Add endpoint to get information for a theme

Signed-off-by: trivernis <trivernis@protonmail.com>

src/client.rs

@@ -1,6 +1,6 @@
 use crate::error::ApiResult;
 use crate::models::{
-    Anime, AnimeSynonym, Artist, Image, Resource, SearchResponse, Series, Song, ThemeEntry,
+    Anime, AnimeSynonym, Artist, Image, Resource, SearchResponse, Series, Song, Theme, ThemeEntry,
 };
 use reqwest::Response;
 use serde::de::DeserializeOwned;
@@ -112,6 +112,11 @@ impl AnimeThemesClient {
         self.entry_by_id_with_include("synonym", id, include).await
     }
 
+    /// Returns a theme by id
+    pub async fn theme(&self, id: u32, include: &[&str]) -> ApiResult<Theme> {
+        self.entry_by_id_with_include("theme", id, include).await
+    }
+
     /// Generic endpoint with the format /<endpoint>/<id> returning the type on the json field <endpoint>
     async fn entry_by_id_with_include<T: DeserializeOwned, I: Display>(
         &self,

src/models.rs

@@ -50,6 +50,8 @@ pub struct Theme {
     pub group: String,
     pub slug: String,
     pub song: Option<Song>,
+    pub anime: Option<Anime>,
+    pub entries: Option<Vec<ThemeEntry>>,
 }
 
 #[derive(Debug, Clone, Deserialize)]

src/tests/test_client.rs

@@ -83,3 +83,11 @@ async fn it_returns_songs_by_id() {
 
     assert!(result.themes.is_some())
 }
+
+#[tokio::test]
+async fn it_returns_themes_by_id() {
+    let client = AnimeThemesClient::default();
+    let result = client.theme(8187, &["entries"]).await.unwrap();
+
+    assert!(result.entries.is_some())
+}