test(spaces): add multi-space scenario tests

Cover highest-wins PL logic across multiple parent spaces, OR-based
join/kick qualification, edge cases (one space has no PL, neither has
PL, user only in one space, same role different PLs across spaces).

src/service/rooms/roles/tests.rs

@@ -78,3 +78,124 @@ fn qualifies_with_no_requirements() {
 fn does_not_qualify_with_no_roles() {
 	assert!(!roles_satisfy_requirements(&make_set(&["nsfw"]), &HashSet::new()));
 }
+
+// Multi-space scenarios
+
+#[test]
+fn multi_space_highest_pl_wins() {
+	let space_a_roles = make_roles(&[("mod", Some(50))]);
+	let space_b_roles = make_roles(&[("admin", Some(100))]);
+
+	let user_roles_a = make_set(&["mod"]);
+	let user_roles_b = make_set(&["admin"]);
+
+	let pl_a = compute_user_power_level(&space_a_roles, &user_roles_a);
+	let pl_b = compute_user_power_level(&space_b_roles, &user_roles_b);
+
+	let effective = [pl_a, pl_b].into_iter().flatten().max();
+	assert_eq!(effective, Some(100));
+}
+
+#[test]
+fn multi_space_one_space_has_no_pl() {
+	let space_a_roles = make_roles(&[("nsfw", None)]);
+	let space_b_roles = make_roles(&[("mod", Some(50))]);
+
+	let user_roles_a = make_set(&["nsfw"]);
+	let user_roles_b = make_set(&["mod"]);
+
+	let pl_a = compute_user_power_level(&space_a_roles, &user_roles_a);
+	let pl_b = compute_user_power_level(&space_b_roles, &user_roles_b);
+
+	let effective = [pl_a, pl_b].into_iter().flatten().max();
+	assert_eq!(effective, Some(50));
+}
+
+#[test]
+fn multi_space_neither_has_pl() {
+	let space_a_roles = make_roles(&[("nsfw", None)]);
+	let space_b_roles = make_roles(&[("vip", None)]);
+
+	let user_roles_a = make_set(&["nsfw"]);
+	let user_roles_b = make_set(&["vip"]);
+
+	let pl_a = compute_user_power_level(&space_a_roles, &user_roles_a);
+	let pl_b = compute_user_power_level(&space_b_roles, &user_roles_b);
+
+	let effective = [pl_a, pl_b].into_iter().flatten().max();
+	assert_eq!(effective, None);
+}
+
+#[test]
+fn multi_space_user_only_in_one_space() {
+	let space_a_roles = make_roles(&[("admin", Some(100))]);
+	let space_b_roles = make_roles(&[("mod", Some(50))]);
+
+	let user_roles_a = make_set(&["admin"]);
+	let user_roles_b: HashSet<String> = HashSet::new();
+
+	let pl_a = compute_user_power_level(&space_a_roles, &user_roles_a);
+	let pl_b = compute_user_power_level(&space_b_roles, &user_roles_b);
+
+	let effective = [pl_a, pl_b].into_iter().flatten().max();
+	assert_eq!(effective, Some(100));
+}
+
+#[test]
+fn multi_space_join_or_logic_qualifies_in_any() {
+	let space_a_reqs = make_set(&["staff"]);
+	let space_b_reqs = make_set(&["nsfw"]);
+
+	let user_roles = make_set(&["nsfw"]);
+
+	let qualifies_a = roles_satisfy_requirements(&space_a_reqs, &user_roles);
+	let qualifies_b = roles_satisfy_requirements(&space_b_reqs, &user_roles);
+
+	assert!(!qualifies_a);
+	assert!(qualifies_b);
+	assert!(qualifies_a || qualifies_b);
+}
+
+#[test]
+fn multi_space_kick_or_logic_qualifies_in_other() {
+	let space_a_reqs = make_set(&["nsfw"]);
+	let space_b_reqs = make_set(&["vip"]);
+
+	let user_roles_after_revoke = make_set(&["vip"]);
+
+	let qualifies_a = roles_satisfy_requirements(&space_a_reqs, &user_roles_after_revoke);
+	let qualifies_b = roles_satisfy_requirements(&space_b_reqs, &user_roles_after_revoke);
+
+	assert!(!qualifies_a);
+	assert!(qualifies_b);
+	assert!(qualifies_a || qualifies_b);
+}
+
+#[test]
+fn multi_space_no_qualification_anywhere() {
+	let space_a_reqs = make_set(&["staff"]);
+	let space_b_reqs = make_set(&["admin"]);
+
+	let user_roles = make_set(&["nsfw"]);
+
+	let qualifies_a = roles_satisfy_requirements(&space_a_reqs, &user_roles);
+	let qualifies_b = roles_satisfy_requirements(&space_b_reqs, &user_roles);
+
+	assert!(!qualifies_a);
+	assert!(!qualifies_b);
+	assert!(!(qualifies_a || qualifies_b));
+}
+
+#[test]
+fn multi_space_same_role_different_pl() {
+	let space_a_roles = make_roles(&[("mod", Some(50))]);
+	let space_b_roles = make_roles(&[("mod", Some(75))]);
+
+	let user_roles = make_set(&["mod"]);
+
+	let pl_a = compute_user_power_level(&space_a_roles, &user_roles);
+	let pl_b = compute_user_power_level(&space_b_roles, &user_roles);
+
+	let effective = [pl_a, pl_b].into_iter().flatten().max();
+	assert_eq!(effective, Some(75));
+}