test: move application tests to tests/

test_support/test_helpers -> tests/support; watched_at unified w/ domain test_watched_at (2024-03-15).
Kept inline: users::diary_filter tests (feed_sort_to_direction_all_variants, paged_user_filter_builds_correctly) - pub(super) helpers in private module.
Dropped stale never-compiled users/tests/get_users.rs (old execute signature).

crates/application/tests/diary/get_movie_social_page_test.rs

@@ -0,0 +1,64 @@
+use domain::testing::test_movie_with_year;
+use std::sync::Arc;
+
+use uuid::Uuid;
+
+use domain::{
+    ports::MovieCommand,
+    testing::{FakeDiaryQuery, InMemoryStore},
+};
+
+use application::{
+    diary::deps::GetMovieSocialPageDeps, diary::get_movie_social_page,
+    diary::queries::GetMovieSocialPageQuery,
+};
+
+#[tokio::test]
+async fn fails_when_movie_not_found() {
+    let deps = GetMovieSocialPageDeps {
+        movie_query: InMemoryStore::new(),
+        diary: FakeDiaryQuery::new() as _,
+        movie_profile: InMemoryStore::new(),
+    };
+
+    let result = get_movie_social_page::execute(
+        &deps,
+        GetMovieSocialPageQuery {
+            movie_id: Uuid::new_v4(),
+            limit: 10,
+            offset: 0,
+        },
+    )
+    .await;
+
+    assert!(result.is_err());
+}
+
+#[tokio::test]
+async fn returns_movie_social_page() {
+    let movies = InMemoryStore::new();
+
+    let movie = test_movie_with_year("Social Movie", 2024);
+    let movie_uuid = movie.id().value();
+    movies.upsert_movie(&movie).await.unwrap();
+
+    let deps = GetMovieSocialPageDeps {
+        movie_query: Arc::clone(&movies) as _,
+        diary: FakeDiaryQuery::new() as _,
+        movie_profile: InMemoryStore::new(),
+    };
+
+    let result = get_movie_social_page::execute(
+        &deps,
+        GetMovieSocialPageQuery {
+            movie_id: movie_uuid,
+            limit: 10,
+            offset: 0,
+        },
+    )
+    .await
+    .unwrap();
+
+    assert_eq!(result.movie.title().value(), "Social Movie");
+    assert_eq!(result.reviews.items.len(), 0);
+}