src/external/musicbrainz/api/browse.rs

@@ -109,8 +109,8 @@ mod tests {
         collection::album::{AlbumPrimaryType, AlbumSecondaryType},
         external::musicbrainz::{
             api::{
-                SerdeAlbumDate, SerdeAlbumPrimaryType, SerdeAlbumSecondaryType, SerdeMbid,
-                MB_MAX_PAGE_LIMIT,
+                tests::next_page_test, SerdeAlbumDate, SerdeAlbumPrimaryType,
+                SerdeAlbumSecondaryType, SerdeMbid, MB_MAX_PAGE_LIMIT,
             },
             MockIMusicBrainzHttp,
         },
@@ -118,6 +118,16 @@ mod tests {
 
     use super::*;
 
+    #[test]
+    fn browse_release_group_next_page() {
+        let page = BrowseReleaseGroupPage {
+            release_group_offset: 5,
+            release_group_count: 45,
+        };
+
+        next_page_test(|val| page.next_page_offset(val));
+    }
+
     #[test]
     fn browse_release_group() {
         let mbid = "00000000-0000-0000-0000-000000000000";

src/external/musicbrainz/api/mod.rs

@@ -84,6 +84,7 @@ impl PageSettings {
     }
 }
 
+#[derive(Debug, PartialEq, Eq)]
 pub enum NextPage {
     Offset(usize),
     Complete,
@@ -358,6 +359,25 @@ mod tests {
         assert!(!format!("{unk_err:?}").is_empty());
     }
 
+    pub fn next_page_test<Fn>(mut f: Fn)
+    where
+        Fn: FnMut(usize) -> NextPage,
+    {
+        let next = f(20);
+        assert_eq!(next, NextPage::Offset(25));
+
+        let next = f(40);
+        assert_eq!(next, NextPage::Complete);
+
+        let next = f(100);
+        assert_eq!(next, NextPage::Complete);
+    }
+
+    #[test]
+    fn next_page() {
+        next_page_test(|val| NextPage::next_page_offset(5, 45, val));
+    }
+
     #[test]
     fn format_page_settings() {
         let paging = PageSettings::default();

src/external/musicbrainz/api/search/mod.rs

@@ -64,3 +64,20 @@ impl<Http: IMusicBrainzHttp> MusicBrainzClient<Http> {
     impl_search_entity!(Artist, "artist");
     impl_search_entity!(ReleaseGroup, "release-group");
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::external::musicbrainz::api::tests::next_page_test;
+
+    use super::*;
+
+    #[test]
+    fn search_next_page() {
+        let page = SearchPage {
+            offset: 5,
+            count: 45,
+        };
+
+        next_page_test(|val| page.next_page_offset(val));
+    }
+}