feat(meta): substitute TBA for unnamed episodes

crates/arr-meta/tests/tmdb.rs

@@ -7,7 +7,7 @@ use {reqwest as _, serde as _, serde_json as _, thiserror as _, tracing as _};
 
 use std::time::Duration;
 
-use arr_meta::{Error, TmdbClient};
+use arr_meta::{Error, TmdbClient, UNTITLED_EPISODE};
 use chrono::NaiveDate;
 use wiremock::matchers::{header_exists, method, path, query_param};
 use wiremock::{Mock, MockServer, ResponseTemplate};
@@ -464,6 +464,33 @@ async fn debug_output_does_not_leak_the_api_key() {
     assert!(rendered.contains("redacted"), "{rendered}");
 }
 
+/// TMDB leaves an unaired episode's name as `""`. It must not reach the
+/// library as an empty string — search haystacks, §7.4 filenames and the
+/// compat shim all treat it as real text (#153) — so it becomes a placeholder
+/// that a later refresh replaces once TMDB names it.
+#[tokio::test]
+async fn season_episode_without_a_name_gets_the_placeholder_title() {
+    let server = MockServer::start().await;
+    Mock::given(method("GET"))
+        .and(path("/3/tv/82728/season/1"))
+        .respond_with(ResponseTemplate::new(200).set_body_string(
+            r#"{"season_number": 1, "episodes": [
+                {"episode_number": 1, "name": "Magic Xylophone", "air_date": "2018-10-01"},
+                {"episode_number": 2, "name": "", "air_date": null}
+            ]}"#,
+        ))
+        .mount(&server)
+        .await;
+
+    let season = client(&server)
+        .season(82_728, 1)
+        .await
+        .expect("lookup succeeds");
+
+    assert_eq!(season.episodes[0].title, "Magic Xylophone");
+    assert_eq!(season.episodes[1].title, UNTITLED_EPISODE);
+}
+
 /// §6.1: `t=tvsearch` is addressed by TVDB id, and `/tv/{id}/external_ids` is
 /// where TMDB keeps the mapping.
 #[tokio::test]