Ensure snapshots formatted with rustfmt use unix newlines

CHANGELOG.md

@@ -6,6 +6,7 @@ All notable changes to insta and cargo-insta are documented here.
 
 - Added `allow_duplicates!` to enable multiple assertions for a
   single snapshot. (#346)
+- Ensure that expressions formatted with `rustfmt` use unix newlines.
 
 ## 1.27.0
 

src/utils.rs

@@ -100,7 +100,7 @@ pub fn format_rust_expression(value: &str) -> Cow<'_, str> {
                 let end = output.stdout.len() - SUFFIX.len();
                 return std::str::from_utf8(&output.stdout[start..end])
                     .unwrap()
-                    .to_owned()
+                    .replace("\r\n", "\n")
                     .into();
             }
         }