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x/slashing/simulation/genesis.go: add unit tests (cosmos#6696)
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* x/slashing/simulation/genesis.go: add unit tests

* rename variable stakingGenesis to slashingGenesis

Co-authored-by: Alexander Bezobchuk <[email protected]>
Co-authored-by: Marko <[email protected]>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
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4 people authored Jul 13, 2020
1 parent 1caf917 commit f5c274f
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80 changes: 80 additions & 0 deletions x/slashing/simulation/genesis_test.go
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package simulation_test

import (
"encoding/json"
"math/rand"
"testing"
"time"

"github.com/stretchr/testify/require"

"github.com/cosmos/cosmos-sdk/codec"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/types/module"
simtypes "github.com/cosmos/cosmos-sdk/types/simulation"
"github.com/cosmos/cosmos-sdk/x/slashing/simulation"
"github.com/cosmos/cosmos-sdk/x/slashing/types"
)

// TestRandomizedGenState tests the normal scenario of applying RandomizedGenState.
// Abonormal scenarios are not tested here.
func TestRandomizedGenState(t *testing.T) {
cdc := codec.New()
s := rand.NewSource(1)
r := rand.New(s)

simState := module.SimulationState{
AppParams: make(simtypes.AppParams),
Cdc: cdc,
Rand: r,
NumBonded: 3,
Accounts: simtypes.RandomAccounts(r, 3),
InitialStake: 1000,
GenState: make(map[string]json.RawMessage),
}

simulation.RandomizedGenState(&simState)

var slashingGenesis types.GenesisState
simState.Cdc.MustUnmarshalJSON(simState.GenState[types.ModuleName], &slashingGenesis)

dec1, _ := sdk.NewDecFromStr("0.600000000000000000")
dec2, _ := sdk.NewDecFromStr("0.022222222222222222")
dec3, _ := sdk.NewDecFromStr("0.008928571428571429")

require.Equal(t, dec1, slashingGenesis.Params.MinSignedPerWindow)
require.Equal(t, dec2, slashingGenesis.Params.SlashFractionDoubleSign)
require.Equal(t, dec3, slashingGenesis.Params.SlashFractionDowntime)
require.Equal(t, int64(720), slashingGenesis.Params.SignedBlocksWindow)
require.Equal(t, time.Duration(34800000000000), slashingGenesis.Params.DowntimeJailDuration)
require.Len(t, slashingGenesis.MissedBlocks, 0)
require.Len(t, slashingGenesis.SigningInfos, 0)

}

// TestRandomizedGenState tests abnormal scenarios of applying RandomizedGenState.
func TestRandomizedGenState1(t *testing.T) {
cdc := codec.New()

s := rand.NewSource(1)
r := rand.New(s)

// all these tests will panic
tests := []struct {
simState module.SimulationState
panicMsg string
}{
{ // panic => reason: incomplete initialization of the simState
module.SimulationState{}, "invalid memory address or nil pointer dereference"},
{ // panic => reason: incomplete initialization of the simState
module.SimulationState{
AppParams: make(simtypes.AppParams),
Cdc: cdc,
Rand: r,
}, "assignment to entry in nil map"},
}

for _, tt := range tests {
require.Panicsf(t, func() { simulation.RandomizedGenState(&tt.simState) }, tt.panicMsg)
}
}

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