diff --git a/kcm/kcm.h b/kcm/kcm.h
--- a/kcm/kcm.h
+++ b/kcm/kcm.h
@@ -59,7 +59,6 @@
     void load() override;
     void save() override;
     void defaults() override;
-    void test(const QString &plugin);
 
 Q_SIGNALS:
     void wallpaperConfigurationChanged();
diff --git a/kcm/kcm.cpp b/kcm/kcm.cpp
--- a/kcm/kcm.cpp
+++ b/kcm/kcm.cpp
@@ -134,20 +134,6 @@
     updateState();
 }
 
-void ScreenLockerKcm::test(const QString &plugin)
-{
-    if (plugin.isEmpty() || plugin == QLatin1String("none")) {
-        return;
-    }
-
-    QProcess proc;
-    QStringList arguments;
-    arguments << plugin << QStringLiteral("--testing");
-    if (proc.execute(QString::fromLatin1(KSCREENLOCKER_GREET_BIN), arguments)) {
-        QMessageBox::critical(this, i18n("Error"), i18n("Failed to successfully test the screen locker."));
-    }
-}
-
 void ScreenLockerKcm::save()
 {
     KCModule::save();