diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..28ca5ca
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1 @@
+pub mod library;
diff --git a/src/library.rs b/src/library.rs
index 17914da..6bff014 100644
--- a/src/library.rs
+++ b/src/library.rs
@@ -1,15 +1,22 @@
-use nanoserde::DeJson;
 use std::{
     collections::HashSet,
     hash::{Hash, Hasher},
 };
 
+use nanoserde::DeJson;
+
 #[derive(Debug, Clone, DeJson)]
 pub struct Library {
     artists: HashSet<Artist>,
 }
 
 impl Library {
+    pub fn new(artists: impl IntoIterator<Item = Artist>) -> Library {
+        Library {
+            artists: artists.into_iter().collect(),
+        }
+    }
+
     fn all_covers(&self) -> HashSet<&Song> {
         self.artists
             .iter()
@@ -28,7 +35,7 @@ impl Library {
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, DeJson)]
-struct Artist {
+pub struct Artist {
     name: String,
     members: HashSet<String>,
     catalog: HashSet<Song>,
@@ -41,6 +48,18 @@ impl Hash for Artist {
 }
 
 impl Artist {
+    pub fn new(
+        name: String,
+        members: impl IntoIterator<Item = String>,
+        catalog: impl IntoIterator<Item = Song>,
+    ) -> Artist {
+        Artist {
+            name,
+            members: members.into_iter().collect(),
+            catalog: catalog.into_iter().collect(),
+        }
+    }
+
     fn covered_songs(&self) -> HashSet<&Song> {
         self.catalog
             .iter()
@@ -64,6 +83,18 @@ impl Hash for Song {
 }
 
 impl Song {
+    pub fn new(
+        title: String,
+        performer: String,
+        writers: impl IntoIterator<Item = String>,
+    ) -> Song {
+        Song {
+            title,
+            performer,
+            writers: writers.into_iter().collect(),
+        }
+    }
+
     fn is_library_cover(&self, library: &Library) -> bool {
         library
             .artists
@@ -187,13 +218,13 @@ mod tests {
 
     fn library() -> Library {
         Library {
-            artists: HashSet::from([bm(), ts(), bon_iver()]),
+            artists: [bm(), ts(), bon_iver()].into(),
         }
     }
 
     #[test]
     fn test_covered_songs() {
-        assert!(bm().covered_songs() == HashSet::from([&love_story("black midi"), &schizoid_man()]))
+        assert!(bm().covered_songs() == [&love_story("black midi"), &schizoid_man()].into())
     }
 
     #[test]
@@ -203,7 +234,7 @@ mod tests {
 
     #[test]
     fn test_find_covers() {
-        assert!(library().find_library_covers() == HashSet::from([&love_story("black midi")]))
+        assert!(library().find_library_covers() == [&love_story("black midi")].into())
     }
 
     #[test]
diff --git a/src/main.rs b/src/main.rs
index 1ff82a5..9e87683 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,14 +1,15 @@
-use nanoserde::DeJson;
 use std::{env, fs};
 
-mod library;
+use nanoserde::DeJson;
+
+use cover::library::Library;
 
 fn main() {
     let file_path = env::args()
         .nth(1)
         .expect("Usage: cover path/to/library.json");
     let json = fs::read_to_string(file_path).expect("Failed to open library file");
-    let library: library::Library =
+    let library: Library =
         DeJson::deserialize_json(&json).expect("Failed to deserialize library file");
     for cover in library.find_library_covers() {
         println!("Found cover!");