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