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Merge pull request #3343 from tarangbhalodia/master 

BAEL-1422 Guide to ThreadLocalRandom in Java [tarangbhalodia@gmail.com]
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Loredana Crusoveanu 2018-01-03 00:21:52 +02:00 committed by GitHub
parent f6f8f8debe 12a1924cb3
commit 0659c76908
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core-java/src/test/java/com/baeldung/threadlocalrandom/ThreadLocalRandomTest.java Normal file
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package com.baeldung.threadlocalrandom;
import java.util.concurrent.ThreadLocalRandom;
import static org.junit.Assert.assertTrue;
import org.junit.Test;
public class ThreadLocalRandomTest {
@Test
public void givenUsingThreadLocalRandom_whenGeneratingRandomIntBounded_thenCorrect() {
int leftLimit = 1;
int rightLimit = 100;
int generatedInt = ThreadLocalRandom.current().nextInt(leftLimit, rightLimit);
assertTrue(generatedInt < rightLimit && generatedInt >= leftLimit);
}
@Test
public void givenUsingThreadLocalRandom_whenGeneratingRandomIntUnbounded_thenCorrect() {
int generatedInt = ThreadLocalRandom.current().nextInt();
assertTrue(generatedInt < Integer.MAX_VALUE && generatedInt >= Integer.MIN_VALUE);
}
@Test
public void givenUsingThreadLocalRandom_whenGeneratingRandomLongBounded_thenCorrect() {
long leftLimit = 1L;
long rightLimit = 100L;
long generatedLong = ThreadLocalRandom.current().nextLong(leftLimit, rightLimit);
assertTrue(generatedLong < rightLimit && generatedLong >= leftLimit);
}
@Test
public void givenUsingThreadLocalRandom_whenGeneratingRandomLongUnbounded_thenCorrect() {
long generatedInt = ThreadLocalRandom.current().nextLong();
assertTrue(generatedInt < Long.MAX_VALUE && generatedInt >= Long.MIN_VALUE);
}
@Test
public void givenUsingThreadLocalRandom_whenGeneratingRandomDoubleBounded_thenCorrect() {
double leftLimit = 1D;
double rightLimit = 100D;
double generatedInt = ThreadLocalRandom.current().nextDouble(leftLimit, rightLimit);
assertTrue(generatedInt < rightLimit && generatedInt >= leftLimit);
}
@Test
public void givenUsingThreadLocalRandom_whenGeneratingRandomDoubleUnbounded_thenCorrect() {
double generatedInt = ThreadLocalRandom.current().nextDouble();
assertTrue(generatedInt < Double.MAX_VALUE && generatedInt >= Double.MIN_VALUE);
}
@Test(expected = UnsupportedOperationException.class)
public void givenUsingThreadLocalRandom_whenSettingSeed_thenThrowUnsupportedOperationException() {
ThreadLocalRandom.current().setSeed(0l);
}
}