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BAEL-8404 create an array of N random bytes #17450

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Merged
merged 1 commit into from
Aug 27, 2024
Merged

BAEL-8404 create an array of N random bytes #17450

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13 changes: 11 additions & 2 deletions core-java-modules/core-java-arrays-operations-basic-2/pom.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -12,13 +12,22 @@
<groupId>com.baeldung.core-java-modules</groupId>
<version>0.0.1-SNAPSHOT</version>
</parent>

<properties>
<commons-rng.version>1.6</commons-rng.version>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.14.0</version>
<version>${commons-lang3.version}</version>
</dependency>

<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-rng-simple</artifactId>
<version>${commons-rng.version}</version>
</dependency>

<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
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51 changes: 51 additions & 0 deletions ...-operations-basic-2/src/test/java/com/baeldung/array/randombytes/RandomByteArrayTest.java
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@@ -0,0 +1,51 @@
package com.baeldung.array.randombytes;

import org.apache.commons.lang3.RandomUtils;
import org.apache.commons.rng.UniformRandomProvider;
import org.apache.commons.rng.simple.RandomSource;
import org.junit.jupiter.api.Test;

import java.security.SecureRandom;
import java.util.Random;

import static org.junit.jupiter.api.Assertions.assertEquals;

public class RandomByteArrayTest {

int SIZE = 16;

@Test
public void givenSizeWhenGenerateUsingRandomThenOK() {
byte[] byteArray = new byte[SIZE];
Random random = new Random();
random.nextBytes(byteArray);

assertEquals(SIZE, byteArray.length);
}

@Test
public void givenSizeWhenGenerateUsingSecureRandomThenOK() {
byte[] byteArray = new byte[SIZE];
SecureRandom secureRandom = new SecureRandom();
secureRandom.nextBytes(byteArray);

assertEquals(SIZE, byteArray.length);
}

@Test
public void givenSizeWhenGenerateUsingRandomUtilsThenOK() {
byte[] byteArray = RandomUtils.nextBytes(SIZE);

assertEquals(SIZE, byteArray.length);
}

@Test
public void givenSizeWhenGenerateUsingUniformRandomProviderThenOK() {
byte[] byteArray = new byte[SIZE];
UniformRandomProvider randomProvider = RandomSource.XO_RO_SHI_RO_128_PP.create();
randomProvider.nextBytes(byteArray);

assertEquals(SIZE, byteArray.length);
}

}