add simulation stubs to make tests pass (#408)

app/app.go

@@ -334,6 +334,7 @@ func NewApp(logger log.Logger, db dbm.DB, traceStore io.Writer, loadLatest bool,
 		cdp.NewAppModule(app.cdpKeeper, app.pricefeedKeeper, app.supplyKeeper), // TODO how is the order be decided here? Is this order correct?
 		pricefeed.NewAppModule(app.pricefeedKeeper),
 		auction.NewAppModule(app.auctionKeeper, app.supplyKeeper),
+		bep3.NewAppModule(app.bep3Keeper, app.supplyKeeper),
 		kavadist.NewAppModule(app.kavadistKeeper, app.supplyKeeper),
 	)
 

x/bep3/module.go

@@ -2,22 +2,26 @@ package bep3
 
 import (
 	"encoding/json"
+	"math/rand"
 
 	"github.com/cosmos/cosmos-sdk/client/context"
 	"github.com/cosmos/cosmos-sdk/codec"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/types/module"
+	sim "github.com/cosmos/cosmos-sdk/x/simulation"
 	"github.com/gorilla/mux"
 	"github.com/spf13/cobra"
 	abci "github.com/tendermint/tendermint/abci/types"
 
 	"github.com/kava-labs/kava/x/bep3/client/cli"
 	"github.com/kava-labs/kava/x/bep3/client/rest"
+	"github.com/kava-labs/kava/x/bep3/simulation"
 )
 
 var (
-	_ module.AppModule      = AppModule{}
-	_ module.AppModuleBasic = AppModuleBasic{}
+	_ module.AppModule           = AppModule{}
+	_ module.AppModuleBasic      = AppModuleBasic{}
+	_ module.AppModuleSimulation = AppModuleSimulation{}
 )
 
 // AppModuleBasic defines the basic application module used by the bep3 module.
@@ -64,9 +68,32 @@ func (AppModuleBasic) GetQueryCmd(cdc *codec.Codec) *cobra.Command {
 	return cli.GetQueryCmd(StoreKey, cdc)
 }
 
+//____________________________________________________________________________
+
+// AppModuleSimulation defines the module simulation functions used by the auction module.
+type AppModuleSimulation struct{}
+
+// RegisterStoreDecoder registers a decoder for auction module's types
+func (AppModuleSimulation) RegisterStoreDecoder(sdr sdk.StoreDecoderRegistry) {
+	sdr[StoreKey] = simulation.DecodeStore
+}
+
+// GenerateGenesisState creates a randomized GenState of the auction module
+func (AppModuleSimulation) GenerateGenesisState(simState *module.SimulationState) {
+	simulation.RandomizedGenState(simState)
+}
+
+// RandomizedParams creates randomized auction param changes for the simulator.
+func (AppModuleSimulation) RandomizedParams(r *rand.Rand) []sim.ParamChange {
+	return simulation.ParamChanges(r)
+}
+
+//____________________________________________________________________________
+
 // AppModule implements the sdk.AppModule interface.
 type AppModule struct {
 	AppModuleBasic
+	AppModuleSimulation
 
 	keeper       Keeper
 	supplyKeeper SupplyKeeper

x/bep3/simulation/decoder.go

@@ -0,0 +1,12 @@
+package simulation
+
+import (
+	"github.com/cosmos/cosmos-sdk/codec"
+	cmn "github.com/tendermint/tendermint/libs/common"
+)
+
+// DecodeStore unmarshals the KVPair's Value to the module's corresponding type
+func DecodeStore(cdc *codec.Codec, kvA, kvB cmn.KVPair) string {
+	// TODO implement this
+	return ""
+}

x/bep3/simulation/genesis.go

@@ -0,0 +1,22 @@
+package simulation
+
+import (
+	"fmt"
+
+	"github.com/cosmos/cosmos-sdk/codec"
+	"github.com/cosmos/cosmos-sdk/types/module"
+
+	"github.com/kava-labs/kava/x/bep3/types"
+)
+
+// RandomizedGenState generates a random GenesisState
+func RandomizedGenState(simState *module.SimulationState) {
+
+	// TODO implement this fully
+	// - randomly generating the genesis params
+	// - overwriting with genesis provided to simulation
+	genesisState := types.DefaultGenesisState()
+
+	fmt.Printf("Selected randomly generated %s parameters:\n%s\n", types.ModuleName, codec.MustMarshalJSONIndent(simState.Cdc, genesisState))
+	simState.GenState[types.ModuleName] = simState.Cdc.MustMarshalJSON(genesisState)
+}

x/bep3/simulation/params.go

@@ -0,0 +1,14 @@
+package simulation
+
+import (
+	"math/rand"
+
+	"github.com/cosmos/cosmos-sdk/x/simulation"
+)
+
+// ParamChanges defines the parameters that can be modified by param change proposals
+// on the simulation
+func ParamChanges(r *rand.Rand) []simulation.ParamChange {
+	// TODO implement this
+	return []simulation.ParamChange{}
+}