diff --git a/update.cpp b/update.cpp
index ff85864..8b520cb 100644
--- a/update.cpp
+++ b/update.cpp
@@ -83,6 +83,7 @@ Update::Update(hwinf *hw,
                QString update_ctrl_file,
                QString workingDir,
                bool maintenanceMode,
+               bool testMode,
                QObject *parent,
                char const *serialInterface,
                char const *baudrate)
@@ -94,37 +95,43 @@ Update::Update(hwinf *hw,
     , m_update_ctrl_file_copy(update_ctrl_file + ".copy")
     , m_workingDir(workingDir)
     , m_maintenanceMode(maintenanceMode)
+    , m_testMode(testMode)
     , m_init(true) {
 
-    // make sure the files are empty
-    if (m_update_ctrl_file.exists()) {
-        if (m_update_ctrl_file.open(QIODevice::ReadWrite |
-                                    QIODevice::Truncate |
-                                    QIODevice::Text)) {
-            m_update_ctrl_file.close();
+    if (!m_testMode) {
+        // make sure the files are empty
+        if (m_update_ctrl_file.exists()) {
+            if (m_update_ctrl_file.open(QIODevice::ReadWrite |
+                                        QIODevice::Truncate |
+                                        QIODevice::Text)) {
+                m_update_ctrl_file.close();
+            }
+        } else {
+            qCritical() << "Update-file" << m_update_ctrl_file.fileName()
+                        << "does not exist";
+            m_init = false;
         }
-    } else {
-        qCritical() << "Update-file" << m_update_ctrl_file.fileName()
-                    << "does not exist";
-        m_init = false;
-    }
-    if (m_update_ctrl_file_copy.exists()) {
-        if (m_update_ctrl_file_copy.open(QIODevice::ReadWrite |
-                                         QIODevice::Truncate |
-                                         QIODevice::Text)) {
-            m_update_ctrl_file_copy.close();
+        if (m_update_ctrl_file_copy.exists()) {
+            if (m_update_ctrl_file_copy.open(QIODevice::ReadWrite |
+                                             QIODevice::Truncate |
+                                             QIODevice::Text)) {
+                m_update_ctrl_file_copy.close();
+            }
+        } else {
+            qCritical() << "Update-file-copy" << m_update_ctrl_file_copy.fileName()
+                        << "does not exist";
+            m_init = false;
         }
-    } else {
-        qCritical() << "Update-file-copy" << m_update_ctrl_file_copy.fileName()
-                    << "does not exist";
-        m_init = false;
     }
 
     // execute update_psa-script
     if (m_init) {
-        if ((m_init = execUpdateScript()) == false) {
-            qCritical() << "UPDATE_SCRIPT FAILED";
-        } else {
+        if (!m_testMode) {
+            if ((m_init = execUpdateScript()) == false) {
+                qCritical() << "UPDATE_SCRIPT FAILED";
+            }
+        }
+        if (m_init) {
             if (!m_update_ctrl_file.open(QIODevice::ReadWrite | QIODevice::Text)) {
                 qCritical() << "CAN NOT OPEN" << m_update_ctrl_file.fileName();
                 m_init = false;