add test

Signed-off-by: Sandeep Kumawat <2025sandeepkumawat@gmail.com>

plugins/repository-s3/src/test/java/org/opensearch/repositories/s3/S3RetryingInputStreamTests.java

@@ -43,6 +43,8 @@
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
 
 import static org.hamcrest.Matchers.is;
 import static org.mockito.Mockito.any;
@@ -61,6 +63,15 @@ public void testInputStreamFullyConsumed() throws IOException {
         assertThat(stream.isAborted(), is(false));
     }
 
+    public void testInputStreamGetMetadata() throws IOException {
+        final byte[] expectedBytes = randomByteArrayOfLength(randomIntBetween(1, 512));
+
+        final S3RetryingInputStream stream = createInputStream(expectedBytes, 0L, (long) (Integer.MAX_VALUE - 1));
+
+        Map<String, String> metadata = new HashMap<>();
+        assertEquals(stream.getMetadata(), metadata);
+    }
+
     public void testInputStreamIsAborted() throws IOException {
         final byte[] expectedBytes = randomByteArrayOfLength(randomIntBetween(10, 512));
         final byte[] actualBytes = new byte[randomIntBetween(1, Math.max(1, expectedBytes.length - 1))];