imp, ci: address pending issues from EVM simulation (#1063)

* add note

fix note

* add TestAppStateFn TestRandomAccounts

* marshal int slice to json

* add paramschange for enableCreate and enableCall

* AppStateFn -> StateFn

* add TestDecodeStore

* update github actions to run evm simulation

* add TestParamChanges

* add TestRandomizedGenState

* use go install for runsim

* resolve conflict

* use random gasCap to estimate gas

* use estimateGas to calculate max transferableAmount

* update godoc

* TestAppStateFn -> TestStateFn

* Update x/evm/simulation/genesis.go

* comment

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>
Co-authored-by: Federico Kunze Küllmer <federico.kunze94@gmail.com>

app/utils.go

@@ -108,7 +108,7 @@ func RandomAccounts(r *rand.Rand, n int) []simtypes.Account {
 
 		prv := secp256k1.GenPrivKeyFromSecret(privkeySeed)
 		ethPrv := &ethsecp256k1.PrivKey{}
-		_ = ethPrv.UnmarshalAmino(prv.Bytes())
+		_ = ethPrv.UnmarshalAmino(prv.Bytes()) // UnmarshalAmino simply copies the bytes and assigns them to ethPrv.Key
 		accs[i].PrivKey = ethPrv
 		accs[i].PubKey = accs[i].PrivKey.PubKey()
 		accs[i].Address = sdk.AccAddress(accs[i].PubKey.Address())

app/utils_test.go

@@ -1,7 +1,9 @@
 package app
 
 import (
+	"encoding/json"
 	"math/rand"
+	"os"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -11,7 +13,10 @@ import (
 	authkeeper "github.com/cosmos/cosmos-sdk/x/auth/keeper"
 	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
 	paramstypes "github.com/cosmos/cosmos-sdk/x/params/types"
+	stakingtypes "github.com/cosmos/cosmos-sdk/x/staking/types"
+	evmtypes "github.com/tharsis/ethermint/x/evm/types"
 
+	"github.com/tharsis/ethermint/crypto/ethsecp256k1"
 	ethermint "github.com/tharsis/ethermint/types"
 
 	"github.com/cosmos/cosmos-sdk/simapp"
@@ -53,3 +58,54 @@ func TestRandomGenesisAccounts(t *testing.T) {
 		require.True(t, ok)
 	}
 }
+
+func TestStateFn(t *testing.T) {
+	config, db, dir, logger, skip, err := simapp.SetupSimulation("leveldb-app-sim", "Simulation")
+	if skip {
+		t.Skip("skipping AppStateFn testing")
+	}
+	require.NoError(t, err, "simulation setup failed")
+
+	config.ChainID = SimAppChainID
+	config.Commit = true
+
+	defer func() {
+		db.Close()
+		require.NoError(t, os.RemoveAll(dir))
+	}()
+
+	app := NewEthermintApp(logger, db, nil, true, map[int64]bool{}, DefaultNodeHome, simapp.FlagPeriodValue, MakeEncodingConfig(), simapp.EmptyAppOptions{}, fauxMerkleModeOpt)
+	require.Equal(t, appName, app.Name())
+
+	appStateFn := StateFn(app.AppCodec(), app.SimulationManager())
+	r := rand.New(rand.NewSource(seed))
+	accounts := RandomAccounts(r, rand.Intn(maxTestingAccounts))
+	appState, _, _, _ := appStateFn(r, accounts, config)
+
+	rawState := make(map[string]json.RawMessage)
+	err = json.Unmarshal(appState, &rawState)
+	require.NoError(t, err)
+
+	stakingStateBz, ok := rawState[stakingtypes.ModuleName]
+	require.True(t, ok)
+
+	stakingState := new(stakingtypes.GenesisState)
+	app.AppCodec().MustUnmarshalJSON(stakingStateBz, stakingState)
+	bondDenom := stakingState.Params.BondDenom
+
+	evmStateBz, ok := rawState[evmtypes.ModuleName]
+	require.True(t, ok)
+
+	evmState := new(evmtypes.GenesisState)
+	app.AppCodec().MustUnmarshalJSON(evmStateBz, evmState)
+	require.Equal(t, bondDenom, evmState.Params.EvmDenom)
+}
+
+func TestRandomAccounts(t *testing.T) {
+	r := rand.New(rand.NewSource(seed))
+	accounts := RandomAccounts(r, rand.Intn(maxTestingAccounts))
+	for _, acc := range accounts {
+		_, ok := acc.PrivKey.(*ethsecp256k1.PrivKey)
+		require.True(t, ok)
+	}
+}