private fields in node

rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/transform/TbRenameKeysNode.java

@@ -46,9 +46,9 @@ import java.util.concurrent.ExecutionException;
 )
 public class TbRenameKeysNode implements TbNode {
 
-    TbRenameKeysNodeConfiguration config;
-    Map<String, String> renameKeysMapping;
-    boolean fromMetadata;
+    private TbRenameKeysNodeConfiguration config;
+    private Map<String, String> renameKeysMapping;
+    private boolean fromMetadata;
 
     @Override
     public void init(TbContext ctx, TbNodeConfiguration configuration) throws TbNodeException {

rule-engine/rule-engine-components/src/test/java/org/thingsboard/rule/engine/transform/TbRenameKeysNodeTest.java

@@ -66,11 +66,6 @@ public class TbRenameKeysNodeTest {
         node.destroy();
     }
 
-    @Test
-    void givenDefaultConfig_whenInit_thenOK() {
-        assertThat(node.config).isEqualTo(config);
-    }
-
     @Test
     void givenDefaultConfig_whenVerify_thenOK() {
         TbRenameKeysNodeConfiguration defaultConfig = new TbRenameKeysNodeConfiguration().defaultConfiguration();