diff --git a/src/tests/kernel/core/disk_device_manager/DiskDeviceManagerTest.cpp b/src/tests/kernel/core/disk_device_manager/DiskDeviceManagerTest.cpp
index 809917be0b..f0976cbfbc 100644
--- a/src/tests/kernel/core/disk_device_manager/DiskDeviceManagerTest.cpp
+++ b/src/tests/kernel/core/disk_device_manager/DiskDeviceManagerTest.cpp
@@ -8,6 +8,7 @@
 
 #include <OS.h>
 
+#include <KDiskDevice.h>
 #include <KDiskDeviceManager.h>
 
 // main
@@ -17,6 +18,16 @@ main()
 	KDiskDeviceManager::CreateDefault();
 	KDiskDeviceManager *manager = KDiskDeviceManager::Default();
 	manager->InitialDeviceScan();
+	status_t error = manager->CreateFileDevice("/tmp/test-file-device");
+	if (error != B_OK)
+		printf("creating the file device failed: %s\n", strerror(error));
+	if (manager->Lock()) {
+		for (int32 i = 0; KDiskDevice *device = manager->DeviceAt(i); i++) {
+			device->Dump();
+			printf("\n");
+		}
+		manager->Unlock();
+	}
 	KDiskDeviceManager::DeleteDefault();
 	return 0;
 }