Create config_test.go

Add basic config test

Author: wesleyylg928392839

config/config_test.go

@@ -0,0 +1,13 @@
+package config
+
+import "testing"
+
+func TestLoadDefaultConfig(t *testing.T) {
+    cfg := DefaultConfig()
+    if cfg.HTTPPort == 0 {
+        t.Fatalf("HTTPPort should be set in default config")
+    }
+    if cfg.DataDir == "" {
+        t.Fatalf("DataDir should not be empty in default config")
+    }
+}