146 lines
6.2 KiB
Go
146 lines
6.2 KiB
Go
package types
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import (
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"math/rand"
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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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//changing the int in NewSource will allow you to test different, deterministic, sets of operations
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var r = rand.New(rand.NewSource(6595))
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func TestGetInflation(t *testing.T) {
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pool := InitialPool()
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params := DefaultParams()
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// Governing Mechanism:
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// BondedRatio = BondedTokens / TotalSupply
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// inflationRateChangePerYear = (1- BondedRatio/ GoalBonded) * MaxInflationRateChange
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tests := []struct {
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name string
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setBondedTokens, setLooseTokens,
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setInflation, expectedChange 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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{"test 1", sdk.ZeroDec(), sdk.ZeroDec(), sdk.NewDecWithPrec(7, 2), params.InflationRateChange.Quo(hrsPerYrDec)},
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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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{"test 2", sdk.OneDec(), sdk.ZeroDec(), sdk.NewDecWithPrec(20, 2),
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sdk.OneDec().Sub(sdk.OneDec().Quo(params.GoalBonded)).Mul(params.InflationRateChange).Quo(hrsPerYrDec)},
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// 50% bonded, starting at 10% inflation and being increased
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{"test 3", sdk.OneDec(), sdk.OneDec(), sdk.NewDecWithPrec(10, 2),
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sdk.OneDec().Sub(sdk.NewDecWithPrec(5, 1).Quo(params.GoalBonded)).Mul(params.InflationRateChange).Quo(hrsPerYrDec)},
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// test 7% minimum stop (testing with 100% bonded)
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{"test 4", sdk.OneDec(), sdk.ZeroDec(), sdk.NewDecWithPrec(7, 2), sdk.ZeroDec()},
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{"test 5", sdk.OneDec(), sdk.ZeroDec(), sdk.NewDecWithPrec(70001, 6), sdk.NewDecWithPrec(-1, 6)},
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// test 20% maximum stop (testing with 0% bonded)
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{"test 6", sdk.ZeroDec(), sdk.ZeroDec(), sdk.NewDecWithPrec(20, 2), sdk.ZeroDec()},
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{"test 7", sdk.ZeroDec(), sdk.ZeroDec(), sdk.NewDecWithPrec(199999, 6), sdk.NewDecWithPrec(1, 6)},
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// perfect balance shouldn't change inflation
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{"test 8", sdk.NewDec(67), sdk.NewDec(33), sdk.NewDecWithPrec(15, 2), sdk.ZeroDec()},
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}
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for _, tc := range tests {
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pool.BondedTokens, pool.LooseTokens = tc.setBondedTokens, tc.setLooseTokens
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pool.Inflation = tc.setInflation
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inflation := pool.NextInflation(params)
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diffInflation := inflation.Sub(tc.setInflation)
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require.True(t, diffInflation.Equal(tc.expectedChange),
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"Name: %v\nDiff: %v\nExpected: %v\n", tc.name, diffInflation, tc.expectedChange)
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}
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}
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// Test that provisions are correctly added to the pool and validators each hour for 1 year
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func TestProcessProvisions(t *testing.T) {
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pool := InitialPool()
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params := DefaultParams()
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var (
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initialTotalTokens int64 = 550000000
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cumulativeExpProvs = sdk.ZeroDec()
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)
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pool.LooseTokens = sdk.NewDec(initialTotalTokens)
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// process the provisions for a year
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for hr := 0; hr < 100; hr++ {
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var expProvisions sdk.Dec
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_, expProvisions, pool = updateProvisions(t, pool, params, hr)
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cumulativeExpProvs = cumulativeExpProvs.Add(expProvisions)
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}
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//get the pool and do the final value checks from checkFinalPoolValues
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checkFinalPoolValues(t, pool, sdk.NewDec(initialTotalTokens), cumulativeExpProvs)
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}
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//_________________________________________________________________________________________
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////////////////////////////////HELPER FUNCTIONS BELOW/////////////////////////////////////
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// Final check on the global pool values for what the total tokens accumulated from each hour of provisions
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func checkFinalPoolValues(t *testing.T, pool Pool, initialTotalTokens, cumulativeExpProvs sdk.Dec) {
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calculatedTotalTokens := initialTotalTokens.Add(cumulativeExpProvs)
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require.True(sdk.DecEq(t, calculatedTotalTokens, pool.TokenSupply()))
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}
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// Processes provisions are added to the pool correctly every hour
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// Returns expected Provisions, expected Inflation, and pool, to help with cumulative calculations back in main Tests
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func updateProvisions(t *testing.T, pool Pool, params Params, hr int) (sdk.Dec, sdk.Dec, Pool) {
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expInflation := pool.NextInflation(params)
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expProvisions := expInflation.Mul(pool.TokenSupply()).Quo(hrsPerYrDec)
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startTotalSupply := pool.TokenSupply()
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pool = pool.ProcessProvisions(params)
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//check provisions were added to pool
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require.True(sdk.DecEq(t, startTotalSupply.Add(expProvisions), pool.TokenSupply()))
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return expInflation, expProvisions, pool
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}
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// Checks that The inflation will correctly increase or decrease after an update to the pool
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func checkInflation(t *testing.T, pool Pool, previousInflation, updatedInflation sdk.Dec, msg string) {
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inflationChange := updatedInflation.Sub(previousInflation)
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switch {
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//BELOW 67% - Rate of change positive and increasing, while we are between 7% <= and < 20% inflation
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case pool.BondedRatio().LT(sdk.NewDecWithPrec(67, 2)) && updatedInflation.LT(sdk.NewDecWithPrec(20, 2)):
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require.Equal(t, true, inflationChange.GT(sdk.ZeroDec()), msg)
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//BELOW 67% - Rate of change should be 0 while inflation continually stays at 20% until we reach 67% bonded ratio
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case pool.BondedRatio().LT(sdk.NewDecWithPrec(67, 2)) && updatedInflation.Equal(sdk.NewDecWithPrec(20, 2)):
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if previousInflation.Equal(sdk.NewDecWithPrec(20, 2)) {
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require.Equal(t, true, inflationChange.IsZero(), msg)
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//This else statement covers the one off case where we first hit 20%, but we still needed a positive ROC to get to 67% bonded ratio (i.e. we went from 19.99999% to 20%)
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} else {
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require.Equal(t, true, inflationChange.GT(sdk.ZeroDec()), msg)
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}
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//ABOVE 67% - Rate of change should be negative while the bond is above 67, and should stay negative until we reach inflation of 7%
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case pool.BondedRatio().GT(sdk.NewDecWithPrec(67, 2)) &&
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updatedInflation.LT(sdk.NewDecWithPrec(20, 2)) && updatedInflation.GT(sdk.NewDecWithPrec(7, 2)):
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require.Equal(t, true, inflationChange.LT(sdk.ZeroDec()), msg)
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//ABOVE 67% - Rate of change should be 0 while inflation continually stays at 7%.
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case pool.BondedRatio().GT(sdk.NewDecWithPrec(67, 2)) &&
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updatedInflation.Equal(sdk.NewDecWithPrec(7, 2)):
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if previousInflation.Equal(sdk.NewDecWithPrec(7, 2)) {
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require.Equal(t, true, inflationChange.IsZero(), msg)
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//This else statement covers the one off case where we first hit 7%, but we still needed a negative ROC to continue to get down to 67%. (i.e. we went from 7.00001% to 7%)
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} else {
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require.Equal(t, true, inflationChange.LT(sdk.ZeroDec()), msg)
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}
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}
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}
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