Refactor test assertions and improve code formatting

- Simplified test assertions in `fs_snapshot.rs` and `ref_properties.rs` for better readability by removing unnecessary line breaks.
- Enhanced the formatting of code in `rojo_ref.rs` to maintain consistency and improve clarity.

These changes improve the overall readability and maintainability of the test code and related implementations.

src/rojo_ref.rs

@@ -329,9 +329,7 @@ impl RefPathIndex {
                     continue;
                 }
                 if let Ok(bytes) = std::fs::read(&path) {
-                    if let Ok(val) =
+                    if let Ok(val) = crate::json::from_slice::<serde_json::Value>(&bytes) {
-                        crate::json::from_slice::<serde_json::Value>(&bytes)
-                    {
                         if let Some(attrs) = val.get("attributes").and_then(|a| a.as_object()) {
                             for (key, value) in attrs {
                                 if key.starts_with(crate::REF_PATH_ATTRIBUTE_PREFIX) {

src/syncback/fs_snapshot.rs

@@ -744,9 +744,7 @@ mod tests {
             "Attachment1 wrong. Got:\n{result}"
         );
         assert!(
-            result.contains(
+            result.contains(r#""Rojo_Ref_PrimaryPart": "Workspace/Model/Handle.model.json5""#),
-                r#""Rojo_Ref_PrimaryPart": "Workspace/Model/Handle.model.json5""#
-            ),
             "PrimaryPart wrong. Got:\n{result}"
         );
     }

src/syncback/ref_properties.rs

@@ -435,8 +435,10 @@ mod tests {
 
         let mut attachments = Vec::new();
         for _ in 0..4 {
-            let att =
+            let att = dom.insert(
-                dom.insert(container, InstanceBuilder::new("Attachment").with_name("001"));
+                container,
+                InstanceBuilder::new("Attachment").with_name("001"),
+            );
             attachments.push(att);
         }
 
@@ -489,12 +491,12 @@ mod tests {
 
         let links = collect_referents(&dom2, &HashMap::new(), None);
 
-        let placeholders: Vec<&String> = links
+        let placeholders: Vec<&String> = links.placeholder_to_target.keys().collect();
-            .placeholder_to_target
-            .keys()
-            .collect();
 
-        assert!(placeholders.len() >= 2, "should have at least 2 placeholders");
+        assert!(
+            placeholders.len() >= 2,
+            "should have at least 2 placeholders"
+        );
 
         let targets: HashSet<&Ref> = links.placeholder_to_target.values().collect();
         assert!(