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/update_settings_test.rs

@@ -0,0 +1,93 @@
+use crate::support::TestContextBuilder;
+use crate::support::update_user_settings_command;
+use std::sync::Arc;
+
+use domain::testing::InMemoryStore;
+use uuid::Uuid;
+
+use application::users::{
+    deps::{GetSettingsDeps, UpdateSettingsDeps},
+    get_settings,
+    update_settings::UpdateUserSettingsCommand,
+};
+
+#[tokio::test]
+async fn updates_federate_goals() {
+    let settings_repo = InMemoryStore::new();
+    let b = TestContextBuilder::new().with_user_settings(Arc::clone(&settings_repo) as _);
+    let user_settings = b.user_settings_repo.clone();
+    let uid = Uuid::nil();
+
+    application::users::update_settings::execute(
+        &UpdateSettingsDeps {
+            user_settings: user_settings.clone(),
+        },
+        UpdateUserSettingsCommand {
+            federate_goals: false,
+            ..update_user_settings_command(uid)
+        },
+    )
+    .await
+    .unwrap();
+
+    let settings = get_settings::execute(&GetSettingsDeps { user_settings }, uid)
+        .await
+        .unwrap();
+    assert!(!settings.federate_goals());
+    assert!(settings.federate_reviews());
+    assert!(settings.federate_watchlist());
+}
+
+#[tokio::test]
+async fn updates_federate_reviews() {
+    let settings_repo = InMemoryStore::new();
+    let b = TestContextBuilder::new().with_user_settings(Arc::clone(&settings_repo) as _);
+    let user_settings = b.user_settings_repo.clone();
+    let uid = Uuid::nil();
+
+    application::users::update_settings::execute(
+        &UpdateSettingsDeps {
+            user_settings: user_settings.clone(),
+        },
+        UpdateUserSettingsCommand {
+            federate_reviews: false,
+            ..update_user_settings_command(uid)
+        },
+    )
+    .await
+    .unwrap();
+
+    let settings = get_settings::execute(&GetSettingsDeps { user_settings }, uid)
+        .await
+        .unwrap();
+    assert!(settings.federate_goals());
+    assert!(!settings.federate_reviews());
+    assert!(settings.federate_watchlist());
+}
+
+#[tokio::test]
+async fn updates_federate_watchlist() {
+    let settings_repo = InMemoryStore::new();
+    let b = TestContextBuilder::new().with_user_settings(Arc::clone(&settings_repo) as _);
+    let user_settings = b.user_settings_repo.clone();
+    let uid = Uuid::nil();
+
+    application::users::update_settings::execute(
+        &UpdateSettingsDeps {
+            user_settings: user_settings.clone(),
+        },
+        UpdateUserSettingsCommand {
+            federate_watchlist: false,
+            ..update_user_settings_command(uid)
+        },
+    )
+    .await
+    .unwrap();
+
+    let settings = get_settings::execute(&GetSettingsDeps { user_settings }, uid)
+        .await
+        .unwrap();
+    assert!(settings.federate_goals());
+    assert!(settings.federate_reviews());
+    assert!(!settings.federate_watchlist());
+}