Refactor slightly

src/library.rs

@@ -10,13 +10,17 @@ pub struct Library {
 }
 
 impl Library {
-    pub fn find_covers(&self) -> HashSet<&Song> {
+    fn all_covers(&self) -> HashSet<&Song> {
         self.artists
             .iter()
             .fold(HashSet::new(), |mut covers, artist| {
                 covers.extend(artist.covered_songs());
                 covers
             })
+    }
+
+    pub fn find_library_covers(&self) -> HashSet<&Song> {
+        self.all_covers()
             .into_iter()
             .filter(|song| song.is_library_cover(self))
             .collect()
@@ -171,6 +175,11 @@ mod tests {
                     performer: "Bon Iver".to_string(),
                     writers: ["Justin Vernon".to_string()].into(),
                 },
+                Song {
+                    title: "The Times They Are A-Changin'".to_string(),
+                    performer: "Bon Iver".to_string(),
+                    writers: ["Bob Dylan".to_string()].into(),
+                },
             ]
             .into(),
         }
@@ -189,12 +198,12 @@ mod tests {
 
     #[test]
     fn test_covered_songs_no_covers() {
-        assert!(bon_iver().covered_songs().is_empty())
+        assert!(ts().covered_songs().is_empty())
     }
 
     #[test]
     fn test_find_covers() {
-        assert!(library().find_covers() == HashSet::from([&love_story("black midi")]))
+        assert!(library().find_library_covers() == HashSet::from([&love_story("black midi")]))
     }
 
     #[test]
@@ -202,7 +211,7 @@ mod tests {
         assert!(Library {
             artists: [bon_iver()].into()
         }
-        .find_covers()
+        .find_library_covers()
         .is_empty())
     }
 }

src/main.rs

@@ -10,7 +10,7 @@ fn main() {
     let json = fs::read_to_string(file_path).expect("Failed to open library file");
     let library: library::Library =
         DeJson::deserialize_json(&json).expect("Failed to deserialize library file");
-    for cover in library.find_covers() {
+    for cover in library.find_library_covers() {
         println!("Found cover!");
         println!(
             "{}, by {:?}, covered by {}",