make test pass with --all-features

src/lib.rs

@@ -49,6 +49,7 @@
 //! }
 //!
 //! if let Err(e) = func1() {
+//! #   #[cfg(not(feature = "no-debug-cause"))]
 //!     #[cfg(not(windows))]
 //!     assert_eq!(
 //!         format!("\n{:?}\n", e),
@@ -143,6 +144,7 @@
 //!         eprintln!("\nThe root cause was: std::io::Error: {:#?}", io_error);
 //!     }
 //!
+//! #   #[cfg(not(feature = "no-debug-cause"))]
 //!     #[cfg(not(windows))]
 //!     assert_eq!(
 //!         format!("\n{:?}\n", e),
@@ -848,6 +850,7 @@ macro_rules! cherr {
 /// }
 ///
 /// #     if let Err(e) = func1() {
+/// #         #[cfg(not(feature = "no-debug-cause"))]
 /// #         #[cfg(not(windows))]
 /// #         assert_eq!(
 /// #             format!("\n{:?}\n", e), r#"

tests/test_iter.rs

@@ -1,10 +1,11 @@
 use chainerror::*;
 use std::error::Error;
-use std::fmt::Write;
 use std::io;
 
+#[cfg(not(feature = "display-cause"))]
 #[test]
 fn test_iter() -> Result<(), Box<dyn Error + Send + Sync>> {
+    use std::fmt::Write;
     let err = io::Error::from(io::ErrorKind::NotFound);
     let err = cherr!(err, "1");
     let err = cherr!(err, "2");
@@ -30,6 +31,31 @@ fn test_iter() -> Result<(), Box<dyn Error + Send + Sync>> {
     Ok(())
 }
 
+#[cfg(feature = "display-cause")]
+#[test]
+fn test_iter() -> Result<(), Box<dyn Error + Send + Sync>> {
+    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 res = err.to_string();
+
+    assert_eq!(res, "6\nCaused by:\n5\nCaused by:\n4\nCaused by:\n3\nCaused by:\n2\nCaused by:\n1\nCaused by:\nentity 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<dyn Error + Send + Sync>> {
     let err = io::Error::from(io::ErrorKind::NotFound);