@@ -188,3 +188,3 @@
 FROSTFS_TRACING_ENDPOINT="localhost"
-FROSTFS_TRACING_EXPORTER="otlp_grpc"
+FROSTFS_TRACING_EXPORTER="otlp_grpc"

@@ -37,2 +33,2 @@
-	var cfgFile *os.File
-	cfgFile, err = os.Open(fileName)
+func mergeConfig(v *viper.Viper, fileName string) error {
+	cv := viper.New()

@@ -0,0 +10,4 @@
+)
+
+func TestConfigDir(t *testing.T) {
+	dir, err := os.MkdirTemp("", "")

@@ -0,0 +16,4 @@
+	cfgFileName0 := path.Join(dir, "cfg_00.json")
+	cfgFileName1 := path.Join(dir, "cfg_01.yml")
+
+	cfgFile, err := os.Create(cfgFileName0)

@@ -0,0 +41,4 @@
+
+	os.Clearenv() // ENVs have priority over config files, so we do this in tests
+
+	return New(p,

@@ -0,0 +39,4 @@
+func fromDir(dir string) *Config {
+	var p Prm
+
+	os.Clearenv() // ENVs have priority over config files, so we do this in tests

@@ -0,0 +15,4 @@
+	cfgFileName0 := path.Join(dir, "cfg_00.json")
+	cfgFileName1 := path.Join(dir, "cfg_01.yml")
+
+	require.NoError(t, os.WriteFile(cfgFileName0, []byte("{\n  \"storage\": {\n    \"shard_pool_size\": 15\n  }\n}"), 0777))

@@ -20,4 +21,2 @@
 			continue
 		}
-		ext := path.Ext(entry.Name())
-		if ext != ".yaml" && ext != ".yml" {