Add a function to stop KAuth helper daemon.

src/backend/corebackendmanager.cpp

@@ -79,7 +79,13 @@ void CoreBackendManager::startExternalCommandHelper()
     auto conn = QObject::connect(job(), &KAuth::ExecuteJob::newData, exitLoop);
     loop.exec();
     QObject::disconnect(conn);
+}
 
+void CoreBackendManager::stopExternalCommandHelper()
+{
+    QDBusInterface iface(QStringLiteral("org.kde.kpmcore.helperinterface"), QStringLiteral("/Helper"), QStringLiteral("org.kde.kpmcore.externalcommand"), QDBusConnection::systemBus());
+    if (iface.isValid())
+        iface.call(QStringLiteral("exit"), CoreBackendManager::self()->Uuid());
 }
 
 KAuth::ExecuteJob* CoreBackendManager::job() {

src/backend/corebackendmanager.h

@@ -100,6 +100,11 @@ public:
       */
     KAuth::ExecuteJob* job();
 
+    /**
+      * stop ExternalCommand Helper
+      */
+    static void stopExternalCommandHelper();
+
 private:
     void startExternalCommandHelper();
 

test/helpers.cpp

@@ -56,3 +56,8 @@ KPMCoreInitializer::KPMCoreInitializer( const QString& backendName ) :
 KPMCoreInitializer::KPMCoreInitializer( const char* backend ) : KPMCoreInitializer( QString::fromLatin1( backend ) )
 {
 }
+
+KPMCoreInitializer::~KPMCoreInitializer()
+{
+    CoreBackendManager::stopExternalCommandHelper();
+}

test/helpers.h

@@ -32,6 +32,7 @@ public:
     KPMCoreInitializer(); /// Default backend
     KPMCoreInitializer( const QString& backend );  /// Use named backend
     KPMCoreInitializer( const char* backend );  /// Use named backend
+    ~KPMCoreInitializer();
 
     bool isValid() const
     {