Fix for test script node function

application/src/main/java/org/thingsboard/server/controller/RuleChainController.java

@@ -18,6 +18,7 @@ package org.thingsboard.server.controller;
 import com.fasterxml.jackson.core.type.TypeReference;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ArrayNode;
 import com.fasterxml.jackson.databind.node.ObjectNode;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -432,4 +433,22 @@ public class RuleChainController extends BaseController {
         return objectMapper.writeValueAsString(msgData);
     }
 
+    private String msgToOutput(List<TbMsg> msgs) throws Exception {
+        ArrayNode resultNode = objectMapper.createArrayNode();
+        for (TbMsg msg:msgs) {
+            ObjectNode msgData = objectMapper.createObjectNode();
+            if (!StringUtils.isEmpty(msg.getData())) {
+                msgData.set("msg", objectMapper.readTree(msg.getData()));
+            }
+            Map<String, String> metadata = msg.getMetaData().getData();
+            msgData.set("metadata", objectMapper.valueToTree(metadata));
+            msgData.put("msgType", msg.getType());
+            resultNode.add(msgData);
+        }
+        if (resultNode.size() == 1) {
+            return objectMapper.writeValueAsString(resultNode.get(0));
+        }
+        return objectMapper.writeValueAsString(resultNode);
+    }
+
 }

application/src/main/java/org/thingsboard/server/service/script/RuleNodeJsScriptEngine.java

@@ -108,13 +108,18 @@ public class RuleNodeJsScriptEngine implements org.thingsboard.rule.engine.api.S
     }
 
     @Override
-    public TbMsg executeUpdate(TbMsg msg) throws ScriptException {
+    public List<TbMsg> executeUpdate(TbMsg msg) throws ScriptException {
         JsonNode result = executeScript(msg);
-        if (!result.isObject()) {
+        if (result.isObject()) {
+            return Collections.singletonList(unbindMsg(result, msg));
+        } else if (result.isArray()){
+            List<TbMsg> res = new ArrayList<>(result.size());
+            result.forEach(jsonObject -> res.add(unbindMsg(jsonObject, msg)));
+            return res;
+        } else {
             log.warn("Wrong result type: {}", result.getNodeType());
             throw new ScriptException("Wrong result type: " + result.getNodeType());
         }
-        return unbindMsg(result, msg);
     }
 
     @Override

rule-engine/rule-engine-api/src/main/java/org/thingsboard/rule/engine/api/ScriptEngine.java

@@ -25,7 +25,7 @@ import java.util.Set;
 
 public interface ScriptEngine {
 
-    TbMsg executeUpdate(TbMsg msg) throws ScriptException;
+    List<TbMsg> executeUpdate(TbMsg msg) throws ScriptException;
 
     ListenableFuture<List<TbMsg>> executeUpdateAsync(TbMsg msg);