add coins pallet tests (#606)

* add tests

* remove unused crate

* remove serai_abi

substrate/coins/pallet/Cargo.toml

@@ -34,13 +34,17 @@ pallet-transaction-payment = { git = "https://github.com/serai-dex/substrate", d
 serai-primitives = { path = "../../primitives", default-features = false, features = ["serde"] }
 coins-primitives = { package = "serai-coins-primitives", path = "../primitives", default-features = false }
 
+[dev-dependencies]
+sp-io = { git = "https://github.com/serai-dex/substrate", default-features = false }
+
 [features]
 std = [
   "frame-system/std",
   "frame-support/std",
 
   "sp-core/std",
   "sp-std/std",
+  "sp-io/std",
   "sp-runtime/std",
 
   "pallet-transaction-payment/std",
@@ -49,8 +53,12 @@ std = [
   "coins-primitives/std",
 ]
 
-# TODO
-try-runtime = []
+try-runtime = [
+  "frame-system/try-runtime",
+  "frame-support/try-runtime",
+
+  "sp-runtime/try-runtime",
+]
 
 runtime-benchmarks = [
   "frame-system/runtime-benchmarks",

substrate/coins/pallet/src/lib.rs

@@ -1,5 +1,11 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 
+#[cfg(test)]
+mod mock;
+
+#[cfg(test)]
+mod tests;
+
 use serai_primitives::{Balance, Coin, ExternalBalance, SubstrateAmount};
 
 pub trait AllowMint {

substrate/coins/pallet/src/mock.rs

@@ -0,0 +1,70 @@
+//! Test environment for Coins pallet.
+
+use super::*;
+
+use frame_support::{
+  construct_runtime,
+  traits::{ConstU32, ConstU64},
+};
+
+use sp_core::{H256, sr25519::Public};
+use sp_runtime::{
+  traits::{BlakeTwo256, IdentityLookup},
+  BuildStorage,
+};
+
+use crate as coins;
+
+type Block = frame_system::mocking::MockBlock<Test>;
+
+construct_runtime!(
+  pub enum Test
+  {
+    System: frame_system,
+    Coins: coins,
+  }
+);
+
+impl frame_system::Config for Test {
+  type BaseCallFilter = frame_support::traits::Everything;
+  type BlockWeights = ();
+  type BlockLength = ();
+  type RuntimeOrigin = RuntimeOrigin;
+  type RuntimeCall = RuntimeCall;
+  type Nonce = u64;
+  type Hash = H256;
+  type Hashing = BlakeTwo256;
+  type AccountId = Public;
+  type Lookup = IdentityLookup<Self::AccountId>;
+  type Block = Block;
+  type RuntimeEvent = RuntimeEvent;
+  type BlockHashCount = ConstU64<250>;
+  type DbWeight = ();
+  type Version = ();
+  type PalletInfo = PalletInfo;
+  type AccountData = ();
+  type OnNewAccount = ();
+  type OnKilledAccount = ();
+  type SystemWeightInfo = ();
+  type SS58Prefix = ();
+  type OnSetCode = ();
+  type MaxConsumers = ConstU32<16>;
+}
+
+impl Config for Test {
+  type RuntimeEvent = RuntimeEvent;
+
+  type AllowMint = ();
+}
+
+pub(crate) fn new_test_ext() -> sp_io::TestExternalities {
+  let mut t = frame_system::GenesisConfig::<Test>::default().build_storage().unwrap();
+
+  crate::GenesisConfig::<Test> { accounts: vec![], _ignore: Default::default() }
+    .assimilate_storage(&mut t)
+    .unwrap();
+
+  let mut ext = sp_io::TestExternalities::new(t);
+  ext.execute_with(|| System::set_block_number(0));
+  ext
+}

substrate/coins/pallet/src/tests.rs

@@ -0,0 +1,129 @@
+use crate::{mock::*, primitives::*};
+
+use frame_system::RawOrigin;
+use sp_core::Pair;
+
+use serai_primitives::*;
+
+pub type CoinsEvent = crate::Event<Test, ()>;
+
+#[test]
+fn mint() {
+  new_test_ext().execute_with(|| {
+    // minting u64::MAX should work
+    let coin = Coin::Serai;
+    let to = insecure_pair_from_name("random1").public();
+    let balance = Balance { coin, amount: Amount(u64::MAX) };
+
+    Coins::mint(to, balance).unwrap();
+    assert_eq!(Coins::balance(to, coin), balance.amount);
+
+    // minting more should fail
+    assert!(Coins::mint(to, Balance { coin, amount: Amount(1) }).is_err());
+
+    // supply now should be equal to sum of the accounts balance sum
+    assert_eq!(Coins::supply(coin), balance.amount.0);
+
+    // test events
+    let mint_events = System::events()
+      .iter()
+      .filter_map(|event| {
+        if let RuntimeEvent::Coins(e) = &event.event {
+          if matches!(e, CoinsEvent::Mint { .. }) {
+            Some(e.clone())
+          } else {
+            None
+          }
+        } else {
+          None
+        }
+      })
+      .collect::<Vec<_>>();
+
+    assert_eq!(mint_events, vec![CoinsEvent::Mint { to, balance }]);
+  })
+}
+
+#[test]
+fn burn_with_instruction() {
+  new_test_ext().execute_with(|| {
+    // mint some coin
+    let coin = Coin::External(ExternalCoin::Bitcoin);
+    let to = insecure_pair_from_name("random1").public();
+    let balance = Balance { coin, amount: Amount(10 * 10u64.pow(coin.decimals())) };
+
+    Coins::mint(to, balance).unwrap();
+    assert_eq!(Coins::balance(to, coin), balance.amount);
+    assert_eq!(Coins::supply(coin), balance.amount.0);
+
+    // we shouldn't be able to burn more than what we have
+    let mut instruction = OutInstructionWithBalance {
+      instruction: OutInstruction { address: ExternalAddress::new(vec![]).unwrap(), data: None },
+      balance: ExternalBalance {
+        coin: coin.try_into().unwrap(),
+        amount: Amount(balance.amount.0 + 1),
+      },
+    };
+    assert!(
+      Coins::burn_with_instruction(RawOrigin::Signed(to).into(), instruction.clone()).is_err()
+    );
+
+    // it should now work
+    instruction.balance.amount = balance.amount;
+    Coins::burn_with_instruction(RawOrigin::Signed(to).into(), instruction.clone()).unwrap();
+
+    // balance & supply now should be back to 0
+    assert_eq!(Coins::balance(to, coin), Amount(0));
+    assert_eq!(Coins::supply(coin), 0);
+
+    let burn_events = System::events()
+      .iter()
+      .filter_map(|event| {
+        if let RuntimeEvent::Coins(e) = &event.event {
+          if matches!(e, CoinsEvent::BurnWithInstruction { .. }) {
+            Some(e.clone())
+          } else {
+            None
+          }
+        } else {
+          None
+        }
+      })
+      .collect::<Vec<_>>();
+
+    assert_eq!(burn_events, vec![CoinsEvent::BurnWithInstruction { from: to, instruction }]);
+  })
+}
+
+#[test]
+fn transfer() {
+  new_test_ext().execute_with(|| {
+    // mint some coin
+    let coin = Coin::External(ExternalCoin::Bitcoin);
+    let from = insecure_pair_from_name("random1").public();
+    let balance = Balance { coin, amount: Amount(10 * 10u64.pow(coin.decimals())) };
+
+    Coins::mint(from, balance).unwrap();
+    assert_eq!(Coins::balance(from, coin), balance.amount);
+    assert_eq!(Coins::supply(coin), balance.amount.0);
+
+    // we can't send more than what we have
+    let to = insecure_pair_from_name("random2").public();
+    assert!(Coins::transfer(
+      RawOrigin::Signed(from).into(),
+      to,
+      Balance { coin, amount: Amount(balance.amount.0 + 1) }
+    )
+    .is_err());
+
+    // we can send it all
+    Coins::transfer(RawOrigin::Signed(from).into(), to, balance).unwrap();
+
+    // check the balances
+    assert_eq!(Coins::balance(from, coin), Amount(0));
+    assert_eq!(Coins::balance(to, coin), balance.amount);
+
+    // supply shouldn't change
+    assert_eq!(Coins::supply(coin), balance.amount.0);
+  })
+}