Vendor things

third-party/vendor/eyre/tests/test_chain.rs

@@ -0,0 +1,54 @@
+mod common;
+
+use self::common::maybe_install_handler;
+use eyre::{eyre, Report};
+
+fn error() -> Report {
+    eyre!({ 0 }).wrap_err(1).wrap_err(2).wrap_err(3)
+}
+
+#[test]
+fn test_iter() {
+    maybe_install_handler().unwrap();
+
+    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() {
+    maybe_install_handler().unwrap();
+
+    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() {
+    maybe_install_handler().unwrap();
+
+    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());
+}