it: add fifo test

src/it/testrun.rs

@@ -91,6 +91,7 @@ impl TestRun {
             activation: registry.get_activation().await?,
             data_device_manager: registry.get_data_device_manager().await?,
             cursor_shape_manager: registry.get_cursor_shape_manager().await?,
+            fifo_manager: registry.get_fifo_manager().await?,
             registry,
         }))
     }