mirror of
https://github.com/0glabs/0g-chain.git
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190 lines
7.1 KiB
Go
190 lines
7.1 KiB
Go
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package keeper_test
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import (
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"math/big"
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"testing"
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sdkmath "cosmossdk.io/math"
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"github.com/stretchr/testify/require"
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sdk "github.com/cosmos/cosmos-sdk/types"
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"github.com/kava-labs/kava/x/community/keeper"
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)
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func TestStakingRewardsCalculator(t *testing.T) {
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hugeInflation := new(big.Int).Exp(big.NewInt(2), big.NewInt(205), nil)
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hugeRewardsPerSec := new(big.Int).Exp(big.NewInt(2), big.NewInt(230), nil)
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testCases := []struct {
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name string
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totalSupply sdkmath.Int
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totalBonded sdkmath.Int
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inflation sdkmath.LegacyDec
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communityTax sdkmath.LegacyDec
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perSecReward sdkmath.LegacyDec
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expectedRate sdkmath.LegacyDec
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}{
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{
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name: "no inflation, no rewards per sec -> 0%",
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totalSupply: sdkmath.ZeroInt(),
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totalBonded: sdkmath.ZeroInt(),
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inflation: sdkmath.LegacyZeroDec(),
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communityTax: sdkmath.LegacyZeroDec(),
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perSecReward: sdkmath.LegacyZeroDec(),
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expectedRate: sdkmath.LegacyZeroDec(),
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},
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//
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//
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// inflation-only
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//
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//
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{
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name: "inflation only: no bonded tokens -> 0%",
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totalSupply: sdk.NewInt(42),
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totalBonded: sdkmath.ZeroInt(),
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inflation: sdkmath.LegacyOneDec(),
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communityTax: sdkmath.LegacyZeroDec(),
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perSecReward: sdkmath.LegacyZeroDec(),
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expectedRate: sdkmath.LegacyZeroDec(),
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},
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{
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name: "inflation only: 0% inflation -> 0%",
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totalSupply: sdk.NewInt(123),
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totalBonded: sdkmath.NewInt(45),
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inflation: sdkmath.LegacyZeroDec(),
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communityTax: sdkmath.LegacyZeroDec(),
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perSecReward: sdkmath.LegacyZeroDec(),
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expectedRate: sdkmath.LegacyZeroDec(),
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},
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{
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name: "inflation only: 100% bonded w/ 100% inflation -> 100%",
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totalSupply: sdk.NewInt(42),
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totalBonded: sdk.NewInt(42),
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inflation: sdkmath.LegacyOneDec(),
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communityTax: sdkmath.LegacyZeroDec(),
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perSecReward: sdkmath.LegacyZeroDec(),
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expectedRate: sdkmath.LegacyOneDec(),
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},
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{
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name: "inflation only: 100% community tax -> 0%",
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totalSupply: sdk.NewInt(123),
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totalBonded: sdkmath.NewInt(45),
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inflation: sdkmath.LegacyMustNewDecFromStr("0.853"),
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communityTax: sdkmath.LegacyOneDec(),
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perSecReward: sdkmath.LegacyZeroDec(),
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expectedRate: sdkmath.LegacyZeroDec(),
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},
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{
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name: "inflation only: Oct 2023 case",
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totalSupply: sdk.NewInt(857570000e6),
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totalBonded: sdk.NewInt(127680000e6),
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inflation: sdkmath.LegacyMustNewDecFromStr("0.595"),
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communityTax: sdkmath.LegacyMustNewDecFromStr("0.9495"),
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perSecReward: sdkmath.LegacyZeroDec(),
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// expect 20.18% staking reward
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expectedRate: sdkmath.LegacyMustNewDecFromStr("0.201815746984649122"), // verified manually
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},
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{
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name: "inflation only: low inflation",
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totalSupply: sdk.NewInt(857570000e6),
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totalBonded: sdk.NewInt(127680000e6),
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inflation: sdkmath.LegacyMustNewDecFromStr("0.0000000001"),
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communityTax: sdkmath.LegacyMustNewDecFromStr("0.9495"),
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perSecReward: sdkmath.LegacyZeroDec(),
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expectedRate: sdkmath.LegacyMustNewDecFromStr("0.000000000033918612"), // verified manually, rounded would be 0.000000000033918613
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},
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{
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name: "inflation only: absurdly high inflation",
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totalSupply: sdk.NewInt(857570000e6),
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totalBonded: sdk.NewInt(127680000e6),
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inflation: sdkmath.LegacyNewDecFromBigInt(hugeInflation), // 2^205. a higher exponent than this overflows.
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communityTax: sdkmath.LegacyMustNewDecFromStr("0.9495"),
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perSecReward: sdkmath.LegacyZeroDec(),
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// https://www.wolframalpha.com/input?i=%282%5E205%29+*+%281+-+0.9495%29+*+%28857570000e6+%2F127680000e6%29
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expectedRate: sdkmath.LegacyMustNewDecFromStr("17441635052648297161685283657196753398188161373334495592570113.113824561403508771"), // verified manually, would round up
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},
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//
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//
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// rewards-only
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//
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//
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{
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name: "rps only: no bonded tokens -> 0%",
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totalSupply: sdk.NewInt(42),
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totalBonded: sdkmath.ZeroInt(),
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inflation: sdkmath.LegacyZeroDec(),
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communityTax: sdkmath.LegacyZeroDec(),
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perSecReward: sdkmath.LegacyMustNewDecFromStr("1234567.123456"),
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expectedRate: sdkmath.LegacyZeroDec(),
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},
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{
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name: "rps only: rps = total bonded / seconds in year -> basically 100%",
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totalSupply: sdk.NewInt(12345),
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totalBonded: sdkmath.NewInt(1234),
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inflation: sdkmath.LegacyZeroDec(),
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communityTax: sdkmath.LegacyZeroDec(),
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perSecReward: sdkmath.LegacyNewDec(1234).Quo(sdkmath.LegacyNewDec(keeper.SecondsPerYear)),
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expectedRate: sdkmath.LegacyMustNewDecFromStr("0.999999999999987228"), // <-- for 6-decimal token, this is negligible rounding
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},
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{
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name: "rps only: 10M kava / year rewards",
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totalSupply: sdk.NewInt(870950000e6),
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totalBonded: sdkmath.NewInt(130380000e6),
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inflation: sdkmath.LegacyZeroDec(),
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communityTax: sdkmath.LegacyZeroDec(),
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perSecReward: sdkmath.LegacyMustNewDecFromStr("317097.919837645865043125"), // 10 million kava per year
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expectedRate: sdkmath.LegacyMustNewDecFromStr("0.076698880196349133"), // verified manually
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},
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{
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name: "rps only: 25M kava / year rewards",
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totalSupply: sdk.NewInt(870950000e6),
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totalBonded: sdkmath.NewInt(130380000e6),
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inflation: sdkmath.LegacyZeroDec(),
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communityTax: sdkmath.LegacyZeroDec(),
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perSecReward: sdkmath.LegacyMustNewDecFromStr("792744.799594114662607813"), // 25 million kava per year
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expectedRate: sdkmath.LegacyMustNewDecFromStr("0.191747200490872833"), // verified manually
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},
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{
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name: "rps only: too much kava / year rewards",
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totalSupply: sdk.NewInt(870950000e6),
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totalBonded: sdkmath.NewInt(130380000e6),
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inflation: sdkmath.LegacyZeroDec(),
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communityTax: sdkmath.LegacyZeroDec(),
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perSecReward: sdkmath.LegacyNewDecFromBigInt(hugeRewardsPerSec), // 2^230. a higher exponent than this overflows.
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// https://www.wolframalpha.com/input?i=%28%28365+*+24+*+3600%29+%2F+130380000e6%29+*+%282%5E230%29
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expectedRate: sdkmath.LegacyMustNewDecFromStr("417344440850566075319340506352140425426634017001007267992800590.431305795858260469"), // verified manually
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},
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{
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name: "rps only: low kava / year rewards",
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totalSupply: sdk.NewInt(870950000e6),
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totalBonded: sdkmath.NewInt(130380000e6),
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inflation: sdkmath.LegacyZeroDec(),
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communityTax: sdkmath.LegacyZeroDec(),
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perSecReward: sdkmath.LegacyMustNewDecFromStr("0.1"),
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expectedRate: sdkmath.LegacyMustNewDecFromStr("0.000000024187758858"), // verified manually, rounded would be 0.000000024187758859
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},
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{
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name: "rps only: 1 ukava / year rewards",
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totalSupply: sdk.NewInt(870950000e6),
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totalBonded: sdkmath.NewInt(130380000e6),
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inflation: sdkmath.LegacyZeroDec(),
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communityTax: sdkmath.LegacyZeroDec(),
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perSecReward: sdkmath.LegacyMustNewDecFromStr("0.000000031709791984"), // 1 ukava per year
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expectedRate: sdkmath.LegacyMustNewDecFromStr("0.000000000000007669"), // verified manually, rounded would be 0.000000000000007670
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},
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}
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for _, tc := range testCases {
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t.Run(tc.name, func(t *testing.T) {
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rewardRate := keeper.CalculateStakingAnnualPercentage(
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tc.totalSupply,
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tc.totalBonded,
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tc.inflation,
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tc.communityTax,
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tc.perSecReward)
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require.Equal(t, tc.expectedRate, rewardRate)
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})
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}
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}
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