test/binding: inherit Device from Handle
diff --git a/tests/image_tests.cpp b/tests/image_tests.cpp
index dd60907..6193dca 100644
--- a/tests/image_tests.cpp
+++ b/tests/image_tests.cpp
@@ -73,7 +73,7 @@
     void CreateImageView(VkImageViewCreateInfo* pCreateInfo,
                          VkImageView* pView);
     void DestroyImageView(VkImageView imageView);
-    VkDevice device() {return m_device->obj();}
+    VkDevice device() {return m_device->handle();}
 
 protected:
     vk_testing::Device *m_device;