java testing work

core-java/src/test/java/org/baeldung/java/io/JavaXToByteArrayUnitTest.java

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+package org.baeldung.java.io;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class JavaXToByteArrayUnitTest {
+    protected final Logger logger = LoggerFactory.getLogger(getClass());
+
+    // tests - X to Byte Array
+
+}

core-java/src/test/java/org/baeldung/java/io/JavaXToWriterUnitTest.java

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+package org.baeldung.java.io;
+
+import java.io.IOException;
+import java.io.StringWriter;
+import java.io.Writer;
+
+import org.apache.commons.io.output.StringBuilderWriter;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.io.CharSink;
+
+public class JavaXToWriterUnitTest {
+    protected final Logger logger = LoggerFactory.getLogger(getClass());
+
+    // tests - byte[] to Writer
+
+    @Test
+    public void givenPlainJava_whenConvertingByteArrayIntoWriter_thenCorrect() throws IOException {
+        final byte[] initialArray = "With Java".getBytes();
+
+        final Writer targetWriter = new StringWriter().append(new String(initialArray));
+
+        targetWriter.close();
+    }
+
+    @Test
+    public void givenUsingGuava_whenConvertingByteArrayIntoWriter_thenCorrect() throws IOException {
+        final byte[] initialArray = "With Guava".getBytes();
+
+        final String buffer = new String(initialArray);
+        final StringWriter stringWriter = new StringWriter();
+        final CharSink charSink = new CharSink() {
+            @Override
+            public final Writer openStream() throws IOException {
+                return stringWriter;
+            }
+        };
+        charSink.write(buffer);
+
+        stringWriter.close();
+    }
+
+    @Test
+    public void givenUsingCommonsIO_whenConvertingByteArrayIntoWriter_thenCorrect() throws IOException {
+        final byte[] initialArray = "With Commons IO".getBytes();
+        final Writer targetWriter = new StringBuilderWriter(new StringBuilder(new String(initialArray)));
+
+        targetWriter.close();
+    }
+
+}