upd(sam tests): use namsral flag

sam/repository/main_test.go

@@ -1,24 +1,32 @@
 package repository
 
 import (
-	"flag"
+	"github.com/namsral/flag"
 	"github.com/joho/godotenv"
-	_ "github.com/joho/godotenv"
 	"github.com/titpetric/factory"
 	"os"
 	"testing"
 )
 
 func TestMain(m *testing.M) {
+	// @todo this is a very optimistic initialization, make it more robust
+	godotenv.Load("../../.env")
+
+	prefix := "sam"
+	dsn := ""
+
+	p := func(s string) string {
+		return prefix + "-" + s
+	}
+
+	flag.StringVar(&dsn, p("db-dsn"), "crust:crust@tcp(db1:3306)/crust?collation=utf8mb4_general_ci", "DSN for database connection")
 	flag.Parse()
 
 	if testing.Short() {
 		return
 	}
 
-	// @todo this is a very optimistic initialization, make it more robust
-	godotenv.Load("../../.env")
-	factory.Database.Add("default", os.Getenv("SAM_DB_DSN"))
+	factory.Database.Add("default", dsn)
 	factory.Database.MustGet().Profiler = &factory.Database.ProfilerStdout
 
 	os.Exit(m.Run())