diff --git a/rule-engine/rule-engine-components/src/test/java/org/thingsboard/rule/engine/transform/TbCopyFromMdToMsgNodeTest.java b/rule-engine/rule-engine-components/src/test/java/org/thingsboard/rule/engine/transform/TbCopyFromMdToMsgNodeTest.java
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+++ b/rule-engine/rule-engine-components/src/test/java/org/thingsboard/rule/engine/transform/TbCopyFromMdToMsgNodeTest.java
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+/**
+ * Copyright © 2016-2022 The Thingsboard Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.thingsboard.rule.engine.transform;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.ArgumentCaptor;
+import org.thingsboard.common.util.JacksonUtil;
+import org.thingsboard.rule.engine.api.TbContext;
+import org.thingsboard.rule.engine.api.TbNodeConfiguration;
+import org.thingsboard.rule.engine.api.TbNodeException;
+import org.thingsboard.server.common.data.id.DeviceId;
+import org.thingsboard.server.common.data.id.EntityId;
+import org.thingsboard.server.common.msg.TbMsg;
+import org.thingsboard.server.common.msg.TbMsgMetaData;
+import org.thingsboard.server.common.msg.queue.TbMsgCallback;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+public class TbCopyFromMdToMsgNodeTest {
+    final ObjectMapper mapper = new ObjectMapper();
+
+    DeviceId deviceId;
+    TbCopyFromMdToMsgNode node;
+    TbCopyFromMdToMsgNodeConfiguration config;
+    TbNodeConfiguration nodeConfiguration;
+    TbContext ctx;
+    TbMsgCallback callback;
+
+    @BeforeEach
+    void setUp() throws TbNodeException {
+        deviceId = new DeviceId(UUID.randomUUID());
+        callback = mock(TbMsgCallback.class);
+        ctx = mock(TbContext.class);
+        config = new TbCopyFromMdToMsgNodeConfiguration().defaultConfiguration();
+        config.setMetadataMsgKeys(List.of("TestKey_1", "TestKey_2", "TestKey_3"));
+        nodeConfiguration = new TbNodeConfiguration(mapper.valueToTree(config));
+        node = spy(new TbCopyFromMdToMsgNode());
+        node.init(ctx, nodeConfiguration);
+    }
+
+    @AfterEach
+    void tearDown() {
+        node.destroy();
+    }
+
+    @Test
+    void givenDefaultConfig_whenInit_thenOK() {
+        assertThat(node.config).isEqualTo(config);
+    }
+
+    @Test
+    void givenDefaultConfig_whenVerify_thenOK() {
+        TbCopyFromMdToMsgNodeConfiguration defaultConfig = new TbCopyFromMdToMsgNodeConfiguration().defaultConfiguration();
+        assertThat(defaultConfig.getMetadataMsgKeys()).isEqualTo(Collections.emptyList());
+    }
+
+    @Test
+    void givenMsg_whenOnMsg_thenVerifyOutput() throws Exception {
+        String data = "{}";
+        node.onMsg(ctx, getTbMsg(deviceId, data));
+
+        ArgumentCaptor<TbMsg> newMsgCaptor = ArgumentCaptor.forClass(TbMsg.class);
+        verify(ctx, times(1)).tellSuccess(newMsgCaptor.capture());
+        verify(ctx, never()).tellFailure(any(), any());
+
+        TbMsg newMsg = newMsgCaptor.getValue();
+        assertThat(newMsg).isNotNull();
+
+        JsonNode dataNode = JacksonUtil.toJsonNode(newMsg.getData());
+        assertThat(dataNode.has("TestKey_1")).isEqualTo(true);
+    }
+
+    @Test
+    void givenEmptyKeys_whenOnMsg_thenVerifyOutput() throws Exception {
+        TbCopyFromMdToMsgNodeConfiguration defaultConfig = new TbCopyFromMdToMsgNodeConfiguration().defaultConfiguration();
+        nodeConfiguration = new TbNodeConfiguration(mapper.valueToTree(defaultConfig));
+        node.init(ctx, nodeConfiguration);
+
+        String data = "{}";
+        node.onMsg(ctx, getTbMsg(deviceId, data));
+
+        ArgumentCaptor<TbMsg> newMsgCaptor = ArgumentCaptor.forClass(TbMsg.class);
+        verify(ctx, times(1)).tellSuccess(newMsgCaptor.capture());
+        verify(ctx, never()).tellFailure(any(), any());
+
+        TbMsg newMsg = newMsgCaptor.getValue();
+        assertThat(newMsg).isNotNull();
+
+        assertThat(newMsg.getData()).isEqualTo(data);
+    }
+
+    @Test
+    void givenMsgDataNotJSONObject_whenOnMsg_thenTellFailure() throws Exception {
+        String data = "[]";
+        node.onMsg(ctx, getTbMsg(deviceId, data));
+
+        ArgumentCaptor<TbMsg> newMsgCaptor = ArgumentCaptor.forClass(TbMsg.class);
+        ArgumentCaptor<Exception> exceptionCaptor = ArgumentCaptor.forClass(Exception.class);
+        verify(ctx, never()).tellSuccess(any());
+        verify(ctx, times(1)).tellFailure(newMsgCaptor.capture(), exceptionCaptor.capture());
+
+        assertThat(exceptionCaptor.getValue()).isInstanceOf(RuntimeException.class);
+    }
+
+    private TbMsg getTbMsg(EntityId entityId, String data) {
+        final Map<String, String> mdMap = Map.of(
+                "TestKey_1", "Test",
+                "country", "US",
+                "city", "NY"
+        );
+        return TbMsg.newMsg("POST_ATTRIBUTES_REQUEST", entityId, new TbMsgMetaData(mdMap), data, callback);
+    }
+}
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