massive refactoring against json config parsing

proxy/socks/config_json_test.go

@@ -0,0 +1,22 @@
+// +build json
+
+package socks_test
+
+import (
+	"testing"
+
+	"github.com/v2ray/v2ray-core/proxy/internal/config"
+	"github.com/v2ray/v2ray-core/proxy/socks"
+	v2testing "github.com/v2ray/v2ray-core/testing"
+	"github.com/v2ray/v2ray-core/testing/assert"
+)
+
+func TestDefaultIPAddress(t *testing.T) {
+	v2testing.Current(t)
+
+	socksConfig, err := config.CreateInboundConnectionConfig("socks", []byte(`{
+    "auth": "noauth"
+  }`))
+	assert.Error(err).IsNil()
+	assert.String(socksConfig.(*socks.Config).Address).Equals("127.0.0.1")
+}