRunningTask();
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Instant finish = Instant.now();
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long timeElapsed = Duration.between(start, finish).toMillis();
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assertEquals(true, (2000L <= timeElapsed) && (timeElapsed <= 3000L));
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}
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/**
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* Simulate task running for 2.5 seconds.
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*
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* @throws InterruptedException
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*/
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private static void simulateRunningTask() throws InterruptedException {
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TimeUnit.MILLISECONDS.sleep(2500); // 2.5 seconds
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}
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}
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