1 files changed, 6 insertions, 9 deletions
diff --git a/src/test/java/org/apache/commons/io/input/ObservableInputStreamTest.java b/src/test/java/org/apache/commons/io/input/ObservableInputStreamTest.java
index 0a0e9150..8c099ade 100644
--- a/src/test/java/org/apache/commons/io/input/ObservableInputStreamTest.java
+++ b/src/test/java/org/apache/commons/io/input/ObservableInputStreamTest.java
@@ -35,7 +35,7 @@ import org.junit.jupiter.api.Test;
  */
 public class ObservableInputStreamTest {
 
-    private static class DataViewObserver extends MethodCountObserver {
+    private static final class DataViewObserver extends MethodCountObserver {
         private byte[] buffer;
         private int lastValue = -1;
         private int length = -1;
@@ -55,7 +55,7 @@ public class ObservableInputStreamTest {
         }
     }
 
-    private static class LengthObserver extends Observer {
+    private static final class LengthObserver extends Observer {
         private long total;
 
         @Override
@@ -153,8 +153,7 @@ public class ObservableInputStreamTest {
      */
     @Test
     public void testDataByteCalled_add() throws Exception {
-        final byte[] buffer = MessageDigestCalculatingInputStreamTest
-            .generateRandomByteStream(IOUtils.DEFAULT_BUFFER_SIZE);
+        final byte[] buffer = MessageDigestInputStreamTest.generateRandomByteStream(IOUtils.DEFAULT_BUFFER_SIZE);
         final DataViewObserver lko = new DataViewObserver();
         try (ObservableInputStream ois = new ObservableInputStream(new ByteArrayInputStream(buffer))) {
             assertEquals(-1, lko.lastValue);
@@ -185,8 +184,7 @@ public class ObservableInputStreamTest {
      */
     @Test
     public void testDataByteCalled_ctor() throws Exception {
-        final byte[] buffer = MessageDigestCalculatingInputStreamTest
-            .generateRandomByteStream(IOUtils.DEFAULT_BUFFER_SIZE);
+        final byte[] buffer = MessageDigestInputStreamTest.generateRandomByteStream(IOUtils.DEFAULT_BUFFER_SIZE);
         final DataViewObserver lko = new DataViewObserver();
         try (ObservableInputStream ois = new ObservableInputStream(new ByteArrayInputStream(buffer), lko)) {
             assertEquals(-1, lko.lastValue);
@@ -216,10 +214,9 @@ public class ObservableInputStreamTest {
      */
     @Test
     public void testDataBytesCalled() throws Exception {
-        final byte[] buffer = MessageDigestCalculatingInputStreamTest
-            .generateRandomByteStream(IOUtils.DEFAULT_BUFFER_SIZE);
+        final byte[] buffer = MessageDigestInputStreamTest.generateRandomByteStream(IOUtils.DEFAULT_BUFFER_SIZE);
         try (ByteArrayInputStream bais = new ByteArrayInputStream(buffer);
-            final ObservableInputStream ois = new ObservableInputStream(bais)) {
+                final ObservableInputStream ois = new ObservableInputStream(bais)) {
             final DataViewObserver observer = new DataViewObserver();
             final byte[] readBuffer = new byte[23];
             assertNull(observer.buffer);