Test xcm message export is disabled (#817)

* Test xcm message export is disabled

* Add missing copyright

* Fix clippy

* Add test to check validate fail

chains/orchestrator-relays/runtime/dancelight/src/tests/common/xcm/mod.rs

@@ -17,4 +17,5 @@
 mod constants;
 mod mocknets;
 mod reserver_transfers_polkadot_xcm;
+mod xcm_message_exporter;
 pub use xcm_emulator::{bx, TestExt};

chains/orchestrator-relays/runtime/dancelight/src/tests/common/xcm/xcm_message_exporter.rs

@@ -0,0 +1,75 @@
+// Copyright (C) Moondance Labs Ltd.
+// This file is part of Tanssi.
+
+// Tanssi is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Tanssi is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Tanssi.  If not, see <http://www.gnu.org/licenses/>
+
+use {
+    super::{
+        super::{AccountId, ExtBuilder, ALICE},
+        mocknets::{DancelightRelay as Dancelight, DancelightRelayPallet},
+    },
+    crate::xcm_config,
+    frame_support::{assert_err, weights::Weight},
+    pallet_xcm::Error,
+    sp_runtime::DispatchError,
+    xcm::{latest::prelude::*, v4::Location, VersionedXcm},
+    xcm_emulator::Chain,
+};
+
+#[test]
+fn test_message_exporter_disabled_for_origin_account() {
+    ExtBuilder::default().build().execute_with(|| {
+        // The only test we can do is with signed runtime origins since we are ensuring local origin in xcm config
+        let origin = <Dancelight as Chain>::RuntimeOrigin::signed(AccountId::from(ALICE));
+
+        let message = Xcm(vec![Instruction::ExportMessage {
+            network: NetworkId::Ethereum { chain_id: 1 },
+            destination: Junctions::Here,
+            xcm: Xcm(vec![]),
+        }]);
+
+        assert_eq!(
+            <Dancelight as DancelightRelayPallet>::XcmPallet::execute(
+                origin,
+                Box::new(VersionedXcm::V4(message)),
+                Weight::from_parts(0, 0)
+            )
+            .unwrap_err()
+            .error,
+            DispatchError::from(Error::<<Dancelight as Chain>::Runtime>::LocalExecutionIncomplete)
+        );
+    });
+}
+
+#[test]
+fn test_message_exporter_validate_should_fail() {
+    let mut location = Some(Location {
+        parents: 1,
+        interior: Junctions::Here,
+    });
+
+    let mut message = Some(Xcm(vec![Instruction::ExportMessage {
+        network: NetworkId::Ethereum { chain_id: 1 },
+        destination: Junctions::Here,
+        xcm: Xcm(vec![]),
+    }]));
+
+    assert_err!(
+        <xcm_config::XcmConfig as xcm_executor::Config>::MessageExporter::validate(
+            &mut location,
+            &mut message
+        ),
+        SendError::NotApplicable
+    );
+}