lib.rs

			assert_err!(
				Pallet::<TestRuntime>::submit_finality_proof(
					Origin::signed(1),
					Box::new(header),
					justification
				),
				<Error<TestRuntime>>::UnsupportedScheduledChange
			);
		})
	}

	#[test]
	fn parse_finalized_storage_proof_rejects_proof_on_unknown_header() {
		run_test(|| {
			assert_noop!(
				Pallet::<TestRuntime>::parse_finalized_storage_proof(
					Default::default(),
					sp_trie::StorageProof::new(vec![]),
					|_| (),
				),
				Error::<TestRuntime>::UnknownHeader,
			);
		});
	}

	#[test]
	fn parse_finalized_storage_accepts_valid_proof() {
		run_test(|| {
			let (state_root, storage_proof) = bp_runtime::craft_valid_storage_proof();

			let mut header = test_header(2);
			header.set_state_root(state_root);

			let hash = header.hash();
			<BestFinalized<TestRuntime>>::put(hash);
			<ImportedHeaders<TestRuntime>>::insert(hash, header);

			assert_ok!(
				Pallet::<TestRuntime>::parse_finalized_storage_proof(hash, storage_proof, |_| (),),
				(),
			);
		});
	}

	#[test]
	fn rate_limiter_disallows_imports_once_limit_is_hit_in_single_block() {
		run_test(|| {
			initialize_substrate_bridge();

			assert_ok!(submit_finality_proof(1));
			assert_ok!(submit_finality_proof(2));
			assert_err!(submit_finality_proof(3), <Error<TestRuntime>>::TooManyRequests);
		})
	}

	#[test]
	fn rate_limiter_invalid_requests_do_not_count_towards_request_count() {
		run_test(|| {
			let submit_invalid_request = || {
				let header = test_header(1);
				let mut invalid_justification = make_default_justification(&header);
				invalid_justification.round = 42;

				Pallet::<TestRuntime>::submit_finality_proof(
					Origin::signed(1),
					Box::new(header),
					invalid_justification,
				)
			};

			initialize_substrate_bridge();

			for _ in 0..<TestRuntime as Config>::MaxRequests::get() + 1 {
				// Notice that the error here *isn't* `TooManyRequests`
				assert_err!(submit_invalid_request(), <Error<TestRuntime>>::InvalidJustification);
			}

			// Can still submit `MaxRequests` requests afterwards
			assert_ok!(submit_finality_proof(1));
			assert_ok!(submit_finality_proof(2));
			assert_err!(submit_finality_proof(3), <Error<TestRuntime>>::TooManyRequests);
		})
	}

	#[test]
	fn rate_limiter_allows_request_after_new_block_has_started() {
		run_test(|| {
			initialize_substrate_bridge();
			assert_ok!(submit_finality_proof(1));
			assert_ok!(submit_finality_proof(2));

			next_block();
			assert_ok!(submit_finality_proof(3));
		})
	}

	#[test]
	fn rate_limiter_disallows_imports_once_limit_is_hit_across_different_blocks() {
		run_test(|| {
			initialize_substrate_bridge();
			assert_ok!(submit_finality_proof(1));
			assert_ok!(submit_finality_proof(2));

			next_block();
			assert_ok!(submit_finality_proof(3));
			assert_err!(submit_finality_proof(4), <Error<TestRuntime>>::TooManyRequests);
		})
	}

	#[test]
	fn rate_limiter_allows_max_requests_after_long_time_with_no_activity() {
		run_test(|| {
			initialize_substrate_bridge();
			assert_ok!(submit_finality_proof(1));
			assert_ok!(submit_finality_proof(2));

			next_block();
			next_block();

			next_block();
			assert_ok!(submit_finality_proof(5));
			assert_ok!(submit_finality_proof(7));
		})
	}

	#[test]
	fn should_prune_headers_over_headers_to_keep_parameter() {
		run_test(|| {
			initialize_substrate_bridge();
			assert_ok!(submit_finality_proof(1));
			let first_header = Pallet::<TestRuntime>::best_finalized();
			next_block();

			assert_ok!(submit_finality_proof(2));
			next_block();
			assert_ok!(submit_finality_proof(3));
			next_block();
			assert_ok!(submit_finality_proof(4));
			next_block();
			assert_ok!(submit_finality_proof(5));
			next_block();

			assert_ok!(submit_finality_proof(6));

			assert!(
				!Pallet::<TestRuntime>::is_known_header(first_header.hash()),
				"First header should be pruned."
			);
		})
	}

	#[test]
	fn storage_keys_computed_properly() {
		assert_eq!(
			IsHalted::<TestRuntime>::storage_value_final_key().to_vec(),
			bp_header_chain::storage_keys::is_halted_key("Grandpa").0,
		);

		assert_eq!(
			BestFinalized::<TestRuntime>::storage_value_final_key().to_vec(),
			bp_header_chain::storage_keys::best_finalized_hash_key("Grandpa").0,
		);
	}
}