534 lines
18 KiB
Go
534 lines
18 KiB
Go
package stake
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import (
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"fmt"
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"math/rand"
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"testing"
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"github.com/stretchr/testify/assert"
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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 TestBondedRatio(t *testing.T) {
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ctx, _, keeper := createTestInput(t, false, 0)
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pool := keeper.GetPool(ctx)
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pool.TotalSupply = 3
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pool.BondedPool = 2
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// bonded pool / total supply
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require.Equal(t, pool.bondedRatio(), sdk.NewRat(2).Quo(sdk.NewRat(3)))
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pool.TotalSupply = 0
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// avoids divide-by-zero
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require.Equal(t, pool.bondedRatio(), sdk.ZeroRat)
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}
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func TestBondedShareExRate(t *testing.T) {
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ctx, _, keeper := createTestInput(t, false, 0)
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pool := keeper.GetPool(ctx)
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pool.BondedPool = 3
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pool.BondedShares = sdk.NewRat(10)
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// bonded pool / bonded shares
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require.Equal(t, pool.bondedShareExRate(), sdk.NewRat(3).Quo(sdk.NewRat(10)))
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pool.BondedShares = sdk.ZeroRat
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// avoids divide-by-zero
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require.Equal(t, pool.bondedShareExRate(), sdk.OneRat)
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}
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func TestUnbondedShareExRate(t *testing.T) {
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ctx, _, keeper := createTestInput(t, false, 0)
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pool := keeper.GetPool(ctx)
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pool.UnbondedPool = 3
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pool.UnbondedShares = sdk.NewRat(10)
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// unbonded pool / unbonded shares
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require.Equal(t, pool.unbondedShareExRate(), sdk.NewRat(3).Quo(sdk.NewRat(10)))
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pool.UnbondedShares = sdk.ZeroRat
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// avoids divide-by-zero
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require.Equal(t, pool.unbondedShareExRate(), sdk.OneRat)
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}
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func TestBondedToUnbondedPool(t *testing.T) {
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ctx, _, keeper := createTestInput(t, false, 0)
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poolA := keeper.GetPool(ctx)
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assert.Equal(t, poolA.bondedShareExRate(), sdk.OneRat)
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assert.Equal(t, poolA.unbondedShareExRate(), sdk.OneRat)
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candA := Candidate{
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Status: Bonded,
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Address: addrs[0],
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PubKey: pks[0],
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Assets: sdk.OneRat,
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Liabilities: sdk.OneRat,
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}
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poolB, candB := poolA.bondedToUnbondedPool(candA)
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// status unbonded
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assert.Equal(t, candB.Status, Unbonded)
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// same exchange rate, assets unchanged
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assert.Equal(t, candB.Assets, candA.Assets)
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// bonded pool decreased
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assert.Equal(t, poolB.BondedPool, poolA.BondedPool-candA.Assets.Evaluate())
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// unbonded pool increased
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assert.Equal(t, poolB.UnbondedPool, poolA.UnbondedPool+candA.Assets.Evaluate())
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// conservation of tokens
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assert.Equal(t, poolB.UnbondedPool+poolB.BondedPool, poolA.BondedPool+poolA.UnbondedPool)
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}
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func TestUnbonbedtoBondedPool(t *testing.T) {
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ctx, _, keeper := createTestInput(t, false, 0)
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poolA := keeper.GetPool(ctx)
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assert.Equal(t, poolA.bondedShareExRate(), sdk.OneRat)
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assert.Equal(t, poolA.unbondedShareExRate(), sdk.OneRat)
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candA := Candidate{
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Status: Bonded,
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Address: addrs[0],
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PubKey: pks[0],
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Assets: sdk.OneRat,
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Liabilities: sdk.OneRat,
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}
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candA.Status = Unbonded
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poolB, candB := poolA.unbondedToBondedPool(candA)
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// status bonded
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assert.Equal(t, candB.Status, Bonded)
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// same exchange rate, assets unchanged
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assert.Equal(t, candB.Assets, candA.Assets)
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// bonded pool increased
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assert.Equal(t, poolB.BondedPool, poolA.BondedPool+candA.Assets.Evaluate())
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// unbonded pool decreased
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assert.Equal(t, poolB.UnbondedPool, poolA.UnbondedPool-candA.Assets.Evaluate())
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// conservation of tokens
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assert.Equal(t, poolB.UnbondedPool+poolB.BondedPool, poolA.BondedPool+poolA.UnbondedPool)
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}
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func TestAddTokensBonded(t *testing.T) {
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ctx, _, keeper := createTestInput(t, false, 0)
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poolA := keeper.GetPool(ctx)
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assert.Equal(t, poolA.bondedShareExRate(), sdk.OneRat)
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poolB, sharesB := poolA.addTokensBonded(10)
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assert.Equal(t, poolB.bondedShareExRate(), sdk.OneRat)
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// correct changes to bonded shares and bonded pool
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assert.Equal(t, poolB.BondedShares, poolA.BondedShares.Add(sharesB))
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assert.Equal(t, poolB.BondedPool, poolA.BondedPool+10)
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// same number of bonded shares / tokens when exchange rate is one
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assert.Equal(t, poolB.BondedShares, sdk.NewRat(poolB.BondedPool))
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}
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func TestRemoveSharesBonded(t *testing.T) {
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ctx, _, keeper := createTestInput(t, false, 0)
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poolA := keeper.GetPool(ctx)
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assert.Equal(t, poolA.bondedShareExRate(), sdk.OneRat)
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poolB, tokensB := poolA.removeSharesBonded(sdk.NewRat(10))
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assert.Equal(t, poolB.bondedShareExRate(), sdk.OneRat)
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// correct changes to bonded shares and bonded pool
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assert.Equal(t, poolB.BondedShares, poolA.BondedShares.Sub(sdk.NewRat(10)))
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assert.Equal(t, poolB.BondedPool, poolA.BondedPool-tokensB)
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// same number of bonded shares / tokens when exchange rate is one
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assert.Equal(t, poolB.BondedShares, sdk.NewRat(poolB.BondedPool))
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}
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func TestAddTokensUnbonded(t *testing.T) {
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ctx, _, keeper := createTestInput(t, false, 0)
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poolA := keeper.GetPool(ctx)
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assert.Equal(t, poolA.unbondedShareExRate(), sdk.OneRat)
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poolB, sharesB := poolA.addTokensUnbonded(10)
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assert.Equal(t, poolB.unbondedShareExRate(), sdk.OneRat)
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// correct changes to unbonded shares and unbonded pool
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assert.Equal(t, poolB.UnbondedShares, poolA.UnbondedShares.Add(sharesB))
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assert.Equal(t, poolB.UnbondedPool, poolA.UnbondedPool+10)
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// same number of unbonded shares / tokens when exchange rate is one
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assert.Equal(t, poolB.UnbondedShares, sdk.NewRat(poolB.UnbondedPool))
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}
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func TestRemoveSharesUnbonded(t *testing.T) {
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ctx, _, keeper := createTestInput(t, false, 0)
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poolA := keeper.GetPool(ctx)
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assert.Equal(t, poolA.unbondedShareExRate(), sdk.OneRat)
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poolB, tokensB := poolA.removeSharesUnbonded(sdk.NewRat(10))
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assert.Equal(t, poolB.unbondedShareExRate(), sdk.OneRat)
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// correct changes to unbonded shares and bonded pool
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assert.Equal(t, poolB.UnbondedShares, poolA.UnbondedShares.Sub(sdk.NewRat(10)))
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assert.Equal(t, poolB.UnbondedPool, poolA.UnbondedPool-tokensB)
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// same number of unbonded shares / tokens when exchange rate is one
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assert.Equal(t, poolB.UnbondedShares, sdk.NewRat(poolB.UnbondedPool))
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}
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func TestCandidateAddTokens(t *testing.T) {
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ctx, _, keeper := createTestInput(t, false, 0)
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poolA := keeper.GetPool(ctx)
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candA := Candidate{
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Status: Bonded,
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Address: addrs[0],
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PubKey: pks[0],
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Assets: sdk.NewRat(9),
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Liabilities: sdk.NewRat(9),
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}
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poolA.BondedPool = candA.Assets.Evaluate()
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poolA.BondedShares = candA.Assets
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assert.Equal(t, candA.delegatorShareExRate(), sdk.OneRat)
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assert.Equal(t, poolA.bondedShareExRate(), sdk.OneRat)
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assert.Equal(t, poolA.unbondedShareExRate(), sdk.OneRat)
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poolB, candB, sharesB := poolA.candidateAddTokens(candA, 10)
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// shares were issued
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assert.Equal(t, sdk.NewRat(10).Mul(candA.delegatorShareExRate()), sharesB)
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// pool shares were added
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assert.Equal(t, candB.Assets, candA.Assets.Add(sdk.NewRat(10)))
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// conservation of tokens
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assert.Equal(t, poolB.BondedPool, 10+poolA.BondedPool)
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}
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func TestCandidateRemoveShares(t *testing.T) {
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ctx, _, keeper := createTestInput(t, false, 0)
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poolA := keeper.GetPool(ctx)
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candA := Candidate{
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Status: Bonded,
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Address: addrs[0],
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PubKey: pks[0],
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Assets: sdk.NewRat(9),
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Liabilities: sdk.NewRat(9),
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}
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poolA.BondedPool = candA.Assets.Evaluate()
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poolA.BondedShares = candA.Assets
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assert.Equal(t, candA.delegatorShareExRate(), sdk.OneRat)
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assert.Equal(t, poolA.bondedShareExRate(), sdk.OneRat)
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assert.Equal(t, poolA.unbondedShareExRate(), sdk.OneRat)
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poolB, candB, coinsB := poolA.candidateRemoveShares(candA, sdk.NewRat(10))
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// coins were created
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assert.Equal(t, coinsB, int64(10))
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// pool shares were removed
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assert.Equal(t, candB.Assets, candA.Assets.Sub(sdk.NewRat(10).Mul(candA.delegatorShareExRate())))
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// conservation of tokens
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assert.Equal(t, poolB.UnbondedPool+poolB.BondedPool+coinsB, poolA.UnbondedPool+poolA.BondedPool)
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// specific case from random tests
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assets := sdk.NewRat(5102)
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liabilities := sdk.NewRat(115)
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cand := Candidate{
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Status: Bonded,
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Address: addrs[0],
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PubKey: pks[0],
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Assets: assets,
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Liabilities: liabilities,
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}
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pool := Pool{
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TotalSupply: 0,
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BondedShares: sdk.NewRat(248305),
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UnbondedShares: sdk.NewRat(232147),
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BondedPool: 248305,
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UnbondedPool: 232147,
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InflationLastTime: 0,
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Inflation: sdk.NewRat(7, 100),
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}
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shares := sdk.NewRat(29)
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msg := fmt.Sprintf("candidate %s (status: %d, assets: %v, liabilities: %v, delegatorShareExRate: %v)",
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cand.Address, cand.Status, cand.Assets, cand.Liabilities, cand.delegatorShareExRate())
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msg = fmt.Sprintf("Removed %v shares from %s", shares, msg)
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newPool, _, tokens := pool.candidateRemoveShares(cand, shares)
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require.Equal(t,
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tokens+newPool.UnbondedPool+newPool.BondedPool,
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pool.BondedPool+pool.UnbondedPool,
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"Tokens were not conserved: %s", msg)
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}
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/////////////////////////////////////
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// TODO Make all random tests less obfuscated!
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// generate a random candidate
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func randomCandidate(r *rand.Rand) Candidate {
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var status CandidateStatus
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if r.Float64() < float64(0.5) {
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status = Bonded
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} else {
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status = Unbonded
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}
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assets := sdk.NewRat(int64(r.Int31n(10000)))
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liabilities := sdk.NewRat(int64(r.Int31n(10000)))
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return Candidate{
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Status: status,
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Address: addrs[0],
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PubKey: pks[0],
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Assets: assets,
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Liabilities: liabilities,
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}
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}
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// generate a random staking state
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func randomSetup(r *rand.Rand, numCandidates int) (Pool, Candidates) {
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pool := Pool{
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TotalSupply: 0,
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BondedShares: sdk.ZeroRat,
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UnbondedShares: sdk.ZeroRat,
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BondedPool: 0,
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UnbondedPool: 0,
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InflationLastTime: 0,
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Inflation: sdk.NewRat(7, 100),
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}
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candidates := make([]Candidate, numCandidates)
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for i := 0; i < numCandidates; i++ {
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candidate := randomCandidate(r)
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if candidate.Status == Bonded {
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pool.BondedShares = pool.BondedShares.Add(candidate.Assets)
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pool.BondedPool += candidate.Assets.Evaluate()
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} else if candidate.Status == Unbonded {
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pool.UnbondedShares = pool.UnbondedShares.Add(candidate.Assets)
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pool.UnbondedPool += candidate.Assets.Evaluate()
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}
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candidates[i] = candidate
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}
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return pool, candidates
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}
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// any operation that transforms staking state
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// takes in RNG instance, pool, candidate
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// returns updated pool, updated candidate, delta tokens, descriptive message
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type Operation func(r *rand.Rand, p Pool, c Candidate) (Pool, Candidate, int64, string)
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// operation: bond or unbond a candidate depending on current status
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func OpBondOrUnbond(r *rand.Rand, p Pool, cand Candidate) (Pool, Candidate, int64, string) {
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var msg string
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if cand.Status == Bonded {
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msg = fmt.Sprintf("Unbonded previously bonded candidate %s (assets: %v, liabilities: %v, delegatorShareExRate: %v)",
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cand.Address, cand.Assets, cand.Liabilities, cand.delegatorShareExRate())
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p, cand = p.bondedToUnbondedPool(cand)
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} else if cand.Status == Unbonded {
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msg = fmt.Sprintf("Bonded previously unbonded candidate %s (assets: %v, liabilities: %v, delegatorShareExRate: %v)",
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cand.Address, cand.Assets, cand.Liabilities, cand.delegatorShareExRate())
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p, cand = p.unbondedToBondedPool(cand)
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}
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return p, cand, 0, msg
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}
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// operation: add a random number of tokens to a candidate
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func OpAddTokens(r *rand.Rand, p Pool, cand Candidate) (Pool, Candidate, int64, string) {
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tokens := int64(r.Int31n(1000))
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msg := fmt.Sprintf("candidate %s (status: %d, assets: %v, liabilities: %v, delegatorShareExRate: %v)",
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cand.Address, cand.Status, cand.Assets, cand.Liabilities, cand.delegatorShareExRate())
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p, cand, _ = p.candidateAddTokens(cand, tokens)
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msg = fmt.Sprintf("Added %d tokens to %s", tokens, msg)
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return p, cand, -1 * tokens, msg // tokens are removed so for accounting must be negative
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}
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// operation: remove a random number of shares from a candidate
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func OpRemoveShares(r *rand.Rand, p Pool, cand Candidate) (Pool, Candidate, int64, string) {
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var shares sdk.Rat
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for {
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shares = sdk.NewRat(int64(r.Int31n(1000)))
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if shares.LT(cand.Liabilities) {
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break
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}
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}
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msg := fmt.Sprintf("Removed %v shares from candidate %s (status: %d, assets: %v, liabilities: %v, delegatorShareExRate: %v)",
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shares, cand.Address, cand.Status, cand.Assets, cand.Liabilities, cand.delegatorShareExRate())
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p, cand, tokens := p.candidateRemoveShares(cand, shares)
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return p, cand, tokens, msg
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}
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// pick a random staking operation
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func randomOperation(r *rand.Rand) Operation {
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operations := []Operation{
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OpBondOrUnbond,
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OpAddTokens,
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OpRemoveShares,
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}
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r.Shuffle(len(operations), func(i, j int) {
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operations[i], operations[j] = operations[j], operations[i]
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})
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return operations[0]
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}
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// ensure invariants that should always be true are true
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func assertInvariants(t *testing.T, msg string,
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pOrig Pool, cOrig Candidates, pMod Pool, cMods Candidates, tokens int64) {
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// total tokens conserved
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require.Equal(t,
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pOrig.UnbondedPool+pOrig.BondedPool,
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pMod.UnbondedPool+pMod.BondedPool+tokens,
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"Tokens not conserved - msg: %v\n, pOrig.BondedShares: %v, pOrig.UnbondedShares: %v, pMod.BondedShares: %v, pMod.UnbondedShares: %v, pOrig.UnbondedPool: %v, pOrig.BondedPool: %v, pMod.UnbondedPool: %v, pMod.BondedPool: %v, tokens: %v\n",
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msg,
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pOrig.BondedShares, pOrig.UnbondedShares,
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pMod.BondedShares, pMod.UnbondedShares,
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pOrig.UnbondedPool, pOrig.BondedPool,
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pMod.UnbondedPool, pMod.BondedPool, tokens)
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// nonnegative bonded shares
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require.False(t, pMod.BondedShares.LT(sdk.ZeroRat),
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"Negative bonded shares - msg: %v\npOrig: %#v\npMod: %#v\ntokens: %v\n",
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msg, pOrig, pMod, tokens)
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// nonnegative unbonded shares
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require.False(t, pMod.UnbondedShares.LT(sdk.ZeroRat),
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"Negative unbonded shares - msg: %v\npOrig: %#v\npMod: %#v\ntokens: %v\n",
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msg, pOrig, pMod, tokens)
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// nonnegative bonded ex rate
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require.False(t, pMod.bondedShareExRate().LT(sdk.ZeroRat),
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"Applying operation \"%s\" resulted in negative bondedShareExRate: %d",
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msg, pMod.bondedShareExRate().Evaluate())
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// nonnegative unbonded ex rate
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require.False(t, pMod.unbondedShareExRate().LT(sdk.ZeroRat),
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"Applying operation \"%s\" resulted in negative unbondedShareExRate: %d",
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msg, pMod.unbondedShareExRate().Evaluate())
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for _, cMod := range cMods {
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// nonnegative ex rate
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require.False(t, cMod.delegatorShareExRate().LT(sdk.ZeroRat),
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"Applying operation \"%s\" resulted in negative candidate.delegatorShareExRate(): %v (candidate.Address: %s)",
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msg,
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cMod.delegatorShareExRate(),
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cMod.Address,
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)
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// nonnegative assets
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require.False(t, cMod.Assets.LT(sdk.ZeroRat),
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"Applying operation \"%s\" resulted in negative candidate.Assets: %v (candidate.Liabilities: %v, candidate.delegatorShareExRate: %v, candidate.Address: %s)",
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msg,
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cMod.Assets,
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cMod.Liabilities,
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cMod.delegatorShareExRate(),
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cMod.Address,
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)
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// nonnegative liabilities
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require.False(t, cMod.Liabilities.LT(sdk.ZeroRat),
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"Applying operation \"%s\" resulted in negative candidate.Liabilities: %v (candidate.Assets: %v, candidate.delegatorShareExRate: %v, candidate.Address: %s)",
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msg,
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cMod.Liabilities,
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cMod.Assets,
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cMod.delegatorShareExRate(),
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cMod.Address,
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)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
// TODO Re-enable once the overflow bug is fixed!
|
|
// ref https://github.com/cosmos/cosmos-sdk/issues/753
|
|
/*
|
|
func TestPossibleOverflow(t *testing.T) {
|
|
assets := sdk.NewRat(2159)
|
|
liabilities := sdk.NewRat(391432570689183511).Quo(sdk.NewRat(40113011844664))
|
|
cand := Candidate{
|
|
Status: Bonded,
|
|
Address: addrs[0],
|
|
PubKey: pks[0],
|
|
Assets: assets,
|
|
Liabilities: liabilities,
|
|
}
|
|
pool := Pool{
|
|
TotalSupply: 0,
|
|
BondedShares: assets,
|
|
UnbondedShares: sdk.ZeroRat,
|
|
BondedPool: assets.Evaluate(),
|
|
UnbondedPool: 0,
|
|
InflationLastTime: 0,
|
|
Inflation: sdk.NewRat(7, 100),
|
|
}
|
|
tokens := int64(71)
|
|
msg := fmt.Sprintf("candidate %s (status: %d, assets: %v, liabilities: %v, delegatorShareExRate: %v)",
|
|
cand.Address, cand.Status, cand.Assets, cand.Liabilities, cand.delegatorShareExRate())
|
|
_, newCandidate, _ := pool.candidateAddTokens(cand, tokens)
|
|
|
|
msg = fmt.Sprintf("Added %d tokens to %s", tokens, msg)
|
|
require.False(t, newCandidate.delegatorShareExRate().LT(sdk.ZeroRat),
|
|
"Applying operation \"%s\" resulted in negative delegatorShareExRate(): %v",
|
|
msg, newCandidate.delegatorShareExRate())
|
|
}
|
|
*/
|
|
|
|
// run random operations in a random order on a random single-candidate state, assert invariants hold
|
|
func TestSingleCandidateIntegrationInvariants(t *testing.T) {
|
|
r := rand.New(rand.NewSource(41))
|
|
|
|
for i := 0; i < 10; i++ {
|
|
poolOrig, candidatesOrig := randomSetup(r, 1)
|
|
require.Equal(t, 1, len(candidatesOrig))
|
|
|
|
// sanity check
|
|
assertInvariants(t, "no operation",
|
|
poolOrig, candidatesOrig,
|
|
poolOrig, candidatesOrig, 0)
|
|
|
|
// TODO Increase iteration count once overflow bug is fixed
|
|
// ref https://github.com/cosmos/cosmos-sdk/issues/753
|
|
for j := 0; j < 4; j++ {
|
|
poolMod, candidateMod, tokens, msg := randomOperation(r)(r, poolOrig, candidatesOrig[0])
|
|
|
|
candidatesMod := make([]Candidate, len(candidatesOrig))
|
|
copy(candidatesMod[:], candidatesOrig[:])
|
|
require.Equal(t, 1, len(candidatesOrig), "j %v", j)
|
|
require.Equal(t, 1, len(candidatesMod), "j %v", j)
|
|
candidatesMod[0] = candidateMod
|
|
|
|
assertInvariants(t, msg,
|
|
poolOrig, candidatesOrig,
|
|
poolMod, candidatesMod, tokens)
|
|
|
|
poolOrig = poolMod
|
|
candidatesOrig = candidatesMod
|
|
}
|
|
}
|
|
}
|
|
|
|
// run random operations in a random order on a random multi-candidate state, assert invariants hold
|
|
func TestMultiCandidateIntegrationInvariants(t *testing.T) {
|
|
r := rand.New(rand.NewSource(42))
|
|
|
|
for i := 0; i < 10; i++ {
|
|
poolOrig, candidatesOrig := randomSetup(r, 100)
|
|
|
|
assertInvariants(t, "no operation",
|
|
poolOrig, candidatesOrig,
|
|
poolOrig, candidatesOrig, 0)
|
|
|
|
// TODO Increase iteration count once overflow bug is fixed
|
|
// ref https://github.com/cosmos/cosmos-sdk/issues/753
|
|
for j := 0; j < 3; j++ {
|
|
index := int(r.Int31n(int32(len(candidatesOrig))))
|
|
poolMod, candidateMod, tokens, msg := randomOperation(r)(r, poolOrig, candidatesOrig[index])
|
|
candidatesMod := make([]Candidate, len(candidatesOrig))
|
|
copy(candidatesMod[:], candidatesOrig[:])
|
|
candidatesMod[index] = candidateMod
|
|
|
|
assertInvariants(t, msg,
|
|
poolOrig, candidatesOrig,
|
|
poolMod, candidatesMod, tokens)
|
|
|
|
poolOrig = poolMod
|
|
candidatesOrig = candidatesMod
|
|
|
|
}
|
|
}
|
|
}
|