Remark storage (#10698)

* Remark storage

* Fixed benches

* Update frame/remark/src/lib.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Fixed build

* Fixed build

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

substrate/frame/remark/src/tests.rs

@@ -0,0 +1,55 @@
+// This file is part of Substrate.
+
+// Copyright (C) 2019-2022 Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Tests for remarks pallet.
+
+use super::{Error, Event, Pallet as Remark};
+use crate::mock::*;
+use frame_support::{assert_noop, assert_ok};
+use frame_system::RawOrigin;
+
+#[test]
+fn generates_event() {
+	new_test_ext().execute_with(|| {
+		let caller = 1;
+		let data = vec![0u8; 100];
+		System::set_block_number(System::block_number() + 1); //otherwise event won't be registered.
+		assert_ok!(Remark::<Test>::store(RawOrigin::Signed(caller.clone()).into(), data.clone(),));
+		let events = System::events();
+		let system_event: <Test as frame_system::Config>::Event = Event::Stored {
+			content_hash: sp_io::hashing::blake2_256(&data).into(),
+			sender: caller,
+		}
+		.into();
+		let frame_system::EventRecord { event, .. } = &events[events.len() - 1];
+		assert_eq!(event, &system_event);
+	});
+}
+
+#[test]
+fn does_not_store_empty() {
+	new_test_ext().execute_with(|| {
+		let caller = 1;
+		let data = vec![];
+		System::set_block_number(System::block_number() + 1); //otherwise event won't be registered.
+		assert_noop!(
+			Remark::<Test>::store(RawOrigin::Signed(caller.clone()).into(), data.clone(),),
+			Error::<Test>::Empty
+		);
+		assert!(System::events().is_empty());
+	});
+}