Fixing org.opensearch.common.network.InetAddressesTests.testForString…

…IPv6WithScopeIdInput (#1913) (#1914)

Signed-off-by: Andriy Redko <andriy.redko@aiven.io>

server/src/test/java/org/opensearch/common/network/InetAddressesTests.java

@@ -33,11 +33,18 @@
 import org.opensearch.test.OpenSearchTestCase;
 import org.hamcrest.Matchers;
 
+import java.net.Inet6Address;
 import java.net.InetAddress;
 import java.net.NetworkInterface;
 import java.net.UnknownHostException;
+import java.util.Collections;
 import java.util.Enumeration;
 
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.CoreMatchers.not;
+import static org.hamcrest.CoreMatchers.nullValue;
+import static org.junit.Assume.assumeThat;
+
 public class InetAddressesTests extends OpenSearchTestCase {
     public void testForStringBogusInput() {
         String[] bogusInputs = {
@@ -147,11 +154,12 @@ public void testForStringIPv6WithScopeIdInput() throws java.io.IOException {
         String scopeId = null;
         while (interfaces.hasMoreElements()) {
             final NetworkInterface nint = interfaces.nextElement();
-            if (nint.isLoopback()) {
+            if (nint.isLoopback() && Collections.list(nint.getInetAddresses()).stream().anyMatch(Inet6Address.class::isInstance)) {
                 scopeId = nint.getName();
                 break;
             }
         }
+        assumeThat("The loopback interface has no IPv6 address assigned", scopeId, is(not(nullValue())));
         assertNotNull(scopeId);
         String ipStr = "0:0:0:0:0:0:0:1%" + scopeId;
         InetAddress ipv6Addr = InetAddress.getByName(ipStr);