Add more unit tests

backend/internal/test/suite.go

@@ -1,7 +1,10 @@
 package test
 
 import (
+	"npm/internal/config"
 	"npm/internal/database"
+	"strings"
+	"testing"
 
 	"github.com/DATA-DOG/go-sqlmock"
 	"gorm.io/driver/postgres"
@@ -21,3 +24,18 @@ func Setup() (sqlmock.Sqlmock, error) {
 	database.SetDB(gormDB)
 	return mock, err
 }
+
+func InitConfig(t *testing.T, envs ...string) {
+	if len(envs) > 0 {
+		for _, env := range envs {
+			parts := strings.Split(env, "=")
+			if len(parts) == 2 {
+				t.Setenv(parts[0], parts[1])
+			}
+		}
+	}
+
+	version := "999.999.999"
+	commit := "abcd123"
+	config.Init(&version, &commit)
+}