Port SnapshotDir tests to use insta snapshots

src/path_serializer.rs

@@ -25,12 +25,12 @@
 //! }
 //! ```
 //!
-//! **The methods in this module can only handle relative paths, since absolute
-//! paths are never portable.**
+//! For absolute paths, which are only safe to serialize if they're artificial,
+//! use `serialize_absolute`.
 
 use std::path::{Component, Path};
 
-use serde::Serializer;
+use serde::{ser::SerializeSeq, Serialize, Serializer};
 
 pub fn serialize_option<S, T>(maybe_path: &Option<T>, serializer: S) -> Result<S::Ok, S::Error>
 where
@@ -72,3 +72,35 @@ where
 
     serializer.serialize_str(&output)
 }
+
+pub fn serialize_absolute<S, T>(path: T, serializer: S) -> Result<S::Ok, S::Error>
+where
+    S: Serializer,
+    T: AsRef<Path>,
+{
+    let as_str = path
+        .as_ref()
+        .as_os_str()
+        .to_str()
+        .expect("Invalid Unicode in file path, cannot serialize");
+    let replaced = as_str.replace("\\", "/");
+
+    serializer.serialize_str(&replaced)
+}
+
+#[derive(Serialize)]
+struct WithAbsolute<'a>(#[serde(serialize_with = "serialize_absolute")] &'a Path);
+
+pub fn serialize_vec_absolute<S, T>(paths: &Vec<T>, serializer: S) -> Result<S::Ok, S::Error>
+where
+    S: Serializer,
+    T: AsRef<Path>,
+{
+    let mut seq = serializer.serialize_seq(Some(paths.len()))?;
+
+    for path in paths {
+        seq.serialize_element(&WithAbsolute(path.as_ref()))?;
+    }
+
+    seq.end()
+}