lib.rs

			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."
			);
		})
	}
}