Added xcmp_queue_send_xcm_works test (#1422)

This PR adds test case for successful `send_xcm` for `XcmpQueue`
according to the opened HRMP channel to the sibling parachain.

cumulus/pallets/xcmp-queue/src/tests.rs

@@ -14,9 +14,9 @@
 // limitations under the License.
 
 use super::*;
-use cumulus_primitives_core::XcmpMessageHandler;
+use cumulus_primitives_core::{ParaId, XcmpMessageHandler};
 use frame_support::{assert_noop, assert_ok};
-use mock::{new_test_ext, RuntimeCall, RuntimeOrigin, Test, XcmpQueue};
+use mock::{new_test_ext, ParachainSystem, RuntimeCall, RuntimeOrigin, Test, XcmpQueue};
 use sp_runtime::traits::BadOrigin;
 
 #[test]
@@ -341,3 +341,32 @@ fn xcmp_queue_consumes_dest_and_msg_on_ok_validate() {
 		);
 	});
 }
+
+#[test]
+fn xcmp_queue_send_xcm_works() {
+	new_test_ext().execute_with(|| {
+		let sibling_para_id = ParaId::from(12345);
+		let dest = (Parent, X1(Parachain(sibling_para_id.into()))).into();
+		let msg = Xcm(vec![ClearOrigin]);
+
+		// try to send without opened HRMP channel to the sibling_para_id
+		assert_eq!(
+			send_xcm::<XcmpQueue>(dest, msg.clone()),
+			Err(SendError::Transport("NoChannel")),
+		);
+
+		// open HRMP channel to the sibling_para_id
+		ParachainSystem::open_outbound_hrmp_channel_for_benchmarks_or_tests(sibling_para_id);
+
+		// check empty outbound queue
+		assert!(XcmpQueue::take_outbound_messages(usize::MAX).is_empty());
+
+		// now send works
+		assert_ok!(send_xcm::<XcmpQueue>(dest, msg));
+
+		// check outbound queue contains message/page for sibling_para_id
+		assert!(XcmpQueue::take_outbound_messages(usize::MAX)
+			.iter()
+			.any(|(para_id, _)| para_id == &sibling_para_id));
+	})
+}