79 lines
1.9 KiB
Rust
79 lines
1.9 KiB
Rust
use anyhow::anyhow;
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use std::error::Error as _;
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use std::io;
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use thiserror::Error;
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#[test]
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fn test_transparent_struct() {
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#[derive(Error, Debug)]
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#[error(transparent)]
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struct Error(ErrorKind);
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#[derive(Error, Debug)]
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enum ErrorKind {
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#[error("E0")]
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E0,
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#[error("E1")]
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E1(#[from] io::Error),
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}
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let error = Error(ErrorKind::E0);
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assert_eq!("E0", error.to_string());
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assert!(error.source().is_none());
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let io = io::Error::new(io::ErrorKind::Other, "oh no!");
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let error = Error(ErrorKind::from(io));
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assert_eq!("E1", error.to_string());
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error.source().unwrap().downcast_ref::<io::Error>().unwrap();
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}
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#[test]
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fn test_transparent_enum() {
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#[derive(Error, Debug)]
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enum Error {
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#[error("this failed")]
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This,
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#[error(transparent)]
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Other(anyhow::Error),
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}
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let error = Error::This;
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assert_eq!("this failed", error.to_string());
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let error = Error::Other(anyhow!("inner").context("outer"));
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assert_eq!("outer", error.to_string());
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assert_eq!("inner", error.source().unwrap().to_string());
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}
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#[test]
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fn test_anyhow() {
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#[derive(Error, Debug)]
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#[error(transparent)]
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struct Any(#[from] anyhow::Error);
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let error = Any::from(anyhow!("inner").context("outer"));
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assert_eq!("outer", error.to_string());
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assert_eq!("inner", error.source().unwrap().to_string());
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}
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#[test]
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fn test_non_static() {
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#[derive(Error, Debug)]
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#[error(transparent)]
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struct Error<'a> {
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inner: ErrorKind<'a>,
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}
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#[derive(Error, Debug)]
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enum ErrorKind<'a> {
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#[error("unexpected token: {:?}", token)]
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Unexpected { token: &'a str },
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}
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let error = Error {
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inner: ErrorKind::Unexpected { token: "error" },
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};
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assert_eq!("unexpected token: \"error\"", error.to_string());
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assert!(error.source().is_none());
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}
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