user32/tests: Test DisplayConfigGetDeviceInfo() GET_SOURCE_NAME with valid ID and invalid LUID.

dlls/user32/tests/monitor.c

@@ -1309,6 +1309,15 @@ static void test_QueryDisplayConfig_result(UINT32 flags,
         ok(!ret, "Expected 0, got %d\n", ret);
         ok(source_name.viewGdiDeviceName[0] != '\0', "Expected GDI device name, got empty string\n");
 
+        /* Test with an invalid adapter LUID */
+        source_name.header.type = DISPLAYCONFIG_DEVICE_INFO_GET_SOURCE_NAME;
+        source_name.header.size = sizeof(source_name);
+        source_name.header.adapterId.LowPart = 0xFFFF;
+        source_name.header.adapterId.HighPart = 0xFFFF;
+        source_name.header.id = pi[i].sourceInfo.id;
+        ret = pDisplayConfigGetDeviceInfo(&source_name.header);
+        ok(ret == ERROR_GEN_FAILURE, "Expected GEN_FAILURE, got %d\n", ret);
+
         todo_wine {
         target_name.header.type = DISPLAYCONFIG_DEVICE_INFO_GET_TARGET_NAME;
         target_name.header.size = sizeof(target_name);