return list in engine_getClientVersionV1 response (#7663)

Signed-off-by: 7suyash7 <suyashnyn1@gmail.com>
Signed-off-by: Sally MacFarlane <macfarla.github@gmail.com>
Co-authored-by: Sally MacFarlane <macfarla.github@gmail.com>

Author: 7suyash7

ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/engine/EngineGetClientVersionV1.java

@@ -22,6 +22,9 @@
 import org.hyperledger.besu.ethereum.api.jsonrpc.internal.response.JsonRpcSuccessResponse;
 import org.hyperledger.besu.ethereum.api.jsonrpc.internal.results.EngineGetClientVersionResultV1;
 
+import java.util.Collections;
+import java.util.List;
+
 import io.vertx.core.Vertx;
 
 public class EngineGetClientVersionV1 extends ExecutionEngineJsonRpcMethod {
@@ -51,9 +54,10 @@ public String getName() {
   public JsonRpcResponse syncResponse(final JsonRpcRequestContext request) {
     String safeCommit =
         (commit != null && commit.length() >= 8) ? commit.substring(0, 8) : "unknown";
-    return new JsonRpcSuccessResponse(
-        request.getRequest().getId(),
-        new EngineGetClientVersionResultV1(
-            ENGINE_CLIENT_CODE, ENGINE_CLIENT_NAME, clientVersion, safeCommit));
+    List<EngineGetClientVersionResultV1> versions =
+        Collections.singletonList(
+            new EngineGetClientVersionResultV1(
+                ENGINE_CLIENT_CODE, ENGINE_CLIENT_NAME, clientVersion, safeCommit));
+    return new JsonRpcSuccessResponse(request.getRequest().getId(), versions);
   }
 }

ethereum/api/src/test/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/engine/EngineGetClientVersionV1Test.java

@@ -23,6 +23,8 @@
 import org.hyperledger.besu.ethereum.api.jsonrpc.internal.response.JsonRpcSuccessResponse;
 import org.hyperledger.besu.ethereum.api.jsonrpc.internal.results.EngineGetClientVersionResultV1;
 
+import java.util.List;
+
 import io.vertx.core.Vertx;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
@@ -61,9 +63,18 @@ void testSyncResponse() {
 
     assertThat(actualResult).isInstanceOf(JsonRpcSuccessResponse.class);
     JsonRpcSuccessResponse successResponse = (JsonRpcSuccessResponse) actualResult;
-    assertThat(successResponse.getResult()).isInstanceOf(EngineGetClientVersionResultV1.class);
+
+    assertThat(successResponse.getResult()).isInstanceOf(List.class);
+
+    List<?> resultList = (List<?>) successResponse.getResult();
+    assertThat(resultList).hasSize(1);
+
+    Object firstElement = resultList.get(0);
+    assertThat(firstElement).isInstanceOf(EngineGetClientVersionResultV1.class);
+
     EngineGetClientVersionResultV1 actualEngineGetClientVersionResultV1 =
-        (EngineGetClientVersionResultV1) successResponse.getResult();
+        (EngineGetClientVersionResultV1) firstElement;
+
     assertThat(actualEngineGetClientVersionResultV1.getName()).isEqualTo(ENGINE_CLIENT_NAME);
     assertThat(actualEngineGetClientVersionResultV1.getCode()).isEqualTo(ENGINE_CLIENT_CODE);
     assertThat(actualEngineGetClientVersionResultV1.getVersion()).isEqualTo(CLIENT_VERSION);