54 lines
1.8 KiB
Go
54 lines
1.8 KiB
Go
package mint
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import (
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"testing"
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"github.com/stretchr/testify/require"
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sdk "github.com/cosmos/cosmos-sdk/types"
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)
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func TestNextInflation(t *testing.T) {
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minter := InitialMinter()
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params := DefaultParams()
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// Governing Mechanism:
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// inflationRateChangePerYear = (1- BondedRatio/ GoalBonded) * MaxInflationRateChange
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tests := []struct {
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bondedRatio, setInflation, expChange sdk.Dec
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}{
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// with 0% bonded atom supply the inflation should increase by InflationRateChange
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{sdk.ZeroDec(), sdk.NewDecWithPrec(7, 2), params.InflationRateChange.Quo(hrsPerYr)},
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// 100% bonded, starting at 20% inflation and being reduced
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// (1 - (1/0.67))*(0.13/8667)
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{sdk.OneDec(), sdk.NewDecWithPrec(20, 2),
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sdk.OneDec().Sub(sdk.OneDec().Quo(params.GoalBonded)).Mul(params.InflationRateChange).Quo(hrsPerYr)},
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// 50% bonded, starting at 10% inflation and being increased
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{sdk.NewDecWithPrec(5, 1), sdk.NewDecWithPrec(10, 2),
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sdk.OneDec().Sub(sdk.NewDecWithPrec(5, 1).Quo(params.GoalBonded)).Mul(params.InflationRateChange).Quo(hrsPerYr)},
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// test 7% minimum stop (testing with 100% bonded)
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{sdk.OneDec(), sdk.NewDecWithPrec(7, 2), sdk.ZeroDec()},
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{sdk.OneDec(), sdk.NewDecWithPrec(70001, 6), sdk.NewDecWithPrec(-1, 6)},
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// test 20% maximum stop (testing with 0% bonded)
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{sdk.ZeroDec(), sdk.NewDecWithPrec(20, 2), sdk.ZeroDec()},
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{sdk.ZeroDec(), sdk.NewDecWithPrec(199999, 6), sdk.NewDecWithPrec(1, 6)},
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// perfect balance shouldn't change inflation
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{sdk.NewDecWithPrec(67, 2), sdk.NewDecWithPrec(15, 2), sdk.ZeroDec()},
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}
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for i, tc := range tests {
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minter.Inflation = tc.setInflation
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inflation := minter.NextInflation(params, tc.bondedRatio)
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diffInflation := inflation.Sub(tc.setInflation)
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require.True(t, diffInflation.Equal(tc.expChange),
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"Test Index: %v\nDiff: %v\nExpected: %v\n", i, diffInflation, tc.expChange)
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}
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}
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