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add ChainError Iterator

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This commit is contained in:
Harald Hoyer 2019-01-25 13:53:30 +01:00
parent 49515b86f9
commit d14af67560
2 changed files with 91 additions and 27 deletions
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66
tests/test_iter.rs Normal file
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@ -0,0 +1,66 @@
use chainerror::*;
use std::error::Error;
use std::fmt::Write;
use std::io;
#[test]
fn test_iter() -> Result<(), Box<Error>> {
let err = io::Error::from(io::ErrorKind::NotFound);
let err = cherr!(err, "1");
let err = cherr!(err, "2");
let err = cherr!(err, "3");
let err = cherr!(err, "4");
let err = cherr!(err, "5");
let err = cherr!(err, "6");
let mut res = String::new();
for e in err.iter() {
write!(res, "{}", e.to_string())?;
}
assert_eq!(res, "654321entity not found");
let io_error: Option<&io::Error> = err
.iter()
.filter_map(Error::downcast_ref::<io::Error>)
.next();
assert_eq!(io_error.unwrap().kind(), io::ErrorKind::NotFound);
Ok(())
}
#[test]
fn test_find_cause() -> Result<(), Box<Error>> {
let err = io::Error::from(io::ErrorKind::NotFound);
let err = cherr!(err, "1");
let err = cherr!(err, "2");
let err = cherr!(err, "3");
let err = cherr!(err, "4");
let err = cherr!(err, "5");
let err = cherr!(err, "6");
let io_error: Option<&io::Error> = err.find_cause::<io::Error>();
assert_eq!(io_error.unwrap().kind(), io::ErrorKind::NotFound);
Ok(())
}
#[test]
fn test_root_cause() -> Result<(), Box<Error>> {
let err = io::Error::from(io::ErrorKind::NotFound);
let err = cherr!(err, "1");
let err = cherr!(err, "2");
let err = cherr!(err, "3");
let err = cherr!(err, "4");
let err = cherr!(err, "5");
let err = cherr!(err, "6");
let err: Option<&(dyn std::error::Error + 'static)> = err.root_cause();
let io_error: Option<&io::Error> = err.and_then(Error::downcast_ref::<io::Error>);
assert_eq!(io_error.unwrap().kind(), io::ErrorKind::NotFound);
Ok(())
}