Index: unittests/tst_messaging.cpp
===================================================================
diff -u -r14c541d2b780b0a244bc84860aa565cf8dd7fe4b -rdf0c8b4fa51d4f5ef0216eb2c3f6f5dfc97bf12e
--- unittests/tst_messaging.cpp	(.../tst_messaging.cpp)	(revision 14c541d2b780b0a244bc84860aa565cf8dd7fe4b)
+++ unittests/tst_messaging.cpp	(.../tst_messaging.cpp)	(revision df0c8b4fa51d4f5ef0216eb2c3f6f5dfc97bf12e)
@@ -765,6 +765,20 @@
     QVERIFY(payload.isEmpty());
 }
 
+/*!
+ * \brief   tst_messaging::tst_MessageInterpreter_interpretMessage_AdjustHeparinReq
+ * \details Tests MessageInterpreter interpretMessage to handle ID_AdjustHeparinReq message type
+ *          if data is empty (count==0)
+ */
+void tst_messaging::tst_MessageInterpreter_interpretMessage_AdjustHeparinReq()
+{
+    Can::MessageInterpreter iMsg;
+    QByteArray payload;
+    // if the payload is empty the len is not valid and should return false and empty payload
+    QVERIFY( ! iMsg.interpretMessage(Gui::GuiActionType::ID_AdjustHeparinReq, {}, payload));
+    QVERIFY(payload.isEmpty());
+}
+
 void tst_messaging::tst_MessageInterpreter_interpretMessage_AdjustPressuresReq()
 {
     Can::MessageInterpreter iMsg;