Test: display something before the low-cost screensaver activates

The newly added snapshot is not correct because the problem has not yet been fixed.

test/test_instructions.py

@@ -256,9 +256,35 @@ def test_automatic_low_cost_screensaver(firmware: Firmware,
 
     time.sleep(30)
 
-    # Low-cost screensaver desactivate after button push
+    # Low-cost screensaver deactivate after button push
     tezos_navigator.assert_screen("home_screen")
 
+    attestation = build_attestation(
+        op_level=2,
+        op_round=0,
+        chain_id=DEFAULT_CHAIN_ID
+    )
+
+    client.sign_message(account, attestation)
+
+    time.sleep(5)
+
+    # Low-cost screensaver activate after 20s after signing
+    tezos_navigator.assert_screen("home_screen")
+
+    def delayed_authorize_navigate(**kwargs):
+        time.sleep(30)
+
+        # Low-cost screensaver deactivate after something is displayed.
+        tezos_navigator.assert_screen("first_authorize_screen")
+
+        tezos_navigator.accept_key_navigate(**kwargs)
+
+    tezos_navigator.authorize_baking(
+        account,
+        navigate=delayed_authorize_navigate
+    )
+
 
 def test_version(client: TezosClient) -> None:
     """Test the VERSION instruction."""