fix: stop creating `data` folder when running tests (#14152) (#14157)

(cherry picked from commit 605ea666c6d04d70ab990fbb169b6f09c400e8a9)

Co-authored-by: Julien Robert <julien@rbrt.fr>

simapp/test_helpers.go

@@ -2,6 +2,8 @@ package simapp
 
 import (
 	"encoding/json"
+	"fmt"
+	"os"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -229,7 +231,13 @@ func ModuleAccountAddrs() map[string]bool {
 
 // NewTestNetworkFixture returns a new simapp AppConstructor for network simulation tests
 func NewTestNetworkFixture() network.TestFixture {
-	app := NewSimApp(log.NewNopLogger(), dbm.NewMemDB(), nil, true, simtestutil.EmptyAppOptions{})
+	dir, err := os.MkdirTemp("", "simapp")
+	if err != nil {
+		panic(fmt.Sprintf("failed creating temporary directory: %v", err))
+	}
+	defer os.RemoveAll(dir)
+
+	app := NewSimApp(log.NewNopLogger(), dbm.NewMemDB(), nil, true, simtestutil.NewAppOptionsWithFlagHome(dir))
 
 	appCtr := func(val testutil.Validator) servertypes.Application {
 		return NewSimApp(