| use core::error::{request_ref, request_value, Request}; |
| |
| // Test the `Request` API. |
| #[derive(Debug)] |
| struct SomeConcreteType { |
| some_string: String, |
| } |
| |
| impl std::fmt::Display for SomeConcreteType { |
| fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { |
| write!(f, "A") |
| } |
| } |
| |
| impl std::error::Error for SomeConcreteType { |
| fn provide<'a>(&'a self, request: &mut Request<'a>) { |
| request |
| .provide_ref::<String>(&self.some_string) |
| .provide_ref::<str>(&self.some_string) |
| .provide_value_with::<String>(|| "bye".to_owned()); |
| } |
| } |
| |
| // Test the Error.provide and request mechanisms with a by-reference trait object. |
| #[test] |
| fn test_error_generic_member_access() { |
| let obj = &SomeConcreteType { some_string: "hello".to_owned() }; |
| |
| assert_eq!(request_ref::<String>(&*obj).unwrap(), "hello"); |
| assert_eq!(request_value::<String>(&*obj).unwrap(), "bye"); |
| assert_eq!(request_value::<u8>(&obj), None); |
| } |
| |
| // Test the Error.provide and request mechanisms with a by-reference trait object. |
| #[test] |
| fn test_request_constructor() { |
| let obj: &dyn std::error::Error = &SomeConcreteType { some_string: "hello".to_owned() }; |
| |
| assert_eq!(request_ref::<String>(&*obj).unwrap(), "hello"); |
| assert_eq!(request_value::<String>(&*obj).unwrap(), "bye"); |
| assert_eq!(request_value::<u8>(&obj), None); |
| } |
| |
| // Test the Error.provide and request mechanisms with a boxed trait object. |
| #[test] |
| fn test_error_generic_member_access_boxed() { |
| let obj: Box<dyn std::error::Error> = |
| Box::new(SomeConcreteType { some_string: "hello".to_owned() }); |
| |
| assert_eq!(request_ref::<String>(&*obj).unwrap(), "hello"); |
| assert_eq!(request_value::<String>(&*obj).unwrap(), "bye"); |
| |
| // NOTE: Box<E> only implements Error when E: Error + Sized, which means we can't pass a |
| // Box<dyn Error> to request_value. |
| //assert_eq!(request_value::<String>(&obj).unwrap(), "bye"); |
| } |
| |
| // Test the Error.provide and request mechanisms with a concrete object. |
| #[test] |
| fn test_error_generic_member_access_concrete() { |
| let obj = SomeConcreteType { some_string: "hello".to_owned() }; |
| |
| assert_eq!(request_ref::<String>(&obj).unwrap(), "hello"); |
| assert_eq!(request_value::<String>(&obj).unwrap(), "bye"); |
| assert_eq!(request_value::<u8>(&obj), None); |
| } |