#[macro_use] extern crate optional_struct; #[derive(OptionalStruct)] #[optional_name = "Woof"] struct Config { delay: Option, path: String, percentage: f32, } #[test] fn test_apply_options() { let mut config = Config { delay: Some(2), path: "/var/log/foo.log".to_owned(), percentage: 3.12, }; let opt_config = Woof { delay: None, path: Some("/tmp/bar.log".to_owned()), percentage: Some(42.24), }; config.apply_options(opt_config); assert_eq!(config.delay, None); assert_eq!(config.path, "/tmp/bar.log"); assert_eq!(config.percentage, 42.24); }