wp-evm-ramses-core 0.1.2

//! Pure plan functions for the Ramses family.

use crate::data::{
    CollectFeesParams, ExactInParams, GaugeClaim, GaugeEarnedGrid, PlanFragment, PoolState, Quote,
    RamsesAddLiquidityParams, RemoveAndCollectParams, RemoveLiquidityParams,
};
use alloy_primitives::{Address, U256};
use alloy_sol_types::{sol, SolCall};
use wp_evm_base::types::{Call, SlippageBps, TokenApproval};
use wp_evm_ramses_interfaces::gauge::IRamsesVoter;
use wp_evm_v3_core::plan::apply_slippage_min;
use wp_evm_velodrome_interfaces::gauge::IVelodromeCLGauge;

sol! {
    #[derive(Debug)]
    struct ExactInputSingleParams {
        address tokenIn;
        address tokenOut;
        int24   tickSpacing;
        address recipient;
        uint256 deadline;
        uint256 amountIn;
        uint256 amountOutMinimum;
        uint160 sqrtPriceLimitX96;
    }

    function exactInputSingle(ExactInputSingleParams params)
        external payable returns (uint256 amountOut);
}

pub(crate) mod shadow_nfpm {
    use alloy_sol_types::sol;

    sol! {
        #[derive(Debug)]
        struct ShadowMintParams {
            address token0;
            address token1;
            int24   tickSpacing;
            int24   tickLower;
            int24   tickUpper;
            uint256 amount0Desired;
            uint256 amount1Desired;
            uint256 amount0Min;
            uint256 amount1Min;
            address recipient;
            uint256 deadline;
        }
        function mint(ShadowMintParams params) external payable
            returns (uint256 tokenId, uint128 liquidity, uint256 amount0, uint256 amount1);
    }
}

pub(crate) mod slipstream_nfpm {
    use alloy_sol_types::sol;

    sol! {
        #[derive(Debug)]
        struct SlipstreamMintParams {
            address token0;
            address token1;
            int24   tickSpacing;
            int24   tickLower;
            int24   tickUpper;
            uint256 amount0Desired;
            uint256 amount1Desired;
            uint256 amount0Min;
            uint256 amount1Min;
            address recipient;
            uint256 deadline;
            uint160 sqrtPriceX96;
        }
        function mint(SlipstreamMintParams params) external payable
            returns (uint256 tokenId, uint128 liquidity, uint256 amount0, uint256 amount1);
    }
}

use shadow_nfpm::{mintCall as shadowMintCall, ShadowMintParams};
use slipstream_nfpm::{mintCall as slipstreamMintCall, SlipstreamMintParams};

pub fn swap_exact_in(
    state: &PoolState,
    quote: &Quote,
    params: &ExactInParams,
    slippage: SlippageBps,
    deadline: u64,
    router: Address,
) -> PlanFragment {
    let amount_out_min = apply_slippage_min(quote.amount_out, slippage);

    let call_params = ExactInputSingleParams {
        tokenIn: params.token_in,
        tokenOut: params.token_out,
        tickSpacing: alloy_primitives::aliases::I24::try_from(state.tick_spacing)
            .expect("tick_spacing fits in i24"),
        recipient: params.recipient,
        deadline: U256::from(deadline),
        amountIn: params.amount_in,
        amountOutMinimum: amount_out_min,
        sqrtPriceLimitX96: alloy_primitives::aliases::U160::ZERO,
    };

    let calldata = exactInputSingleCall { params: call_params }.abi_encode().into();

    PlanFragment {
        calls: vec![Call { target: router, calldata, value: U256::ZERO }],
        approvals: vec![TokenApproval {
            token: params.token_in,
            spender: router,
            min_amount: params.amount_in,
        }],
        value: U256::ZERO,
    }
}

pub fn add_liquidity(
    params: &RamsesAddLiquidityParams,
    slippage: SlippageBps,
    deadline: u64,
    position_manager: Address,
) -> PlanFragment {
    let mint_params = ShadowMintParams {
        token0: params.token0,
        token1: params.token1,
        tickSpacing: alloy_primitives::aliases::I24::try_from(params.tick_spacing)
            .expect("tick_spacing fits in i24"),
        tickLower: alloy_primitives::aliases::I24::try_from(params.tick_lower)
            .expect("tick_lower within i24 range"),
        tickUpper: alloy_primitives::aliases::I24::try_from(params.tick_upper)
            .expect("tick_upper within i24 range"),
        amount0Desired: params.amount0_desired,
        amount1Desired: params.amount1_desired,
        amount0Min: apply_slippage_min(params.amount0_desired, slippage),
        amount1Min: apply_slippage_min(params.amount1_desired, slippage),
        recipient: params.recipient,
        deadline: U256::from(deadline),
    };
    let calldata = shadowMintCall { params: mint_params }.abi_encode().into();
    PlanFragment {
        calls: vec![Call { target: position_manager, calldata, value: U256::ZERO }],
        approvals: vec![
            TokenApproval {
                token: params.token0,
                spender: position_manager,
                min_amount: params.amount0_desired,
            },
            TokenApproval {
                token: params.token1,
                spender: position_manager,
                min_amount: params.amount1_desired,
            },
        ],
        value: U256::ZERO,
    }
}

pub fn add_liquidity_slipstream(
    params: &RamsesAddLiquidityParams,
    slippage: SlippageBps,
    deadline: u64,
    position_manager: Address,
) -> PlanFragment {
    let mint_params = SlipstreamMintParams {
        token0: params.token0,
        token1: params.token1,
        tickSpacing: alloy_primitives::aliases::I24::try_from(params.tick_spacing)
            .expect("tick_spacing fits in i24"),
        tickLower: alloy_primitives::aliases::I24::try_from(params.tick_lower)
            .expect("tick_lower within i24 range"),
        tickUpper: alloy_primitives::aliases::I24::try_from(params.tick_upper)
            .expect("tick_upper within i24 range"),
        amount0Desired: params.amount0_desired,
        amount1Desired: params.amount1_desired,
        amount0Min: apply_slippage_min(params.amount0_desired, slippage),
        amount1Min: apply_slippage_min(params.amount1_desired, slippage),
        recipient: params.recipient,
        deadline: U256::from(deadline),
        sqrtPriceX96: alloy_primitives::aliases::U160::ZERO,
    };
    let calldata = slipstreamMintCall { params: mint_params }.abi_encode().into();
    PlanFragment {
        calls: vec![Call { target: position_manager, calldata, value: U256::ZERO }],
        approvals: vec![
            TokenApproval {
                token: params.token0,
                spender: position_manager,
                min_amount: params.amount0_desired,
            },
            TokenApproval {
                token: params.token1,
                spender: position_manager,
                min_amount: params.amount1_desired,
            },
        ],
        value: U256::ZERO,
    }
}

#[allow(clippy::too_many_arguments)]
pub fn increase_liquidity(
    token_id: alloy_primitives::U256,
    token0: alloy_primitives::Address,
    token1: alloy_primitives::Address,
    amount0_desired: alloy_primitives::U256,
    amount1_desired: alloy_primitives::U256,
    slippage: SlippageBps,
    deadline: u64,
    position_manager: Address,
) -> PlanFragment {
    wp_evm_v3_core::plan::increase_liquidity(
        token_id,
        token0,
        token1,
        amount0_desired,
        amount1_desired,
        slippage,
        deadline,
        position_manager,
    )
}

pub fn remove_liquidity(
    params: &RemoveLiquidityParams,
    deadline: u64,
    position_manager: Address,
) -> PlanFragment {
    wp_evm_v3_core::plan::remove_liquidity(params, deadline, position_manager)
}

/// Build an atomic `multicall(decreaseLiquidity, collect)` plan fragment
/// for a Ramses-family NFPM position.
///
/// Delegates straight to `wp_evm_v3_core::plan::remove_liquidity_and_collect`
/// — Ramses-fork NFPMs inherit V3's `decreaseLiquidity` + `collect` + outer
/// `multicall(bytes[])` byte-for-byte (the family's structural divergence
/// from V3 is `tickSpacing` instead of `fee` in mint params; remove+collect
/// has no `fee` / `tickSpacing` field on the inner ABI). Mirrors this
/// module's `remove_liquidity` one-line delegation.
///
/// Native-unwrap composition is NOT done here — the facade layer pairs
/// this with `compose_native_remove_collect_multicall`.
pub fn remove_liquidity_and_collect(
    params: &RemoveAndCollectParams,
    deadline: u64,
    position_manager: Address,
) -> PlanFragment {
    wp_evm_v3_core::plan::remove_liquidity_and_collect(params, deadline, position_manager)
}

pub fn collect_fees(params: &CollectFeesParams, position_manager: Address) -> PlanFragment {
    wp_evm_v3_core::plan::collect_fees(params, position_manager)
}

/// Encode a batched Ramses-family CL gauge reward claim.
///
/// Produces a single `Call` to the **Voter** (`claimClGaugeRewards`),
/// `value: 0`, no approvals. `voter` is caller-supplied (no config lookup) —
/// matching `claim_gauge`'s param style. `claims` carries one entry per
/// gauge; pass an empty slice and you get an empty-array call (caller's
/// responsibility to avoid).
pub fn claim_cl_gauge_rewards(voter: Address, claims: &[GaugeClaim]) -> PlanFragment {
    let gauges: Vec<Address> = claims.iter().map(|c| c.gauge).collect();
    let tokens: Vec<Vec<Address>> = claims.iter().map(|c| c.reward_tokens.clone()).collect();
    let nfp_token_ids: Vec<Vec<U256>> = claims.iter().map(|c| c.token_ids.clone()).collect();
    let calldata = IRamsesVoter::claimClGaugeRewardsCall {
        _gauges: gauges,
        _tokens: tokens,
        _nfpTokenIds: nfp_token_ids,
    }
    .abi_encode()
    .into();
    PlanFragment {
        calls: vec![Call { target: voter, calldata, value: U256::ZERO }],
        approvals: vec![],
        value: U256::ZERO,
    }
}

/// Encode a single-token Velodrome/Aerodrome gauge claim
/// (`getReward(uint256)` on the gauge). Hoisted from the Slipstream facade so
/// the selector is interface-locked in `wp-evm-velodrome-interfaces`.
pub fn claim_gauge(gauge: Address, token_id: U256) -> PlanFragment {
    let calldata = IVelodromeCLGauge::getRewardCall { tokenId: token_id }.abi_encode().into();
    PlanFragment {
        calls: vec![Call { target: gauge, calldata, value: U256::ZERO }],
        approvals: vec![],
        value: U256::ZERO,
    }
}

/// Group raw `earned` grids into claimable `GaugeClaim`s, pruning per-pair
/// zeros. A reward token is kept only if some position earns it; a position
/// is kept only if it earns some token. A gauge emptied by pruning is
/// dropped. Never inspects `isAlive` — de-listed gauges still hold claimable
/// `earned`. Mirrors arbitrage `filter_items_with_non_zero_rewards`.
pub fn build_gauge_claims(grids: &[GaugeEarnedGrid]) -> Vec<GaugeClaim> {
    let mut out = Vec::new();
    for g in grids {
        let kept_tokens: Vec<usize> = (0..g.reward_tokens.len())
            .filter(|&t| (0..g.token_ids.len()).any(|p| g.earned[t][p] > U256::ZERO))
            .collect();
        let kept_positions: Vec<usize> = (0..g.token_ids.len())
            .filter(|&p| (0..g.reward_tokens.len()).any(|t| g.earned[t][p] > U256::ZERO))
            .collect();
        if kept_tokens.is_empty() || kept_positions.is_empty() {
            continue;
        }
        out.push(GaugeClaim {
            gauge: g.gauge,
            reward_tokens: kept_tokens.iter().map(|&t| g.reward_tokens[t]).collect(),
            token_ids: kept_positions.iter().map(|&p| g.token_ids[p]).collect(),
        });
    }
    out
}

/// Prune raw `earned` grids and encode the batched claim in one step. Returns
/// `None` when nothing survives pruning — the caller's "never submit an empty
/// claim tx" contract. `voter` is caller-supplied. Pure, so the `None`-collapse
/// is unit-testable without a provider (the async facade is a thin wrapper).
pub fn claim_cl_gauge_rewards_from_grids(
    voter: Address,
    grids: &[GaugeEarnedGrid],
) -> Option<PlanFragment> {
    let claims = build_gauge_claims(grids);
    if claims.is_empty() {
        None
    } else {
        Some(claim_cl_gauge_rewards(voter, &claims))
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use alloy_primitives::{address, Address};

    const ROUTER: Address = address!("0x2222222222222222222222222222222222222222");
    const POSITION_MANAGER: Address = address!("0x3333333333333333333333333333333333333333");

    fn dummy_pool_state(t0: Address, t1: Address) -> PoolState {
        PoolState {
            token0: t0,
            token1: t1,
            fee: 0,
            tick_spacing: 50,
            sqrt_price_x96: U256::from(1u64) << 96,
            liquidity: 0,
            tick: 0,
            ticks: vec![],
        }
    }

    #[test]
    fn plan_swap_emits_ramses_selector() {
        let token_in = address!("0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48");
        let token_out = address!("0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2");
        let s = dummy_pool_state(token_in, token_out);
        let q = Quote {
            amount_in: U256::from(1_000_000u64),
            amount_out: U256::from(500_000_000_000_000u64),
            sqrt_price_x96_after: s.sqrt_price_x96,
            price_impact_bps: 0,
        };
        let p = ExactInParams {
            token_in,
            token_out,
            amount_in: q.amount_in,
            recipient: address!("0x0000000000000000000000000000000000000099"),
        };
        let frag = swap_exact_in(&s, &q, &p, SlippageBps::new(50), 9_999_999_999, ROUTER);
        assert_eq!(frag.calls.len(), 1);
        assert_eq!(frag.calls[0].target, ROUTER);
        assert_eq!(&frag.calls[0].calldata[..4], &[0xa0, 0x26, 0x38, 0x3e]);
    }

    #[test]
    fn plan_swap_encodes_tick_spacing_not_fee() {
        let token_in = address!("0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48");
        let token_out = address!("0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2");
        let mut s = dummy_pool_state(token_in, token_out);
        s.tick_spacing = 200;
        let q = Quote {
            amount_in: U256::from(1_000_000u64),
            amount_out: U256::from(500_000_000_000_000u64),
            sqrt_price_x96_after: s.sqrt_price_x96,
            price_impact_bps: 0,
        };
        let p = ExactInParams {
            token_in,
            token_out,
            amount_in: q.amount_in,
            recipient: address!("0x0000000000000000000000000000000000000099"),
        };
        let frag = swap_exact_in(&s, &q, &p, SlippageBps::new(50), 9_999_999_999, ROUTER);
        let decoded = exactInputSingleCall::abi_decode(&frag.calls[0].calldata).expect("decode ok");
        assert_eq!(
            decoded.params.tickSpacing,
            alloy_primitives::aliases::I24::try_from(200i32).unwrap()
        );
    }

    #[test]
    fn add_liquidity_targets_position_manager() {
        let p = RamsesAddLiquidityParams {
            token0: address!("0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"),
            token1: address!("0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2"),
            tick_spacing: 50,
            tick_lower: -887_272,
            tick_upper: 887_272,
            amount0_desired: U256::from(1_000_000u64),
            amount1_desired: U256::from(500_000_000_000_000u64),
            recipient: address!("0x0000000000000000000000000000000000000099"),
        };
        let frag = add_liquidity(&p, SlippageBps::new(50), 9_999_999_999, POSITION_MANAGER);
        assert_eq!(frag.calls[0].target, POSITION_MANAGER);
        assert_eq!(frag.approvals.len(), 2);
    }

    #[test]
    fn remove_liquidity_and_collect_targets_position_manager_with_outer_multicall() {
        // Outer call must be `multicall(bytes[])` (selector `0xac9650d8`,
        // universal across V3/Ramses/Velodrome) over exactly 2 inner
        // calls: decreaseLiquidity then collect.
        use alloy_sol_types::SolValue;
        let p = RemoveAndCollectParams {
            token_id: U256::from(1u64),
            liquidity: 1_000u128,
            amount0_min: Some(U256::from(99u64)),
            amount1_min: Some(U256::from(199u64)),
            recipient: address!("0000000000000000000000000000000000000099"),
            token0: address!("0000000000000000000000000000000000000001"),
            token1: address!("0000000000000000000000000000000000000002"),
            caller: Address::ZERO,
        };
        let frag = remove_liquidity_and_collect(&p, 9_999_999_999, POSITION_MANAGER);
        assert_eq!(frag.calls.len(), 1);
        assert_eq!(frag.calls[0].target, POSITION_MANAGER);
        assert_eq!(
            &frag.calls[0].calldata[..4],
            &[0xac, 0x96, 0x50, 0xd8],
            "outer selector must be multicall(bytes[])"
        );
        assert!(frag.approvals.is_empty());
        assert_eq!(frag.value, U256::ZERO);

        // Decode outer and assert inner pair: decreaseLiquidity (0x0c49ccbe)
        // followed by collect (0xfc6f7865). These selectors are V3-canonical
        // and Ramses inherits them via the v3-core delegation.
        let (inner,): (Vec<alloy_primitives::Bytes>,) =
            <(Vec<alloy_primitives::Bytes>,)>::abi_decode_params(&frag.calls[0].calldata[4..])
                .expect("decode outer multicall params");
        assert_eq!(inner.len(), 2);
        assert_eq!(&inner[0][..4], &[0x0c, 0x49, 0xcc, 0xbe], "inner[0] = decreaseLiquidity");
        assert_eq!(&inner[1][..4], &[0xfc, 0x6f, 0x78, 0x65], "inner[1] = collect");
    }

    #[test]
    fn remove_liquidity_and_collect_delegation_matches_v3_core_bytewise() {
        // Ramses delegates to v3-core verbatim — proving byte-equality
        // here pins the delegation against accidental local re-encoding.
        let p = RemoveAndCollectParams {
            token_id: U256::from(42u64),
            liquidity: 1_000_000_000_000u128,
            amount0_min: Some(U256::from(500_000u64)),
            amount1_min: Some(U256::from(1_000_000_000u64)),
            recipient: address!("0000000000000000000000000000000000000099"),
            token0: address!("0000000000000000000000000000000000000001"),
            token1: address!("0000000000000000000000000000000000000002"),
            caller: Address::ZERO,
        };
        let ours = remove_liquidity_and_collect(&p, 9_999_999_999, POSITION_MANAGER);
        let core =
            wp_evm_v3_core::plan::remove_liquidity_and_collect(&p, 9_999_999_999, POSITION_MANAGER);
        assert_eq!(ours.calls[0].calldata, core.calls[0].calldata);
        assert_eq!(ours.calls[0].target, core.calls[0].target);
    }

    #[test]
    fn claim_cl_gauge_rewards_targets_voter_with_ordered_arrays() {
        use alloy_sol_types::SolCall;
        let voter = address!("9f59398d0a397b2eEB8a6123a6c7295cb0b0062D");
        let claims = vec![
            GaugeClaim {
                gauge: address!("1111111111111111111111111111111111111111"),
                reward_tokens: vec![
                    address!("aaaa000000000000000000000000000000000000"),
                    address!("bbbb000000000000000000000000000000000000"),
                ],
                token_ids: vec![U256::from(10u64), U256::from(11u64)],
            },
            GaugeClaim {
                gauge: address!("2222222222222222222222222222222222222222"),
                reward_tokens: vec![address!("cccc000000000000000000000000000000000000")],
                token_ids: vec![U256::from(20u64)],
            },
        ];
        let frag = claim_cl_gauge_rewards(voter, &claims);

        assert_eq!(frag.calls.len(), 1);
        assert_eq!(frag.calls[0].target, voter);
        assert!(frag.approvals.is_empty());
        assert_eq!(frag.value, U256::ZERO);
        // selector claimClGaugeRewards(address[],address[][],uint256[][])
        assert_eq!(&frag.calls[0].calldata[..4], &[0xea, 0xb3, 0x7e, 0xec]);

        // Decode and assert positional array order (the byte-equality invariant).
        let decoded =
            wp_evm_ramses_interfaces::gauge::IRamsesVoter::claimClGaugeRewardsCall::abi_decode(
                &frag.calls[0].calldata,
            )
            .expect("decode");
        assert_eq!(decoded._gauges, vec![claims[0].gauge, claims[1].gauge]);
        assert_eq!(decoded._tokens[0], claims[0].reward_tokens);
        assert_eq!(decoded._nfpTokenIds[1], claims[1].token_ids);

        // Byte-equality vs an independently-built reference call (raw arrays,
        // NOT via the GaugeClaim mapping) — pins the GaugeClaim->arg mapping
        // byte-for-byte, which the structural decode above cannot catch.
        let reference = wp_evm_ramses_interfaces::gauge::IRamsesVoter::claimClGaugeRewardsCall {
            _gauges: vec![
                address!("1111111111111111111111111111111111111111"),
                address!("2222222222222222222222222222222222222222"),
            ],
            _tokens: vec![
                vec![
                    address!("aaaa000000000000000000000000000000000000"),
                    address!("bbbb000000000000000000000000000000000000"),
                ],
                vec![address!("cccc000000000000000000000000000000000000")],
            ],
            _nfpTokenIds: vec![vec![U256::from(10u64), U256::from(11u64)], vec![U256::from(20u64)]],
        }
        .abi_encode();
        assert_eq!(&frag.calls[0].calldata[..], &reference[..]);
    }

    #[test]
    fn claim_gauge_targets_gauge_with_get_reward_selector() {
        let gauge = address!("4444444444444444444444444444444444444444");
        let frag = claim_gauge(gauge, U256::from(42u64));
        assert_eq!(frag.calls.len(), 1);
        assert_eq!(frag.calls[0].target, gauge);
        assert!(frag.approvals.is_empty());
        assert_eq!(frag.value, U256::ZERO);
        // getReward(uint256) = 0x1c4b774b
        assert_eq!(&frag.calls[0].calldata[..4], &[0x1c, 0x4b, 0x77, 0x4b]);
    }

    #[test]
    fn claim_cl_gauge_rewards_from_grids_none_when_empty_or_all_zero() {
        let voter = Address::from([9u8; 20]);
        // all-zero grid prunes to nothing -> None
        let zero = grid(0x11, 1, &[1], vec![vec![0]]);
        assert!(claim_cl_gauge_rewards_from_grids(voter, &[zero]).is_none());
        // empty input -> None
        assert!(claim_cl_gauge_rewards_from_grids(voter, &[]).is_none());
    }

    #[test]
    fn claim_cl_gauge_rewards_from_grids_some_targets_voter_when_nonzero() {
        let voter = address!("9f59398d0a397b2eEB8a6123a6c7295cb0b0062D");
        let g = grid(0x11, 1, &[1], vec![vec![7]]);
        let frag = claim_cl_gauge_rewards_from_grids(voter, &[g]).expect("nonzero -> Some");
        assert_eq!(frag.calls[0].target, voter);
        assert_eq!(&frag.calls[0].calldata[..4], &[0xea, 0xb3, 0x7e, 0xec]);
    }

    fn grid(
        gauge_byte: u8,
        tokens: usize,
        ids: &[u64],
        earned: Vec<Vec<u64>>,
    ) -> crate::data::GaugeEarnedGrid {
        crate::data::GaugeEarnedGrid {
            gauge: Address::from([gauge_byte; 20]),
            reward_tokens: (0..tokens).map(|i| Address::from([i as u8 + 1; 20])).collect(),
            token_ids: ids.iter().map(|&i| U256::from(i)).collect(),
            earned: earned.into_iter().map(|r| r.into_iter().map(U256::from).collect()).collect(),
        }
    }

    #[test]
    fn build_gauge_claims_drops_all_zero_token_and_position() {
        // 2 tokens x 2 positions. token[1] all-zero -> dropped.
        // position[0] all-zero -> dropped. Survivor: token[0] x position[1].
        let g = grid(0x11, 2, &[100, 101], vec![vec![0, 5], vec![0, 0]]);
        let claims = build_gauge_claims(&[g]);
        assert_eq!(claims.len(), 1);
        assert_eq!(claims[0].reward_tokens, vec![Address::from([1u8; 20])]);
        assert_eq!(claims[0].token_ids, vec![U256::from(101u64)]);
    }

    #[test]
    fn build_gauge_claims_drops_fully_empty_gauge() {
        let g = grid(0x22, 2, &[1, 2], vec![vec![0, 0], vec![0, 0]]);
        assert!(build_gauge_claims(&[g]).is_empty());
    }

    #[test]
    fn build_gauge_claims_keeps_multiple_gauges() {
        let a = grid(0x11, 1, &[1], vec![vec![9]]);
        let b = grid(0x22, 1, &[2], vec![vec![0]]); // dropped
        let c = grid(0x33, 1, &[3], vec![vec![3]]);
        let claims = build_gauge_claims(&[a, b, c]);
        assert_eq!(claims.len(), 2);
        assert_eq!(claims[0].gauge, Address::from([0x11u8; 20]));
        assert_eq!(claims[1].gauge, Address::from([0x33u8; 20]));
    }

    #[test]
    fn build_gauge_claims_empty_input_empty_output() {
        assert!(build_gauge_claims(&[]).is_empty());
    }
}