Test new database error

src/database/json/mod.rs

@@ -67,7 +67,7 @@ mod tests {
 
     use super::*;
 
-    use crate::{tests::COLLECTION, Artist, ArtistId, Format};
+    use crate::{tests::COLLECTION, Artist, ArtistId, Format, Collection};
 
     fn artist_to_json(artist: &Artist) -> String {
         let album_artist = &artist.id.name;
@@ -186,7 +186,18 @@ mod tests {
     }
 
     #[test]
-    fn errors() {
+    fn load_errors() {
+        let json = String::from("");
+        let serde_err = serde_json::from_str::<Collection>(&json);
+        assert!(serde_err.is_err());
+
+        let serde_err: LoadError = serde_err.unwrap_err().into();
+        assert!(!serde_err.to_string().is_empty());
+        assert!(!format!("{:?}", serde_err).is_empty());
+    }
+
+    #[test]
+    fn save_errors() {
         let mut object = HashMap::<ArtistId, String>::new();
         object.insert(
             ArtistId {