Add test assertion
diff --git a/src/test/java/org/apache/commons/io/input/ChecksumInputStreamTest.java b/src/test/java/org/apache/commons/io/input/ChecksumInputStreamTest.java
index 94290bc..65e6f73 100644
--- a/src/test/java/org/apache/commons/io/input/ChecksumInputStreamTest.java
+++ b/src/test/java/org/apache/commons/io/input/ChecksumInputStreamTest.java
@@ -145,8 +145,7 @@
                 .get()) {
                 // @formatter:on
             assertEquals(0, checksum.getByteCount());
-            @SuppressWarnings("unused")
-            final int intOne = checksum.read(byteArray);
+            assertEquals(4, checksum.read(byteArray));
             assertEquals(byteArray.length, checksum.getByteCount());
             assertEquals(29, checksum.getRemaining());
             final long skipReturnValue = checksum.skip((byte) 1);