| use anyhow::{anyhow, Error}; |
| |
| fn error() -> Error { |
| anyhow!(0).context(1).context(2).context(3) |
| } |
| |
| #[test] |
| fn test_iter() { |
| let e = error(); |
| let mut chain = e.chain(); |
| assert_eq!("3", chain.next().unwrap().to_string()); |
| assert_eq!("2", chain.next().unwrap().to_string()); |
| assert_eq!("1", chain.next().unwrap().to_string()); |
| assert_eq!("0", chain.next().unwrap().to_string()); |
| assert!(chain.next().is_none()); |
| assert!(chain.next_back().is_none()); |
| } |
| |
| #[test] |
| fn test_rev() { |
| let e = error(); |
| let mut chain = e.chain().rev(); |
| assert_eq!("0", chain.next().unwrap().to_string()); |
| assert_eq!("1", chain.next().unwrap().to_string()); |
| assert_eq!("2", chain.next().unwrap().to_string()); |
| assert_eq!("3", chain.next().unwrap().to_string()); |
| assert!(chain.next().is_none()); |
| assert!(chain.next_back().is_none()); |
| } |
| |
| #[test] |
| fn test_len() { |
| let e = error(); |
| let mut chain = e.chain(); |
| assert_eq!(4, chain.len()); |
| assert_eq!("3", chain.next().unwrap().to_string()); |
| assert_eq!(3, chain.len()); |
| assert_eq!("0", chain.next_back().unwrap().to_string()); |
| assert_eq!(2, chain.len()); |
| assert_eq!("2", chain.next().unwrap().to_string()); |
| assert_eq!(1, chain.len()); |
| assert_eq!("1", chain.next_back().unwrap().to_string()); |
| assert_eq!(0, chain.len()); |
| assert!(chain.next().is_none()); |
| } |
