Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: BitHighlander

tests/test_msg_solana_signtx.py

@@ -274,10 +274,10 @@ def test_solana_sign_token_transfer(self):
         raw_tx = self._build_tx(
             from_pubkey, [to_account, from_pubkey], self.TOKEN_PROGRAM, instr_data
         )
-        with pytest.raises(CallException):
-            self.client.call(messages.SolanaSignTx(
-                address_n=parse_path("m/44'/501'/0'/0'"), raw_tx=raw_tx))
-
+with pytest.raises(CallException) as exc:
+    self.client.call(messages.SolanaSignTx(
+        address_n=parse_path("m/44'/501'/0'/0'"), raw_tx=raw_tx))
+self.assertIn("policy", str(exc.value))
     def test_solana_sign_token_approve(self):
         """Unchecked SPL Approve is opaque because no mint is signed."""
         self.requires_fullFeature()