diff --git a/server/src/test/java/org/opensearch/cluster/metadata/IndexMetadataTests.java b/server/src/test/java/org/opensearch/cluster/metadata/IndexMetadataTests.java
index c3ff14c9a6c9b..92988ab7e9cba 100644
--- a/server/src/test/java/org/opensearch/cluster/metadata/IndexMetadataTests.java
+++ b/server/src/test/java/org/opensearch/cluster/metadata/IndexMetadataTests.java
@@ -249,6 +249,7 @@ public void testWriteVerifiableTo() throws IOException {
         BytesStreamOutput out = new BytesStreamOutput();
         BufferedChecksumStreamOutput checksumOut = new BufferedChecksumStreamOutput(out);
         metadata1.writeVerifiableTo(checksumOut);
+        assertNotNull(metadata1.toString());
 
         IndexMetadata metadata2 = IndexMetadata.builder(metadata1.getIndex().getName())
             .settings(