tests: Clean up misc validation warnings
diff --git a/tests/vkrenderframework.cpp b/tests/vkrenderframework.cpp
index 5411ff1..61f53b6 100644
--- a/tests/vkrenderframework.cpp
+++ b/tests/vkrenderframework.cpp
@@ -623,6 +623,11 @@
         dst_mask = VK_ACCESS_SHADER_READ_BIT | VK_ACCESS_MEMORY_READ_BIT;
         break;
 
+    case VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL:
+        src_mask = 0;
+        dst_mask = VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;
+        break;
+
     default:
         src_mask = all_cache_outputs;
         dst_mask = all_cache_inputs;