Refactoring, tests.

cmd/rosetta/config.go

@@ -8,6 +8,14 @@ import (
 	"github.com/multiversx/mx-chain-rosetta/server/resources"
 )
 
+func decideCustomCurrencies(configFileCustomCurrencies string) ([]resources.Currency, error) {
+	if len(configFileCustomCurrencies) == 0 {
+		return make([]resources.Currency, 0), nil
+	}
+
+	return loadConfigOfCustomCurrencies(configFileCustomCurrencies)
+}
+
 func loadConfigOfCustomCurrencies(configFile string) ([]resources.Currency, error) {
 	fileContent, err := os.ReadFile(configFile)
 	if err != nil {

cmd/rosetta/config_test.go

@@ -7,6 +7,20 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
+func TestDecideCustomCurrencies(t *testing.T) {
+	t.Run("with success (file provided)", func(t *testing.T) {
+		customCurrencies, err := decideCustomCurrencies("testdata/custom-currencies.json")
+		require.NoError(t, err)
+		require.Len(t, customCurrencies, 2)
+	})
+
+	t.Run("with success (file not provided)", func(t *testing.T) {
+		customCurrencies, err := decideCustomCurrencies("")
+		require.NoError(t, err)
+		require.Empty(t, customCurrencies)
+	})
+}
+
 func TestLoadConfigOfCustomCurrencies(t *testing.T) {
 	t.Run("with success", func(t *testing.T) {
 		customCurrencies, err := loadConfigOfCustomCurrencies("testdata/custom-currencies.json")

cmd/rosetta/main.go

@@ -10,7 +10,6 @@ import (
 
 	"github.com/coinbase/rosetta-sdk-go/server"
 	"github.com/multiversx/mx-chain-rosetta/server/factory"
-	"github.com/multiversx/mx-chain-rosetta/server/resources"
 	"github.com/multiversx/mx-chain-rosetta/version"
 	"github.com/urfave/cli"
 )
@@ -124,14 +123,6 @@ func startRosetta(ctx *cli.Context) error {
 	return nil
 }
 
-func decideCustomCurrencies(configFileCustomCurrencies string) ([]resources.Currency, error) {
-	if len(configFileCustomCurrencies) == 0 {
-		return make([]resources.Currency, 0), nil
-	}
-
-	return loadConfigOfCustomCurrencies(configFileCustomCurrencies)
-}
-
 func createHttpServer(port int, routers ...server.Router) (*http.Server, error) {
 	router := server.NewRouter(
 		routers...,