diff --git a/common/transport/mqtt/src/test/java/org/thingsboard/server/transport/mqtt/MqttTransportHandlerTest.java b/common/transport/mqtt/src/test/java/org/thingsboard/server/transport/mqtt/MqttTransportHandlerTest.java
index 65035e61fe..9b6367da30 100644
--- a/common/transport/mqtt/src/test/java/org/thingsboard/server/transport/mqtt/MqttTransportHandlerTest.java
+++ b/common/transport/mqtt/src/test/java/org/thingsboard/server/transport/mqtt/MqttTransportHandlerTest.java
@@ -97,18 +97,6 @@ public class MqttTransportHandlerTest {
         }
     }
 
-    @Test
-    public void givenMessageWithoutFixedHeader_whenProcessMqttMsg_thenProcessDisconnect() {
-        MqttFixedHeader mqttFixedHeader = null;
-        MqttMessage msg = new MqttMessage(mqttFixedHeader);
-        willDoNothing().given(handler).processDisconnect(ctx);
-
-        handler.processMqttMsg(ctx, msg);
-
-        assertThat(handler.address, is(IP_ADDR));
-        verify(handler, times(1)).processDisconnect(ctx);
-    }
-
     MqttConnectMessage getMqttConnectMessage() {
         MqttFixedHeader mqttFixedHeader = new MqttFixedHeader(MqttMessageType.CONNECT, true, MqttQoS.AT_LEAST_ONCE, false, 123);
         MqttConnectVariableHeader variableHeader = new MqttConnectVariableHeader("device", packedId.incrementAndGet(), true, true, true, 1, true, false, 60);
@@ -123,6 +111,18 @@ public class MqttTransportHandlerTest {
         return new MqttPublishMessage(mqttFixedHeader, variableHeader, payload);
     }
 
+    @Test
+    public void givenMessageWithoutFixedHeader_whenProcessMqttMsg_thenProcessDisconnect() {
+        MqttFixedHeader mqttFixedHeader = null;
+        MqttMessage msg = new MqttMessage(mqttFixedHeader);
+        willDoNothing().given(handler).processDisconnect(ctx);
+
+        handler.processMqttMsg(ctx, msg);
+
+        assertThat(handler.address, is(IP_ADDR));
+        verify(handler, times(1)).processDisconnect(ctx);
+    }
+
     @Test
     public void givenMqttConnectMessage_whenProcessMqttMsg_thenProcessConnect() {
         MqttConnectMessage msg = getMqttConnectMessage();
@@ -168,16 +168,18 @@ public class MqttTransportHandlerTest {
 
         assertThat(handler.address, is(IP_ADDR));
         assertThat(handler.deviceSessionCtx.getChannel(), is(ctx));
+        assertThat(handler.deviceSessionCtx.isConnected(), is(false));
         assertThat(handler.deviceSessionCtx.getMsgQueueSize().get(), is(MSG_QUEUE_LIMIT));
         assertThat(handler.deviceSessionCtx.getMsgQueue(), contains(messages.toArray()));
         verify(handler, never()).processDisconnect(any());
         verify(handler, times(1)).processConnect(any(), any());
         verify(handler, times(MSG_QUEUE_LIMIT)).enqueueRegularSessionMsg(any(), any());
+        verify(handler, never()).processRegularSessionMsg(any(), any());
         messages.forEach((msg) -> verify(handler, times(1)).enqueueRegularSessionMsg(ctx, msg));
     }
 
     @Test
-    public void givenMessageQueue_whenProcessMqttMsg_thenEnqueueRegularSessionMsg() throws InterruptedException {
+    public void givenMessageQueue_whenProcessMqttMsgConcurrently_thenEnqueueRegularSessionMsg() throws InterruptedException {
         //given
         assertThat(handler.deviceSessionCtx.isConnected(), is(false));
         assertThat(MSG_QUEUE_LIMIT, greaterThan(2));