diff --git a/core-java/src/main/resources/sample.txt b/core-java/src/main/resources/sample.txt
new file mode 100644
index 0000000000..20f137b416
--- /dev/null
+++ b/core-java/src/main/resources/sample.txt
@@ -0,0 +1,2 @@
+line 1
+a second line
\ No newline at end of file
diff --git a/core-java/src/test/java/org/baeldung/java/io/JavaXToInputStreamUnitTest.java b/core-java/src/test/java/org/baeldung/java/io/JavaXToInputStreamUnitTest.java
index e6a89cb3b0..f58d66818b 100644
--- a/core-java/src/test/java/org/baeldung/java/io/JavaXToInputStreamUnitTest.java
+++ b/core-java/src/test/java/org/baeldung/java/io/JavaXToInputStreamUnitTest.java
@@ -1,18 +1,22 @@
 package org.baeldung.java.io;
 
 import java.io.ByteArrayInputStream;
+import java.io.File;
+import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 
+import org.apache.commons.io.FileUtils;
 import org.apache.commons.io.IOUtils;
 import org.apache.commons.io.input.ReaderInputStream;
 import org.junit.Test;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import com.google.common.io.ByteSource;
 import com.google.common.io.CharSource;
+import com.google.common.io.Files;
 
-@SuppressWarnings("unused")
 public class JavaXToInputStreamUnitTest {
     protected final Logger logger = LoggerFactory.getLogger(getClass());
 
@@ -22,20 +26,68 @@ public class JavaXToInputStreamUnitTest {
     public final void givenUsingPlainJava_whenConvertingStringToInputStream_thenCorrect() throws IOException {
         final String initialString = "text";
         final InputStream targetStream = new ByteArrayInputStream(initialString.getBytes());
+
+        IOUtils.closeQuietly(targetStream);
     }
 
     @Test
     public final void givenUsingGuava_whenConvertingStringToInputStream_thenCorrect() throws IOException {
         final String initialString = "text";
         final InputStream targetStream = new ReaderInputStream(CharSource.wrap(initialString).openStream());
+
+        IOUtils.closeQuietly(targetStream);
     }
 
     @Test
     public final void givenUsingCommonsIO_whenConvertingStringToInputStream_thenCorrect() throws IOException {
         final String initialString = "text";
         final InputStream targetStream = IOUtils.toInputStream(initialString);
+
+        IOUtils.closeQuietly(targetStream);
     }
 
-    //
+    // byte array - InputStream
+
+    @Test
+    public final void givenUsingPlainJava_whenConvertingByteArrayToInputStream_thenCorrect() throws IOException {
+        final byte[] initialArray = { 0, 1, 2 };
+        final InputStream targetStream = new ByteArrayInputStream(initialArray);
+
+        IOUtils.closeQuietly(targetStream);
+    }
+
+    @Test
+    public final void givenUsingGuava_whenConvertingByteArrayToInputStream_thenCorrect() throws IOException {
+        final byte[] initialArray = { 0, 1, 2 };
+        final InputStream targetStream = ByteSource.wrap(initialArray).openStream();
+
+        IOUtils.closeQuietly(targetStream);
+    }
+
+    // File - InputStream
+
+    @Test
+    public final void givenUsingPlainJava_whenConvertingFileToInputStream_thenCorrect() throws IOException {
+        final File initialFile = new File("src/main/resources/sample.txt");
+        final InputStream targetStream = new FileInputStream(initialFile);
+
+        IOUtils.closeQuietly(targetStream);
+    }
+
+    @Test
+    public final void givenUsingGuava_whenConvertingFileToInputStream_thenCorrect() throws IOException {
+        final File initialFile = new File("src/main/resources/sample.txt");
+        final InputStream targetStream = Files.asByteSource(initialFile).openStream();
+
+        IOUtils.closeQuietly(targetStream);
+    }
+
+    @Test
+    public final void givenUsingCommonsIO_whenConvertingFileToInputStream_thenCorrect() throws IOException {
+        final File initialFile = new File("src/main/resources/sample.txt");
+        final InputStream targetStream = FileUtils.openInputStream(initialFile);
+
+        IOUtils.closeQuietly(targetStream);
+    }
 
 }