// 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.

#[cfg(test)]
// Do not complain about unused `dispatch` and `dispatch_aux`.
#[allow(dead_code)]
mod tests {
	use frame_support::metadata::*;
	use sp_io::TestExternalities;

	frame_support::decl_module! {
		pub struct Module<T: Config> for enum Call where origin: T::RuntimeOrigin, system=frame_support_test {}
	}

	pub trait Config: frame_support_test::Config {
		type Origin2: codec::Codec
			+ codec::EncodeLike
			+ Default
			+ codec::MaxEncodedLen
			+ scale_info::TypeInfo;
	}

	frame_support::decl_storage! {
		generate_storage_info
		trait Store for Module<T: Config> as TestStorage {
			// non-getters: pub / $default

			/// Hello, this is doc!
			U32: Option<u32>;
			pub PUBU32: Option<u32>;
			U32MYDEF: Option<u32>;
			pub PUBU32MYDEF: Option<u32>;

			// getters: pub / $default
			// we need at least one type which uses T, otherwise GenesisConfig will complain.
			GETU32 get(fn u32_getter): T::Origin2;
			pub PUBGETU32 get(fn pub_u32_getter): u32;
			GETU32WITHCONFIG get(fn u32_getter_with_config) config(): u32;
			pub PUBGETU32WITHCONFIG get(fn pub_u32_getter_with_config) config(): u32;
			GETU32MYDEF get(fn u32_getter_mydef): Option<u32>;
			pub PUBGETU32MYDEF get(fn pub_u32_getter_mydef) config(): u32 = 3;
			GETU32WITHCONFIGMYDEF get(fn u32_getter_with_config_mydef) config(): u32 = 2;
			pub PUBGETU32WITHCONFIGMYDEF get(fn pub_u32_getter_with_config_mydef) config(): u32 = 1;
			PUBGETU32WITHCONFIGMYDEFOPT get(fn pub_u32_getter_with_config_mydef_opt) config(): Option<u32>;

			GetU32WithBuilder get(fn u32_with_builder) build(|_| 1): u32;
			GetOptU32WithBuilderSome get(fn opt_u32_with_builder_some) build(|_| Some(1)): Option<u32>;
			GetOptU32WithBuilderNone get(fn opt_u32_with_builder_none) build(|_| None): Option<u32>;

			// map non-getters: pub / $default
			MAPU32 max_values(3): map hasher(blake2_128_concat) u32 => Option<[u8; 4]>;
			pub PUBMAPU32: map hasher(blake2_128_concat) u32 => Option<[u8; 4]>;

			// map getters: pub / $default
			GETMAPU32 get(fn map_u32_getter): map hasher(blake2_128_concat) u32 => [u8; 4];
			pub PUBGETMAPU32 get(fn pub_map_u32_getter): map hasher(blake2_128_concat) u32 => [u8; 4];
			GETMAPU32MYDEF get(fn map_u32_getter_mydef):
				map hasher(blake2_128_concat) u32 => [u8; 4] = *b"mapd";
			pub PUBGETMAPU32MYDEF get(fn pub_map_u32_getter_mydef):
				map hasher(blake2_128_concat) u32 => [u8; 4] = *b"pubm";

			DOUBLEMAP max_values(3): double_map
				hasher(blake2_128_concat) u32, hasher(blake2_128_concat) u32 => Option<[u8; 4]>;

			DOUBLEMAP2: double_map
				hasher(blake2_128_concat) u32, hasher(blake2_128_concat) u32 => Option<[u8; 4]>;

			COMPLEXTYPE1: (::std::option::Option<T::Origin2>,);
			COMPLEXTYPE2: ([[(u16, Option<()>); 32]; 12], u32);
			COMPLEXTYPE3: [u32; 25];

			NMAP: nmap hasher(blake2_128_concat) u32, hasher(twox_64_concat) u16 => u8;
			NMAP2: nmap hasher(blake2_128_concat) u32 => u8;
		}
		add_extra_genesis {
			build(|_| {});
		}
	}

	struct TraitImpl {}

	impl frame_support_test::Config for TraitImpl {
		type RuntimeOrigin = u32;
		type BlockNumber = u32;
		type PalletInfo = frame_support_test::PanicPalletInfo;
		type DbWeight = ();
	}

	impl Config for TraitImpl {
		type Origin2 = u32;
	}

	fn expected_metadata() -> PalletStorageMetadata {
		PalletStorageMetadata {
			prefix: "TestStorage",
			entries: vec![
				StorageEntryMetadata {
					name: "U32",
					modifier: StorageEntryModifier::Optional,
					ty: StorageEntryType::Plain(scale_info::meta_type::<u32>()),
					default: vec![0],
					docs: vec![" Hello, this is doc!"],
				},
				StorageEntryMetadata {
					name: "PUBU32",
					modifier: StorageEntryModifier::Optional,
					ty: StorageEntryType::Plain(scale_info::meta_type::<u32>()),
					default: vec![0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "U32MYDEF",
					modifier: StorageEntryModifier::Optional,
					ty: StorageEntryType::Plain(scale_info::meta_type::<u32>()),
					default: vec![0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "PUBU32MYDEF",
					modifier: StorageEntryModifier::Optional,
					ty: StorageEntryType::Plain(scale_info::meta_type::<u32>()),
					default: vec![0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "GETU32",
					modifier: StorageEntryModifier::Default,
					ty: StorageEntryType::Plain(scale_info::meta_type::<u32>()),
					default: vec![0, 0, 0, 0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "PUBGETU32",
					modifier: StorageEntryModifier::Default,
					ty: StorageEntryType::Plain(scale_info::meta_type::<u32>()),
					default: vec![0, 0, 0, 0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "GETU32WITHCONFIG",
					modifier: StorageEntryModifier::Default,
					ty: StorageEntryType::Plain(scale_info::meta_type::<u32>()),
					default: vec![0, 0, 0, 0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "PUBGETU32WITHCONFIG",
					modifier: StorageEntryModifier::Default,
					ty: StorageEntryType::Plain(scale_info::meta_type::<u32>()),
					default: vec![0, 0, 0, 0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "GETU32MYDEF",
					modifier: StorageEntryModifier::Optional,
					ty: StorageEntryType::Plain(scale_info::meta_type::<u32>()),
					default: vec![0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "PUBGETU32MYDEF",
					modifier: StorageEntryModifier::Default,
					ty: StorageEntryType::Plain(scale_info::meta_type::<u32>()),
					default: vec![3, 0, 0, 0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "GETU32WITHCONFIGMYDEF",
					modifier: StorageEntryModifier::Default,
					ty: StorageEntryType::Plain(scale_info::meta_type::<u32>()),
					default: vec![2, 0, 0, 0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "PUBGETU32WITHCONFIGMYDEF",
					modifier: StorageEntryModifier::Default,
					ty: StorageEntryType::Plain(scale_info::meta_type::<u32>()),
					default: vec![1, 0, 0, 0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "PUBGETU32WITHCONFIGMYDEFOPT",
					modifier: StorageEntryModifier::Optional,
					ty: StorageEntryType::Plain(scale_info::meta_type::<u32>()),
					default: vec![0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "GetU32WithBuilder",
					modifier: StorageEntryModifier::Default,
					ty: StorageEntryType::Plain(scale_info::meta_type::<u32>()),
					default: vec![0, 0, 0, 0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "GetOptU32WithBuilderSome",
					modifier: StorageEntryModifier::Optional,
					ty: StorageEntryType::Plain(scale_info::meta_type::<u32>()),
					default: vec![0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "GetOptU32WithBuilderNone",
					modifier: StorageEntryModifier::Optional,
					ty: StorageEntryType::Plain(scale_info::meta_type::<u32>()),
					default: vec![0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "MAPU32",
					modifier: StorageEntryModifier::Optional,
					ty: StorageEntryType::Map {
						hashers: vec![StorageHasher::Blake2_128Concat],
						key: scale_info::meta_type::<u32>(),
						value: scale_info::meta_type::<[u8; 4]>(),
					},
					default: vec![0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "PUBMAPU32",
					modifier: StorageEntryModifier::Optional,
					ty: StorageEntryType::Map {
						hashers: vec![StorageHasher::Blake2_128Concat],
						key: scale_info::meta_type::<u32>(),
						value: scale_info::meta_type::<[u8; 4]>(),
					},
					default: vec![0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "GETMAPU32",
					modifier: StorageEntryModifier::Default,
					ty: StorageEntryType::Map {
						hashers: vec![StorageHasher::Blake2_128Concat],
						key: scale_info::meta_type::<u32>(),
						value: scale_info::meta_type::<[u8; 4]>(),
					},
					default: vec![0, 0, 0, 0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "PUBGETMAPU32",
					modifier: StorageEntryModifier::Default,
					ty: StorageEntryType::Map {
						hashers: vec![StorageHasher::Blake2_128Concat],
						key: scale_info::meta_type::<u32>(),
						value: scale_info::meta_type::<[u8; 4]>(),
					},
					default: vec![0, 0, 0, 0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "GETMAPU32MYDEF",
					modifier: StorageEntryModifier::Default,
					ty: StorageEntryType::Map {
						hashers: vec![StorageHasher::Blake2_128Concat],
						key: scale_info::meta_type::<u32>(),
						value: scale_info::meta_type::<[u8; 4]>(),
					},
					default: vec![109, 97, 112, 100], // "map"
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "PUBGETMAPU32MYDEF",
					modifier: StorageEntryModifier::Default,
					ty: StorageEntryType::Map {
						hashers: vec![StorageHasher::Blake2_128Concat],
						key: scale_info::meta_type::<u32>(),
						value: scale_info::meta_type::<[u8; 4]>(),
					},
					default: vec![112, 117, 98, 109], // "pubmap"
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "DOUBLEMAP",
					modifier: StorageEntryModifier::Optional,
					ty: StorageEntryType::Map {
						hashers: vec![
							StorageHasher::Blake2_128Concat,
							StorageHasher::Blake2_128Concat,
						],
						key: scale_info::meta_type::<(u32, u32)>(),
						value: scale_info::meta_type::<[u8; 4]>(),
					},
					default: vec![0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "DOUBLEMAP2",
					modifier: StorageEntryModifier::Optional,
					ty: StorageEntryType::Map {
						hashers: vec![
							StorageHasher::Blake2_128Concat,
							StorageHasher::Blake2_128Concat,
						],
						key: scale_info::meta_type::<(u32, u32)>(),
						value: scale_info::meta_type::<[u8; 4]>(),
					},
					default: vec![0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "COMPLEXTYPE1",
					modifier: StorageEntryModifier::Default,
					ty: StorageEntryType::Plain(scale_info::meta_type::<(Option<u32>,)>()),
					default: vec![0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "COMPLEXTYPE2",
					modifier: StorageEntryModifier::Default,
					ty: StorageEntryType::Plain(scale_info::meta_type::<(
						[[(u16, Option<()>); 32]; 12],
						u32,
					)>()),
					default: [0u8; 1156].to_vec(),
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "COMPLEXTYPE3",
					modifier: StorageEntryModifier::Default,
					ty: StorageEntryType::Plain(scale_info::meta_type::<[u32; 25]>()),
					default: [0u8; 100].to_vec(),
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "NMAP",
					modifier: StorageEntryModifier::Default,
					ty: StorageEntryType::Map {
						key: scale_info::meta_type::<(u32, u16)>(),
						hashers: vec![StorageHasher::Blake2_128Concat, StorageHasher::Twox64Concat],
						value: scale_info::meta_type::<u8>(),
					},
					default: vec![0],
					docs: vec![],
				},
				StorageEntryMetadata {
					name: "NMAP2",
					modifier: StorageEntryModifier::Default,
					ty: StorageEntryType::Map {
						key: scale_info::meta_type::<u32>(),
						hashers: vec![StorageHasher::Blake2_128Concat],
						value: scale_info::meta_type::<u8>(),
					},
					default: vec![0],
					docs: vec![],
				},
			],
		}
	}

	#[test]
	fn storage_info() {
		use frame_support::{
			storage::storage_prefix as prefix,
			traits::{StorageInfo, StorageInfoTrait},
		};

		pretty_assertions::assert_eq!(
			<Module<TraitImpl>>::storage_info(),
			vec![
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"U32".to_vec(),
					prefix: prefix(b"TestStorage", b"U32").to_vec(),
					max_values: Some(1),
					max_size: Some(4),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"PUBU32".to_vec(),
					prefix: prefix(b"TestStorage", b"PUBU32").to_vec(),
					max_values: Some(1),
					max_size: Some(4),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"U32MYDEF".to_vec(),
					prefix: prefix(b"TestStorage", b"U32MYDEF").to_vec(),
					max_values: Some(1),
					max_size: Some(4),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"PUBU32MYDEF".to_vec(),
					prefix: prefix(b"TestStorage", b"PUBU32MYDEF").to_vec(),
					max_values: Some(1),
					max_size: Some(4),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"GETU32".to_vec(),
					prefix: prefix(b"TestStorage", b"GETU32").to_vec(),
					max_values: Some(1),
					max_size: Some(4),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"PUBGETU32".to_vec(),
					prefix: prefix(b"TestStorage", b"PUBGETU32").to_vec(),
					max_values: Some(1),
					max_size: Some(4),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"GETU32WITHCONFIG".to_vec(),
					prefix: prefix(b"TestStorage", b"GETU32WITHCONFIG").to_vec(),
					max_values: Some(1),
					max_size: Some(4),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"PUBGETU32WITHCONFIG".to_vec(),
					prefix: prefix(b"TestStorage", b"PUBGETU32WITHCONFIG").to_vec(),
					max_values: Some(1),
					max_size: Some(4),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"GETU32MYDEF".to_vec(),
					prefix: prefix(b"TestStorage", b"GETU32MYDEF").to_vec(),
					max_values: Some(1),
					max_size: Some(4),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"PUBGETU32MYDEF".to_vec(),
					prefix: prefix(b"TestStorage", b"PUBGETU32MYDEF").to_vec(),
					max_values: Some(1),
					max_size: Some(4),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"GETU32WITHCONFIGMYDEF".to_vec(),
					prefix: prefix(b"TestStorage", b"GETU32WITHCONFIGMYDEF").to_vec(),
					max_values: Some(1),
					max_size: Some(4),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"PUBGETU32WITHCONFIGMYDEF".to_vec(),
					prefix: prefix(b"TestStorage", b"PUBGETU32WITHCONFIGMYDEF").to_vec(),
					max_values: Some(1),
					max_size: Some(4),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"PUBGETU32WITHCONFIGMYDEFOPT".to_vec(),
					prefix: prefix(b"TestStorage", b"PUBGETU32WITHCONFIGMYDEFOPT").to_vec(),
					max_values: Some(1),
					max_size: Some(4),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"GetU32WithBuilder".to_vec(),
					prefix: prefix(b"TestStorage", b"GetU32WithBuilder").to_vec(),
					max_values: Some(1),
					max_size: Some(4),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"GetOptU32WithBuilderSome".to_vec(),
					prefix: prefix(b"TestStorage", b"GetOptU32WithBuilderSome").to_vec(),
					max_values: Some(1),
					max_size: Some(4),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"GetOptU32WithBuilderNone".to_vec(),
					prefix: prefix(b"TestStorage", b"GetOptU32WithBuilderNone").to_vec(),
					max_values: Some(1),
					max_size: Some(4),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"MAPU32".to_vec(),
					prefix: prefix(b"TestStorage", b"MAPU32").to_vec(),
					max_values: Some(3),
					max_size: Some(8 + 16),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"PUBMAPU32".to_vec(),
					prefix: prefix(b"TestStorage", b"PUBMAPU32").to_vec(),
					max_values: None,
					max_size: Some(8 + 16),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"GETMAPU32".to_vec(),
					prefix: prefix(b"TestStorage", b"GETMAPU32").to_vec(),
					max_values: None,
					max_size: Some(8 + 16),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"PUBGETMAPU32".to_vec(),
					prefix: prefix(b"TestStorage", b"PUBGETMAPU32").to_vec(),
					max_values: None,
					max_size: Some(8 + 16),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"GETMAPU32MYDEF".to_vec(),
					prefix: prefix(b"TestStorage", b"GETMAPU32MYDEF").to_vec(),
					max_values: None,
					max_size: Some(8 + 16),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"PUBGETMAPU32MYDEF".to_vec(),
					prefix: prefix(b"TestStorage", b"PUBGETMAPU32MYDEF").to_vec(),
					max_values: None,
					max_size: Some(8 + 16),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"DOUBLEMAP".to_vec(),
					prefix: prefix(b"TestStorage", b"DOUBLEMAP").to_vec(),
					max_values: Some(3),
					max_size: Some(12 + 16 + 16),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"DOUBLEMAP2".to_vec(),
					prefix: prefix(b"TestStorage", b"DOUBLEMAP2").to_vec(),
					max_values: None,
					max_size: Some(12 + 16 + 16),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"COMPLEXTYPE1".to_vec(),
					prefix: prefix(b"TestStorage", b"COMPLEXTYPE1").to_vec(),
					max_values: Some(1),
					max_size: Some(5),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"COMPLEXTYPE2".to_vec(),
					prefix: prefix(b"TestStorage", b"COMPLEXTYPE2").to_vec(),
					max_values: Some(1),
					max_size: Some(1156),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"COMPLEXTYPE3".to_vec(),
					prefix: prefix(b"TestStorage", b"COMPLEXTYPE3").to_vec(),
					max_values: Some(1),
					max_size: Some(100),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"NMAP".to_vec(),
					prefix: prefix(b"TestStorage", b"NMAP").to_vec(),
					max_values: None,
					max_size: Some(16 + 4 + 8 + 2 + 1),
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"NMAP2".to_vec(),
					prefix: prefix(b"TestStorage", b"NMAP2").to_vec(),
					max_values: None,
					max_size: Some(16 + 4 + 1),
				},
			],
		);
	}

	#[test]
	fn store_metadata() {
		let metadata = Module::<TraitImpl>::storage_metadata();
		pretty_assertions::assert_eq!(expected_metadata(), metadata);
	}

	#[test]
	fn check_genesis_config() {
		let config = GenesisConfig::default();
		assert_eq!(config.u32_getter_with_config, 0u32);
		assert_eq!(config.pub_u32_getter_with_config, 0u32);

		assert_eq!(config.pub_u32_getter_mydef, 3u32);
		assert_eq!(config.u32_getter_with_config_mydef, 2u32);
		assert_eq!(config.pub_u32_getter_with_config_mydef, 1u32);
		assert_eq!(config.pub_u32_getter_with_config_mydef_opt, 0u32);
	}

	#[test]
	fn check_builder_config() {
		let config = GenesisConfig::default();
		let storage = config.build_storage().unwrap();
		TestExternalities::from(storage).execute_with(|| {
			assert_eq!(Module::<TraitImpl>::u32_with_builder(), 1);
			assert_eq!(Module::<TraitImpl>::opt_u32_with_builder_some(), Some(1));
			assert_eq!(Module::<TraitImpl>::opt_u32_with_builder_none(), None);
		})
	}
}

#[cfg(test)]
#[allow(dead_code)]
mod test2 {
	pub trait Config: frame_support_test::Config {}

	frame_support::decl_module! {
		pub struct Module<T: Config> for enum Call where origin: T::RuntimeOrigin, system=frame_support_test {}
	}

	type PairOf<T> = (T, T);

	frame_support::decl_storage! {
		trait Store for Module<T: Config> as TestStorage {
			SingleDef : u32;
			PairDef : PairOf<u32>;
			Single : Option<u32>;
			Pair : (u32, u32);
		}
		add_extra_genesis {
			config(_marker) : ::std::marker::PhantomData<T>;
			config(extra_field) : u32 = 32;
			build(|_| {});
		}
	}

	struct TraitImpl {}

	impl frame_support_test::Config for TraitImpl {
		type RuntimeOrigin = u32;
		type BlockNumber = u32;
		type PalletInfo = frame_support_test::PanicPalletInfo;
		type DbWeight = ();
	}

	impl Config for TraitImpl {}

	#[test]
	fn storage_info() {
		use frame_support::{
			storage::storage_prefix as prefix,
			traits::{StorageInfo, StorageInfoTrait},
		};
		pretty_assertions::assert_eq!(
			<Module<TraitImpl>>::storage_info(),
			vec![
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"SingleDef".to_vec(),
					prefix: prefix(b"TestStorage", b"SingleDef").to_vec(),
					max_values: Some(1),
					max_size: None,
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"PairDef".to_vec(),
					prefix: prefix(b"TestStorage", b"PairDef").to_vec(),
					max_values: Some(1),
					max_size: None,
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"Single".to_vec(),
					prefix: prefix(b"TestStorage", b"Single").to_vec(),
					max_values: Some(1),
					max_size: None,
				},
				StorageInfo {
					pallet_name: b"TestStorage".to_vec(),
					storage_name: b"Pair".to_vec(),
					prefix: prefix(b"TestStorage", b"Pair").to_vec(),
					max_values: Some(1),
					max_size: None,
				},
			],
		);
	}
}

#[cfg(test)]
#[allow(dead_code)]
mod test3 {
	pub trait Config: frame_support_test::Config {}

	frame_support::decl_module! {
		pub struct Module<T: Config> for enum Call where origin: T::RuntimeOrigin, system=frame_support_test {}
	}
	frame_support::decl_storage! {
		trait Store for Module<T: Config> as Test {
			Foo get(fn foo) config(initial_foo): u32;
		}
	}

	type PairOf<T> = (T, T);

	struct TraitImpl {}

	impl frame_support_test::Config for TraitImpl {
		type RuntimeOrigin = u32;
		type BlockNumber = u32;
		type PalletInfo = frame_support_test::PanicPalletInfo;
		type DbWeight = ();
	}

	impl Config for TraitImpl {}
}

#[cfg(test)]
#[allow(dead_code)]
mod test_append_and_len {
	use codec::{Decode, Encode};
	use sp_io::TestExternalities;

	pub trait Config: frame_support_test::Config {}

	frame_support::decl_module! {
		pub struct Module<T: Config> for enum Call where origin: T::RuntimeOrigin, system=frame_support_test {}
	}

	#[derive(PartialEq, Eq, Clone, Encode, Decode, scale_info::TypeInfo)]
	struct NoDef(u32);

	frame_support::decl_storage! {
		trait Store for Module<T: Config> as Test {
			NoDefault: Option<NoDef>;

			JustVec: Vec<u32>;
			JustVecWithDefault: Vec<u32> = vec![6, 9];
			OptionVec: Option<Vec<u32>>;

			MapVec: map hasher(blake2_128_concat) u32 => Vec<u32>;
			MapVecWithDefault: map hasher(blake2_128_concat) u32 => Vec<u32> = vec![6, 9];
			OptionMapVec: map hasher(blake2_128_concat) u32 => Option<Vec<u32>>;

			DoubleMapVec: double_map hasher(blake2_128_concat) u32, hasher(blake2_128_concat) u32 => Vec<u32>;
			DoubleMapVecWithDefault: double_map hasher(blake2_128_concat) u32, hasher(blake2_128_concat) u32 => Vec<u32> = vec![6, 9];
			OptionDoubleMapVec: double_map hasher(blake2_128_concat) u32, hasher(blake2_128_concat) u32 => Option<Vec<u32>>;
		}
	}

	struct Test {}

	impl frame_support_test::Config for Test {
		type RuntimeOrigin = u32;
		type BlockNumber = u32;
		type PalletInfo = frame_support_test::PanicPalletInfo;
		type DbWeight = ();
	}

	impl Config for Test {}

	#[test]
	fn default_for_option() {
		TestExternalities::default().execute_with(|| {
			assert_eq!(OptionVec::get(), None);
			assert!(JustVec::get().is_empty());
		});
	}

	#[test]
	fn append_works() {
		TestExternalities::default().execute_with(|| {
			for val in &[1, 2, 3, 4, 5] {
				MapVec::append(1, val);
			}
			assert_eq!(MapVec::get(1), vec![1, 2, 3, 4, 5]);

			MapVec::remove(1);
			MapVec::append(1, 1);
			assert_eq!(MapVec::get(1), vec![1]);

			for val in &[1, 2, 3, 4, 5] {
				JustVec::append(val);
			}
			assert_eq!(JustVec::get(), vec![1, 2, 3, 4, 5]);

			JustVec::kill();
			JustVec::append(1);
			assert_eq!(JustVec::get(), vec![1]);
		});
	}

	#[test]
	fn append_overwrites_invalid_data() {
		TestExternalities::default().execute_with(|| {
			let key = JustVec::hashed_key();
			// Set it to some invalid value.
			frame_support::storage::unhashed::put_raw(&key, b"1");
			assert!(JustVec::get().is_empty());
			assert_eq!(frame_support::storage::unhashed::get_raw(&key), Some(b"1".to_vec()));

			JustVec::append(1);
			JustVec::append(2);
			assert_eq!(JustVec::get(), vec![1, 2]);
		});
	}

	#[test]
	fn append_overwrites_default() {
		TestExternalities::default().execute_with(|| {
			assert_eq!(JustVecWithDefault::get(), vec![6, 9]);
			JustVecWithDefault::append(1);
			assert_eq!(JustVecWithDefault::get(), vec![1]);

			assert_eq!(MapVecWithDefault::get(0), vec![6, 9]);
			MapVecWithDefault::append(0, 1);
			assert_eq!(MapVecWithDefault::get(0), vec![1]);

			assert_eq!(OptionVec::get(), None);
			OptionVec::append(1);
			assert_eq!(OptionVec::get(), Some(vec![1]));
		});
	}

	#[test]
	fn len_works() {
		TestExternalities::default().execute_with(|| {
			JustVec::put(&vec![1, 2, 3, 4]);
			OptionVec::put(&vec![1, 2, 3, 4, 5]);
			MapVec::insert(1, &vec![1, 2, 3, 4, 5, 6]);
			DoubleMapVec::insert(0, 1, &vec![1, 2]);

			assert_eq!(JustVec::decode_len().unwrap(), 4);
			assert_eq!(OptionVec::decode_len().unwrap(), 5);
			assert_eq!(MapVec::decode_len(1).unwrap(), 6);
			assert_eq!(DoubleMapVec::decode_len(0, 1).unwrap(), 2);
		});
	}

	// `decode_len` should always return `None` for default assigments
	// in `decl_storage!`.
	#[test]
	fn len_works_ignores_default_assignment() {
		TestExternalities::default().execute_with(|| {
			// vec
			assert!(JustVec::get().is_empty());
			assert_eq!(JustVec::decode_len(), None);

			assert_eq!(JustVecWithDefault::get(), vec![6, 9]);
			assert_eq!(JustVecWithDefault::decode_len(), None);

			assert_eq!(OptionVec::get(), None);
			assert_eq!(OptionVec::decode_len(), None);

			// map
			assert!(MapVec::get(0).is_empty());
			assert_eq!(MapVec::decode_len(0), None);

			assert_eq!(MapVecWithDefault::get(0), vec![6, 9]);
			assert_eq!(MapVecWithDefault::decode_len(0), None);

			assert_eq!(OptionMapVec::get(0), None);
			assert_eq!(OptionMapVec::decode_len(0), None);

			// Double map
			assert!(DoubleMapVec::get(0, 0).is_empty());
			assert_eq!(DoubleMapVec::decode_len(0, 1), None);

			assert_eq!(DoubleMapVecWithDefault::get(0, 0), vec![6, 9]);
			assert_eq!(DoubleMapVecWithDefault::decode_len(0, 1), None);

			assert_eq!(OptionDoubleMapVec::get(0, 0), None);
			assert_eq!(OptionDoubleMapVec::decode_len(0, 1), None);
		});
	}
}