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// Copyright 2019-2025 PureStake Inc.
// This file is part of Moonbeam.
// Moonbeam is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Moonbeam is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Moonbeam. If not, see <http://www.gnu.org/licenses/>.
use crate::mock::{
events, roll_to, roll_to_round_begin, set_points, ExtBuilder, PCall, ParachainStaking,
Precompiles, PrecompilesValue, Runtime, RuntimeCall, RuntimeOrigin,
};
use core::str::from_utf8;
use fp_evm::MAX_TRANSACTION_GAS_LIMIT;
use frame_support::assert_ok;
use frame_support::sp_runtime::Percent;
use pallet_evm::Call as EvmCall;
use pallet_parachain_staking::Event as StakingEvent;
use precompile_utils::{prelude::*, testing::*};
use sp_core::{H160, U256};
use sp_runtime::traits::Dispatchable;
fn precompiles() -> Precompiles<Runtime> {
PrecompilesValue::get()
}
fn evm_call(source: impl Into<H160>, input: Vec<u8>) -> EvmCall<Runtime> {
EvmCall::call {
source: source.into(),
target: Precompile1.into(),
input,
value: U256::zero(), // No value sent in EVM
gas_limit: MAX_TRANSACTION_GAS_LIMIT.low_u64(),
max_fee_per_gas: U256::zero(),
max_priority_fee_per_gas: Some(U256::zero()),
nonce: None, // Use the next nonce
access_list: Vec::new(),
authorization_list: Vec::new(),
#[test]
fn selectors() {
assert!(PCall::is_delegator_selectors().contains(&0xfd8ab482));
assert!(PCall::is_candidate_selectors().contains(&0xd51b9e93));
assert!(PCall::is_selected_candidate_selectors().contains(&0x740d7d2a));
assert!(PCall::delegation_amount_selectors().contains(&0xa73e51bc));
assert!(PCall::is_in_top_delegations_selectors().contains(&0x91cc8657));
assert!(PCall::points_selectors().contains(&0x9799b4e7));
assert!(PCall::min_delegation_selectors().contains(&0x02985992));
assert!(PCall::candidate_count_selectors().contains(&0xa9a981a3));
assert!(PCall::round_selectors().contains(&0x146ca531));
assert!(PCall::candidate_delegation_count_selectors().contains(&0x2ec087eb));
assert!(PCall::candidate_auto_compounding_delegation_count_selectors().contains(&0x905f0806));
assert!(PCall::delegator_delegation_count_selectors().contains(&0x067ec822));
assert!(PCall::selected_candidates_selectors().contains(&0xbcf868a6));
assert!(PCall::delegation_request_is_pending_selectors().contains(&0x3b16def8));
assert!(PCall::candidate_exit_is_pending_selectors().contains(&0x43443682));
assert!(PCall::candidate_request_is_pending_selectors().contains(&0xd0deec11));
assert!(PCall::join_candidates_selectors().contains(&0x1f2f83ad));
assert!(PCall::schedule_leave_candidates_selectors().contains(&0xb1a3c1b7));
assert!(PCall::execute_leave_candidates_selectors().contains(&0x3867f308));
assert!(PCall::cancel_leave_candidates_selectors().contains(&0x9c76ebb4));
assert!(PCall::go_offline_selectors().contains(&0xa6485ccd));
assert!(PCall::go_online_selectors().contains(&0x6e5b676b));
assert!(PCall::candidate_bond_more_selectors().contains(&0xa52c8643));
assert!(PCall::schedule_candidate_bond_less_selectors().contains(&0x60744ae0));
assert!(PCall::execute_candidate_bond_less_selectors().contains(&0x2e290290));
assert!(PCall::cancel_candidate_bond_less_selectors().contains(&0xb5ad5f07));
assert!(PCall::delegate_with_auto_compound_selectors().contains(&0x4b8bc9bf));
assert!(PCall::schedule_revoke_delegation_selectors().contains(&0x1a1c740c));
assert!(PCall::delegator_bond_more_selectors().contains(&0x0465135b));
assert!(PCall::schedule_delegator_bond_less_selectors().contains(&0xc172fd2b));
assert!(PCall::execute_delegation_request_selectors().contains(&0xe98c8abe));
assert!(PCall::cancel_delegation_request_selectors().contains(&0xc90eee83));
assert!(PCall::get_delegator_total_staked_selectors().contains(&0xe6861713));
assert!(PCall::get_candidate_total_counted_selectors().contains(&0xbc5a1043));
fn modifiers() {
ExtBuilder::default().build().execute_with(|| {
let mut tester = PrecompilesModifierTester::new(precompiles(), Alice, Precompile1);
tester.test_view_modifier(PCall::is_delegator_selectors());
tester.test_view_modifier(PCall::is_candidate_selectors());
tester.test_view_modifier(PCall::is_selected_candidate_selectors());
tester.test_view_modifier(PCall::points_selectors());
tester.test_view_modifier(PCall::delegation_amount_selectors());
tester.test_view_modifier(PCall::is_in_top_delegations_selectors());
tester.test_view_modifier(PCall::min_delegation_selectors());
tester.test_view_modifier(PCall::candidate_count_selectors());
tester.test_view_modifier(PCall::round_selectors());
tester.test_view_modifier(PCall::candidate_delegation_count_selectors());
tester.test_view_modifier(PCall::delegator_delegation_count_selectors());
tester.test_view_modifier(PCall::selected_candidates_selectors());
tester.test_view_modifier(PCall::delegation_request_is_pending_selectors());
tester.test_view_modifier(PCall::candidate_exit_is_pending_selectors());
tester.test_view_modifier(PCall::candidate_request_is_pending_selectors());
tester.test_default_modifier(PCall::join_candidates_selectors());
tester.test_default_modifier(PCall::schedule_leave_candidates_selectors());
tester.test_default_modifier(PCall::execute_leave_candidates_selectors());
tester.test_default_modifier(PCall::cancel_leave_candidates_selectors());
tester.test_default_modifier(PCall::go_offline_selectors());
tester.test_default_modifier(PCall::go_online_selectors());
tester.test_default_modifier(PCall::candidate_bond_more_selectors());
tester.test_default_modifier(PCall::schedule_candidate_bond_less_selectors());
tester.test_default_modifier(PCall::execute_candidate_bond_less_selectors());
tester.test_default_modifier(PCall::cancel_candidate_bond_less_selectors());
tester.test_default_modifier(PCall::delegate_with_auto_compound_selectors());
tester.test_default_modifier(PCall::schedule_revoke_delegation_selectors());
tester.test_default_modifier(PCall::delegator_bond_more_selectors());
tester.test_default_modifier(PCall::schedule_delegator_bond_less_selectors());
tester.test_default_modifier(PCall::execute_delegation_request_selectors());
tester.test_default_modifier(PCall::cancel_delegation_request_selectors());
tester.test_view_modifier(PCall::get_delegator_total_staked_selectors());
tester.test_view_modifier(PCall::get_candidate_total_counted_selectors());
});
fn selector_less_than_four_bytes() {
precompiles()
.prepare_test(Alice, Precompile1, vec![1u8, 2u8, 3u8])
.execute_reverts(|output| output == b"Tried to read selector out of bounds");
fn no_selector_exists_but_length_is_right() {
.prepare_test(Alice, Precompile1, vec![1u8, 2u8, 3u8, 4u8])
.execute_reverts(|output| output == b"Unknown selector");
fn min_delegation_works() {
.prepare_test(Alice, Precompile1, PCall::min_delegation {})
.expect_cost(0) // TODO: Test db read/write costs
.expect_no_logs()
.execute_returns(3u32)
fn points_zero() {
ExtBuilder::default()
.with_balances(vec![(Alice.into(), 1_000)])
.with_candidates(vec![(Alice.into(), 1_000)])
.build()
.execute_with(|| {
// Assert that there are total 0 points in round 1
.prepare_test(Alice, Precompile1, PCall::points { round: 1.into() })
.execute_returns(0u32);
fn points_non_zero() {
set_points(1u32, Alice, 100);
// Assert that there are total 100 points in round 1
.execute_returns(100u32);
fn awarded_points_zero() {
.prepare_test(
Alice,
Precompile1,
PCall::awarded_points {
round: 1u32.into(),
candidate: Address(Bob.into()),
},
)
.expect_cost(0)
fn awarded_points_non_zero() {
set_points(1u32, Bob, 10);
candidate: Address(Alice.into()),
fn delegation_amount_zero() {
PCall::delegation_amount {
delegator: Address(Alice.into()),
fn delegation_amount_nonzero() {
.with_balances(vec![(Alice.into(), 1_000), (Bob.into(), 1_000)])
.with_delegations(vec![(Bob.into(), Alice.into(), 1_000)])
delegator: Address(Bob.into()),
.execute_returns(1000u32);
fn is_not_in_top_delegations_when_delegation_dne() {
.execute_returns(false);
fn is_not_in_top_delegations_because_not_in_top() {
.with_balances(vec![
(Alice.into(), 1_000),
(Bob.into(), 500),
(Charlie.into(), 501),
(David.into(), 502),
])
.with_delegations(vec![
(Bob.into(), Alice.into(), 500),
(Charlie.into(), Alice.into(), 501),
(David.into(), Alice.into(), 502),
PCall::is_in_top_delegations {
fn is_in_top_delegations() {
.with_balances(vec![(Alice.into(), 1_000), (Bob.into(), 500)])
.with_delegations(vec![(Bob.into(), Alice.into(), 500)])
.execute_returns(true);
fn round_works() {
.prepare_test(Alice, Precompile1, PCall::round {})
.execute_returns(1u32);
// test next `ROUNDS_TO_TEST` rounds
const ROUNDS_TO_TEST: u32 = 10;
let mut current_round = 1;
while current_round < ROUNDS_TO_TEST {
current_round += 1;
roll_to_round_begin(current_round);
// Assert that round is equal to expectation
.execute_returns(current_round);
fn candidate_delegation_count_works() {
(Bob.into(), 50),
(Charlie.into(), 50),
(David.into(), 50),
(Bob.into(), Alice.into(), 50),
(Charlie.into(), Alice.into(), 50),
(David.into(), Alice.into(), 50),
// Assert that there 3 delegations to Alice
PCall::candidate_delegation_count {
.execute_returns(3u32);
fn candidate_auto_compounding_delegation_count_works() {
.with_auto_compounding_delegations(vec![(
Charlie.into(),
Alice.into(),
50,
Percent::from_percent(50),
)])
// Assert that there 1 auto compounding delegations to Alice
PCall::candidate_auto_compounding_delegation_count {
fn candidate_auto_compounding_elegation_count_works_with_zero() {
// Assert that there 0 auto compounding delegations to Alice
fn delegator_delegation_count_works() {
(Bob.into(), 1_000),
(Charlie.into(), 200),
.with_candidates(vec![(Alice.into(), 1_000), (Bob.into(), 1_000)])
(Charlie.into(), Alice.into(), 100),
(Charlie.into(), Bob.into(), 100),
// Assert that Charlie has 2 outstanding nominations
PCall::delegator_delegation_count {
delegator: Address(Charlie.into()),
.execute_returns(2u32);
fn is_delegator_false() {
// Assert that Charlie is not a delegator
PCall::is_delegator {
fn is_delegator_true() {
.with_balances(vec![(Alice.into(), 1_000), (Bob.into(), 50)])
.with_delegations(vec![(Bob.into(), Alice.into(), 50)])
// Assert that Bob is a delegator
fn is_candidate_false() {
// Assert that Alice is not a candidate
PCall::is_candidate {
fn is_candidate_true() {
// Assert that Alice is a candidate
fn is_selected_candidate_false() {
// Assert that Alice is not a selected candidate
PCall::is_selected_candidate {
fn is_selected_candidate_true() {
fn selected_candidates_works() {
.prepare_test(Alice, Precompile1, PCall::selected_candidates {})
.execute_returns(vec![Address(Alice.into())]);
fn delegation_request_is_pending_works() {
.with_delegations(vec![(Charlie.into(), Alice.into(), 50)])
// Assert that we dont have pending requests
PCall::delegation_request_is_pending {
// Schedule Revoke request
Charlie,
PCall::schedule_revoke_delegation {
.expect_cost(10798)
.execute_returns(());
// Assert that we have pending requests
})
fn delegation_request_is_pending_returns_false_for_non_existing_delegator() {
// Expected false because delegator Bob does not exist
fn candidate_exit_is_pending_works() {
// Assert that we don't have pending requests
PCall::candidate_exit_is_pending {
// Schedule exit request
PCall::schedule_leave_candidates {
candidate_count: 1.into(),
.expect_cost(10787)
// Assert that we have pending exit
fn candidate_exit_is_pending_returns_false_for_non_existing_delegator() {
// Expected false because candidate Bob does not exist
fn candidate_request_is_pending_works() {
.with_balances(vec![(Alice.into(), 1_050)])
.with_candidates(vec![(Alice.into(), 1_050)])
PCall::candidate_request_is_pending {
// Schedule bond less request
PCall::schedule_candidate_bond_less { less: 0.into() },
.expect_cost(5520)
fn candidate_request_is_pending_returns_false_for_non_existing_candidate() {
fn delegation_auto_compound_returns_value_if_set() {
.with_balances(vec![(Alice.into(), 1_000), (Charlie.into(), 50)])
PCall::delegation_auto_compound {
.execute_returns(50u8);
fn delegation_auto_compound_returns_zero_if_not_set() {
.execute_returns(0u8);
fn join_candidates_works() {
let input_data = PCall::join_candidates {
amount: 1000.into(),
candidate_count: 0.into(),
.into();
// Make sure the call goes through successfully
assert_ok!(
RuntimeCall::Evm(evm_call(Alice, input_data)).dispatch(RuntimeOrigin::root())
);
let expected: crate::mock::RuntimeEvent = StakingEvent::JoinedCollatorCandidates {
account: Alice.into(),
amount_locked: 1000,
new_total_amt_locked: 1000,
// Assert that the events vector contains the one expected
println!("{:?}", events());
assert!(events().contains(&expected));
fn schedule_leave_candidates_works() {
let input_data = PCall::schedule_leave_candidates {
let expected: crate::mock::RuntimeEvent = StakingEvent::CandidateScheduledExit {
exit_allowed_round: 1,
candidate: Alice.into(),
scheduled_exit: 3,
fn execute_leave_candidates_works() {
assert_ok!(ParachainStaking::schedule_leave_candidates(
RuntimeOrigin::signed(Alice.into()),
1
));
roll_to(10);
let input_data = PCall::execute_leave_candidates {
let expected: crate::mock::RuntimeEvent = StakingEvent::CandidateLeft {
ex_candidate: Alice.into(),
unlocked_amount: 1_000,
new_total_amt_locked: 0,
fn cancel_leave_candidates_works() {
let input_data = PCall::cancel_leave_candidates {
let expected: crate::mock::RuntimeEvent = StakingEvent::CancelledCandidateExit {
fn go_online_works() {
assert_ok!(ParachainStaking::go_offline(RuntimeOrigin::signed(
Alice.into()
)));
let input_data = PCall::go_online {}.into();
let expected: crate::mock::RuntimeEvent = StakingEvent::CandidateBackOnline {
fn go_offline_works() {
let input_data = PCall::go_offline {}.into();
let expected: crate::mock::RuntimeEvent = StakingEvent::CandidateWentOffline {
fn candidate_bond_more_works() {
.with_balances(vec![(Alice.into(), 1_500)])
let input_data = PCall::candidate_bond_more { more: 500.into() }.into();
let expected: crate::mock::RuntimeEvent = StakingEvent::CandidateBondedMore {
amount: 500,
new_total_bond: 1500,
fn schedule_candidate_bond_less_works() {
let input_data = PCall::schedule_candidate_bond_less { less: 500.into() }.into();
let expected: crate::mock::RuntimeEvent = StakingEvent::CandidateBondLessRequested {
amount_to_decrease: 500,
execute_round: 3,
fn execute_candidate_bond_less_works() {
.with_candidates(vec![(Alice.into(), 1_500)])
assert_ok!(ParachainStaking::schedule_candidate_bond_less(
500
let input_data = PCall::execute_candidate_bond_less {
let expected: crate::mock::RuntimeEvent = StakingEvent::CandidateBondedLess {
new_bond: 1000,
fn cancel_candidate_bond_less_works() {
.with_balances(vec![(Alice.into(), 1_200)])
.with_candidates(vec![(Alice.into(), 1_200)])
200
let input_data = PCall::cancel_candidate_bond_less {}.into();
let expected: crate::mock::RuntimeEvent = StakingEvent::CancelledCandidateBondLess {
amount: 200,
fn delegate_works() {
let input_data = PCall::delegate_with_auto_compound {
amount: 1_000.into(),
auto_compound: 0.into(),
candidate_delegation_count: 0.into(),
candidate_auto_compounding_delegation_count: 0.into(),
delegator_delegation_count: 0.into(),
assert_ok!(RuntimeCall::Evm(evm_call(Bob, input_data)).dispatch(RuntimeOrigin::root()));
assert!(ParachainStaking::is_delegator(&Bob.into()));
let expected: crate::mock::RuntimeEvent = StakingEvent::Delegation {
delegator: Bob.into(),
locked_amount: 1_000,
delegator_position: pallet_parachain_staking::DelegatorAdded::AddedToTop {
new_total: 2_000,
auto_compound: Percent::zero(),
fn schedule_revoke_delegation_works() {
let input_data = PCall::schedule_revoke_delegation {
let expected: crate::mock::RuntimeEvent = StakingEvent::DelegationRevocationScheduled {
round: 1,
fn delegator_bond_more_works() {
.with_balances(vec![(Alice.into(), 1_000), (Bob.into(), 1_500)])
let input_data = PCall::delegator_bond_more {
more: 500.into(),
let expected: crate::mock::RuntimeEvent = StakingEvent::DelegationIncreased {
in_top: true,
fn schedule_delegator_bond_less_works() {
.with_delegations(vec![(Bob.into(), Alice.into(), 1_500)])
let input_data = PCall::schedule_delegator_bond_less {
less: 500.into(),
// Check for the right events.
let expected_event: crate::mock::RuntimeEvent =
StakingEvent::DelegationDecreaseScheduled {
assert!(events().contains(&expected_event));
fn execute_revoke_delegation_works() {
assert_ok!(ParachainStaking::schedule_revoke_delegation(
RuntimeOrigin::signed(Bob.into()),
let input_data = PCall::execute_delegation_request {
let expected: crate::mock::RuntimeEvent = StakingEvent::DelegationRevoked {
unstaked_amount: 1_000,
fn execute_delegator_bond_less_works() {
assert_ok!(ParachainStaking::schedule_delegator_bond_less(
let expected: crate::mock::RuntimeEvent = StakingEvent::DelegationDecreased {
fn cancel_revoke_delegation_works() {
let input_data = PCall::cancel_delegation_request {
let expected: crate::mock::RuntimeEvent = StakingEvent::CancelledDelegationRequest {
collator: Alice.into(),
cancelled_request: pallet_parachain_staking::CancelledScheduledRequest {
when_executable: 3,
action: pallet_parachain_staking::DelegationAction::Revoke(1_000),
fn cancel_delegator_bonded_less_works() {
action: pallet_parachain_staking::DelegationAction::Decrease(500),
fn delegate_with_auto_compound_works() {
for auto_compound_percent in [0, 50, 100] {
auto_compound: auto_compound_percent,
RuntimeCall::Evm(evm_call(Bob, input_data)).dispatch(RuntimeOrigin::root())
auto_compound: Percent::from_percent(auto_compound_percent),
fn delegate_with_auto_compound_returns_error_if_percent_above_hundred() {
for auto_compound_percent in [101, 255] {
Bob,
PCall::delegate_with_auto_compound {
.execute_reverts(|output| {
from_utf8(&output).unwrap().contains(
"auto_compound: Must be an integer between 0 and 100 included",
fn set_auto_compound_works_if_delegation() {
let input_data = PCall::set_auto_compound {
value: auto_compound_percent,
delegator_delegation_count: 1.into(),
assert_eq!(
ParachainStaking::delegation_auto_compound(&Alice.into(), &Bob.into()),
Percent::from_percent(auto_compound_percent)
let expected: crate::mock::RuntimeEvent = StakingEvent::AutoCompoundSet {
value: Percent::from_percent(auto_compound_percent),
fn set_auto_compound_returns_error_if_value_above_hundred_percent() {
PCall::set_auto_compound {
from_utf8(&output)
.unwrap()
.contains("value: Must be an integer between 0 and 100 included")
fn set_auto_compound_fails_if_not_delegation() {
.with_balances(vec![(Alice.into(), 1000), (Bob.into(), 1000)])
value: 50,
.execute_reverts(|output| from_utf8(&output).unwrap().contains("DelegatorDNE"));
fn get_delegator_total_staked_getter() {
(Charlie.into(), 1_500),
(Charlie.into(), Alice.into(), 1_000),
(Charlie.into(), Bob.into(), 499),
PCall::get_delegator_total_staked {
.execute_returns(U256::from(1_499));
fn get_delegator_total_staked_getter_unknown() {
.execute_returns(U256::zero());
fn get_candidate_total_counted_getter() {
PCall::get_candidate_total_counted {
.execute_returns(U256::from(2_000));
fn test_solidity_interface_has_all_function_selectors_documented_and_implemented() {
check_precompile_implements_solidity_interfaces(
&["StakingInterface.sol"],
PCall::supports_selector,
fn test_deprecated_solidity_selectors_are_supported() {
for deprecated_function in [
"min_delegation()",
"candidate_count()",
"candidate_delegation_count(address)",
"delegator_delegation_count(address)",
"selected_candidates()",
"is_delegator(address)",
"is_candidate(address)",
"is_selected_candidate(address)",
"delegation_request_is_pending(address,address)",
"candidate_exit_is_pending(address)",
"candidate_request_is_pending(address)",
"join_candidates(uint256,uint256)",
"schedule_leave_candidates(uint256)",
"execute_leave_candidates(address,uint256)",
"cancel_leave_candidates(uint256)",
"go_offline()",
"go_online()",
"schedule_candidate_bond_less(uint256)",
"candidate_bond_more(uint256)",
"execute_candidate_bond_less(address)",
"cancel_candidate_bond_less()",
"schedule_revoke_delegation(address)",
"schedule_delegator_bond_less(address,uint256)",
"delegator_bond_more(address,uint256)",
"execute_delegation_request(address,address)",
"cancel_delegation_request(address)",
] {
let selector = compute_selector(deprecated_function);
if !PCall::supports_selector(selector) {
panic!(
"failed decoding selector 0x{:x} => '{}' as Action",
selector, deprecated_function,