补充测试用例

internal/infra/config/config.go

@@ -127,17 +127,3 @@ func (c *Config) Load(path string) error {
 
 	return nil
 }
-
-// GetDatabaseConnectionString 获取数据库连接字符串
-func (c *Config) GetDatabaseConnectionString() string {
-	// 构建PostgreSQL连接字符串
-	return fmt.Sprintf(
-		"user=%s password=%s dbname=%s host=%s port=%d sslmode=%s",
-		c.Database.Username,
-		c.Database.Password,
-		c.Database.DBName,
-		c.Database.Host,
-		c.Database.Port,
-		c.Database.SSLMode,
-	)
-}