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/users/get_page_viewer_test.rs

@@ -0,0 +1,54 @@
+use crate::support::register_command;
+use domain::value_objects::{Email, FollowTarget, SocialIdentity, UserId};
+
+use crate::support::TestContextBuilder;
+use application::auth::deps::RegisterDeps;
+use application::auth::register;
+use application::users::deps::GetPageViewerDeps;
+use application::users::get_page_viewer;
+
+async fn setup_user(b: &TestContextBuilder, email: &str, username: &str) -> uuid::Uuid {
+    let deps = RegisterDeps {
+        user: b.user_repo.clone(),
+        password_hasher: b.password_hasher.clone(),
+        config: b.config.clone(),
+    };
+    register::execute(&deps, register_command(email, username))
+        .await
+        .unwrap();
+    let user = b
+        .user_repo
+        .find_by_email(&Email::new(email.into()).unwrap())
+        .await
+        .unwrap()
+        .unwrap();
+    user.id().value()
+}
+
+#[tokio::test]
+async fn get_page_viewer_reports_pending_follower_count() {
+    let b = TestContextBuilder::new();
+    let owner_uuid = setup_user(&b, "owner@test.com", "pageowner").await;
+    let follower1 = setup_user(&b, "follower1@test.com", "pagefollower1").await;
+    let follower2 = setup_user(&b, "follower2@test.com", "pagefollower2").await;
+
+    let owner_id = UserId::from_uuid(owner_uuid);
+    let target = FollowTarget::Identity(SocialIdentity::Local(owner_id.clone()));
+    b.social_command
+        .follow(&UserId::from_uuid(follower1), &target)
+        .await
+        .unwrap();
+    b.social_command
+        .follow(&UserId::from_uuid(follower2), &target)
+        .await
+        .unwrap();
+
+    let deps = GetPageViewerDeps {
+        user: b.user_repo.clone(),
+        follow_graph: b.social_query_unified.clone(),
+    };
+
+    let v = get_page_viewer::execute(&deps, owner_uuid).await.unwrap();
+    assert_eq!(v.pending_follow_count, 2);
+    assert!(!v.is_admin);
+}