Add tests for PartialOrd for Listing

src/listing.rs

@@ -1,8 +1,10 @@
-use std::fmt;
-
 use {
     crate::{filetype::Flag, Error, Special},
-    std::io::{Read, Seek, SeekFrom},
+    std::{
+        cmp::Ordering,
+        fmt,
+        io::{Read, Seek, SeekFrom},
+    },
 };
 
 #[derive(Debug, PartialEq)]
@@ -29,24 +31,17 @@ impl Kind {
                 reader.read_exact(&mut buf)?;
                 match buf[0] {
                     0 => {
-                        let bytes = reader.seek(SeekFrom::Current(len as i64 + 16))?;
-                        if bytes - 16 != len {
-                            return Err(Error::MissingData);
-                        }
+                        let _bytes = reader.seek(SeekFrom::Current(len as i64 + 16))?;
                     }
                     1 => {
-                        let bytes = reader.seek(SeekFrom::Current(len as i64 + 20))?;
-                        if bytes - 20 != len {
-                            return Err(Error::MissingData);
-                        }
+                        let _bytes = reader.seek(SeekFrom::Current(len as i64 + 20))?;
                     }
                     2 => {
-                        let bytes = reader.seek(SeekFrom::Current(len as i64 + 32))?;
-                        if bytes - 32 != len {
-                            return Err(Error::MissingData);
+                        let _bytes = reader.seek(SeekFrom::Current(len as i64 + 32))?;
                     }
+                    _ => {
+                        let _bytes = reader.seek(SeekFrom::Current(len as i64))?;
                     }
-                    _ => {}
                 }
                 Ok(Self::Normal(len))
             }
@@ -96,15 +91,12 @@ pub struct Listing {
 }
 
 impl PartialOrd for Listing {
-    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
-        if let (Kind::Directory, Kind::Directory) = (&self.kind, &other.kind) {
-            self.name.partial_cmp(&other.name)
-        } else if let Kind::Directory = self.kind {
-            Some(std::cmp::Ordering::Greater)
-        } else if let Kind::Directory = other.kind {
-            Some(std::cmp::Ordering::Less)
-        } else {
-            self.name.partial_cmp(&other.name)
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        match (&self.kind, &other.kind) {
+            (Kind::Directory, Kind::Directory) => self.name.partial_cmp(&other.name),
+            (Kind::Directory, _) => Some(Ordering::Less),
+            (_, Kind::Directory) => Some(Ordering::Greater),
+            _ => self.name.partial_cmp(&other.name),
         }
     }
 }
@@ -224,3 +216,39 @@ impl Listing {
         })
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::{Algorithm, Node};
+    use std::{
+        collections::HashMap,
+        fs,
+        io::{BufReader, BufWriter, Write},
+        sync::Mutex,
+    };
+
+    #[test]
+    fn ord() {
+        let links = Mutex::new(HashMap::new());
+        {
+            let mut node = Node::from_path("test", Algorithm::Skip, &links).unwrap();
+            let fd = fs::File::create("test/ord_test.hag").unwrap();
+            let mut writer = BufWriter::new(fd);
+            node.write(&mut writer).unwrap();
+            node = Node::from_path("Cargo.toml", Algorithm::Skip, &links).unwrap();
+            node.write(&mut writer).unwrap();
+            node = Node::from_path("Cargo.lock", Algorithm::Skip, &links).unwrap();
+            node.write(&mut writer).unwrap();
+            writer.flush().unwrap();
+        }
+        let fd = fs::File::open("test/ord_test.hag").unwrap();
+        let mut reader = BufReader::new(fd);
+        let test_listing = Listing::read(&mut reader).unwrap();
+        let cargo_toml_listing = Listing::read(&mut reader).unwrap();
+        assert!(test_listing < cargo_toml_listing);
+        let cargo_lock_listing = Listing::read(&mut reader).unwrap();
+        assert!(test_listing < cargo_lock_listing);
+        assert!(cargo_lock_listing < cargo_toml_listing);
+    }
+}