From 058e3981c5cfb91c0fb5861018a262ef5a17d2a9 Mon Sep 17 00:00:00 2001
From: rhuairahrighairigh <ruaridh.odonnell@gmail.com>
Date: Sun, 29 Mar 2020 20:50:32 +0100
Subject: [PATCH] add simulation stubs to make tests pass

---
 x/committee/module.go             | 40 ++++++++++++++++---------------
 x/committee/simulation/decoder.go | 12 ++++++++++
 x/committee/simulation/genesis.go | 22 +++++++++++++++++
 x/committee/simulation/params.go  | 14 +++++++++++
 4 files changed, 69 insertions(+), 19 deletions(-)
 create mode 100644 x/committee/simulation/decoder.go
 create mode 100644 x/committee/simulation/genesis.go
 create mode 100644 x/committee/simulation/params.go

diff --git a/x/committee/module.go b/x/committee/module.go
index 12e95b56..f39e8c44 100644
--- a/x/committee/module.go
+++ b/x/committee/module.go
@@ -2,6 +2,7 @@ package committee
 
 import (
 	"encoding/json"
+	"math/rand"
 
 	"github.com/gorilla/mux"
 	"github.com/spf13/cobra"
@@ -10,16 +11,18 @@ import (
 	"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"
 	abci "github.com/tendermint/tendermint/abci/types"
 
 	"github.com/kava-labs/kava/x/committee/client/cli"
 	"github.com/kava-labs/kava/x/committee/client/rest"
+	"github.com/kava-labs/kava/x/committee/simulation"
 )
 
 var (
-	_ module.AppModule      = AppModule{}
-	_ module.AppModuleBasic = AppModuleBasic{}
-	// TODO_ module.AppModuleSimulation = AppModuleSimulation{}
+	_ module.AppModule           = AppModule{}
+	_ module.AppModuleBasic      = AppModuleBasic{}
+	_ module.AppModuleSimulation = AppModuleSimulation{}
 )
 
 // AppModuleBasic app module basics object
@@ -67,31 +70,30 @@ func (AppModuleBasic) GetQueryCmd(cdc *codec.Codec) *cobra.Command {
 
 //____________________________________________________________________________
 
-// TODO
-// // AppModuleSimulation defines the module simulation functions used by the module.
-// type AppModuleSimulation struct{}
+// AppModuleSimulation defines the module simulation functions used by the module.
+type AppModuleSimulation struct{}
 
-// // RegisterStoreDecoder registers a decoder for the module's types
-// func (AppModuleSimulation) RegisterStoreDecoder(sdr sdk.StoreDecoderRegistry) {
-// 	sdr[StoreKey] = simulation.DecodeStore
-// }
+// RegisterStoreDecoder registers a decoder for the module's types
+func (AppModuleSimulation) RegisterStoreDecoder(sdr sdk.StoreDecoderRegistry) {
+	sdr[StoreKey] = simulation.DecodeStore
+}
 
-// // GenerateGenesisState creates a randomized GenState of the module
-// func (AppModuleSimulation) GenerateGenesisState(simState *module.SimulationState) {
-// 	simulation.RandomizedGenState(simState)
-// }
+// GenerateGenesisState creates a randomized GenState of the module
+func (AppModuleSimulation) GenerateGenesisState(simState *module.SimulationState) {
+	simulation.RandomizedGenState(simState)
+}
 
-// // RandomizedParams creates randomized param changes for the simulator.
-// func (AppModuleSimulation) RandomizedParams(r *rand.Rand) []sim.ParamChange {
-// 	return simulation.ParamChanges(r)
-// }
+// RandomizedParams creates randomized param changes for the simulator.
+func (AppModuleSimulation) RandomizedParams(r *rand.Rand) []sim.ParamChange {
+	return simulation.ParamChanges(r)
+}
 
 //____________________________________________________________________________
 
 // AppModule app module type
 type AppModule struct {
 	AppModuleBasic
-	// TODO AppModuleSimulation
+	AppModuleSimulation
 
 	keeper Keeper
 }
diff --git a/x/committee/simulation/decoder.go b/x/committee/simulation/decoder.go
new file mode 100644
index 00000000..2cdd439b
--- /dev/null
+++ b/x/committee/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 corresponding module type
+func DecodeStore(cdc *codec.Codec, kvA, kvB cmn.KVPair) string {
+	// TODO implement this
+	return ""
+}
diff --git a/x/committee/simulation/genesis.go b/x/committee/simulation/genesis.go
new file mode 100644
index 00000000..5f11ea53
--- /dev/null
+++ b/x/committee/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/auction/types"
+)
+
+// RandomizedGenState generates a random GenesisState for the module
+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)
+}
diff --git a/x/committee/simulation/params.go b/x/committee/simulation/params.go
new file mode 100644
index 00000000..8c1f7aff
--- /dev/null
+++ b/x/committee/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{}
+}