add a maven pom, and a basic unit test, to StringCT-java

.gitignore

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+# c
+*.o
+
+# Maven
+target
+
+# Intellij IDEA
+.idea
+*.iml
+

source-code/StringCT-java/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>research-lab</groupId>
+  <artifactId>StringCT</artifactId>
+  <version>0-SNAPSHOT</version>
+
+  <properties>
+    <maven.compiler.source>1.8</maven.compiler.source>
+    <maven.compiler.target>1.8</maven.compiler.target>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+    <!-- Dependency versions -->
+    <junit.version>4.12</junit.version>
+    <bcprov-jdk15on.version>1.59</bcprov-jdk15on.version>
+    <commons-pool2.version>2.4.2</commons-pool2.version>
+    <commons-codec.version>1.10</commons-codec.version>
+  </properties>
+
+  <dependencies>
+
+    <dependency>
+      <groupId>org.bouncycastle</groupId>
+      <artifactId>bcprov-debug-jdk15on</artifactId>
+      <version>${bcprov-jdk15on.version}</version>
+    </dependency>
+
+    <dependency>
+      <groupId>org.apache.commons</groupId>
+      <artifactId>commons-pool2</artifactId>
+      <version>${commons-pool2.version}</version>
+    </dependency>
+
+    <dependency>
+      <groupId>commons-codec</groupId>
+      <artifactId>commons-codec</artifactId>
+      <version>${commons-codec.version}</version>
+    </dependency>
+
+    <!--
+    ==========
+    Test scope
+    ==========
+    -->
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>${junit.version}</version>
+      <scope>test</scope>
+    </dependency>
+
+  </dependencies>
+
+  <build>
+    <sourceDirectory>${project.basedir}/src</sourceDirectory>
+    <testSourceDirectory>${project.basedir}/test</testSourceDirectory>
+    <plugins>
+      <plugin>
+        <artifactId>maven-surefire-plugin</artifactId>
+        <version>2.18.1</version>
+        <configuration>
+          <forkCount>1</forkCount>
+          <reuseForks>false</reuseForks>
+        </configuration>
+      </plugin>
+      <plugin>
+        <version>3.0.1</version>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-source-plugin</artifactId>
+        <executions>
+          <execution>
+            <id>attach-sources</id>
+            <phase>verify</phase>
+            <goals>
+              <goal>jar-no-fork</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+</project>

source-code/StringCT-java/test/org/nem/core/utils/ArrayUtilsTest.java

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+package org.nem.core.utils;
+
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Arrays;
+import org.junit.Test;
+
+public class ArrayUtilsTest {
+
+  @Test
+  public void duplicate() {
+
+    // Arrange
+    byte[] bytes = "test".getBytes(StandardCharsets.UTF_8);
+    int bytesHash = Arrays.hashCode(bytes);
+
+    // Act
+    byte[] duplicate = ArrayUtils.duplicate(bytes);
+
+    // Assert: original array is unchanged
+    assertEquals(bytesHash, Arrays.hashCode(bytes));
+
+    // Assert: check duplicate
+    assertArrayEquals(bytes, duplicate);
+  }
+}