diff --git a/src/core/matrix/space_roles.rs b/src/core/matrix/space_roles.rs
index 560e3f00..aaadcf9f 100644
--- a/src/core/matrix/space_roles.rs
+++ b/src/core/matrix/space_roles.rs
@@ -97,4 +97,79 @@ mod tests {
 		let content: SpaceRolesEventContent = serde_json::from_str(json).unwrap();
 		assert!(content.roles.is_empty());
 	}
+
+	#[test]
+	fn deserialize_role_with_power_level() {
+		let json = r#"{"description":"Admin","power_level":100}"#;
+		let role: RoleDefinition = serde_json::from_str(json).unwrap();
+		assert_eq!(role.description, "Admin");
+		assert_eq!(role.power_level, Some(100));
+	}
+
+	#[test]
+	fn deserialize_role_without_power_level() {
+		let json = r#"{"description":"NSFW access"}"#;
+		let role: RoleDefinition = serde_json::from_str(json).unwrap();
+		assert!(role.power_level.is_none());
+	}
+
+	#[test]
+	fn power_level_omitted_in_serialization_when_none() {
+		let role = RoleDefinition {
+			description: "Test".to_owned(),
+			power_level: None,
+		};
+		let json = serde_json::to_string(&role).unwrap();
+		assert!(!json.contains("power_level"));
+	}
+
+	#[test]
+	fn empty_member_roles() {
+		let content = SpaceRoleMemberEventContent { roles: vec![] };
+		let json = serde_json::to_string(&content).unwrap();
+		let deserialized: SpaceRoleMemberEventContent = serde_json::from_str(&json).unwrap();
+		assert!(deserialized.roles.is_empty());
+	}
+
+	#[test]
+	fn empty_room_requirements() {
+		let content = SpaceRoleRoomEventContent {
+			required_roles: vec![],
+		};
+		let json = serde_json::to_string(&content).unwrap();
+		let deserialized: SpaceRoleRoomEventContent = serde_json::from_str(&json).unwrap();
+		assert!(deserialized.required_roles.is_empty());
+	}
+
+	#[test]
+	fn roles_ordering_preserved() {
+		let mut roles = BTreeMap::new();
+		roles.insert("zebra".to_owned(), RoleDefinition {
+			description: "Z".to_owned(),
+			power_level: None,
+		});
+		roles.insert("alpha".to_owned(), RoleDefinition {
+			description: "A".to_owned(),
+			power_level: None,
+		});
+		let content = SpaceRolesEventContent { roles };
+		let json = serde_json::to_string(&content).unwrap();
+		let deserialized: SpaceRolesEventContent = serde_json::from_str(&json).unwrap();
+		let keys: Vec<_> = deserialized.roles.keys().collect();
+		assert_eq!(keys, vec!["alpha", "zebra"]);
+	}
+
+	#[test]
+	fn negative_power_level() {
+		let json = r#"{"description":"Restricted","power_level":-10}"#;
+		let role: RoleDefinition = serde_json::from_str(json).unwrap();
+		assert_eq!(role.power_level, Some(-10));
+	}
+
+	#[test]
+	fn unknown_fields_ignored() {
+		let json = r#"{"roles":["nsfw"],"extra_field":"ignored"}"#;
+		let content: SpaceRoleMemberEventContent = serde_json::from_str(json).unwrap();
+		assert_eq!(content.roles, vec!["nsfw"]);
+	}
 }
diff --git a/src/service/rooms/roles/cache_tests.rs b/src/service/rooms/roles/cache_tests.rs
new file mode 100644
index 00000000..53f152ca
--- /dev/null
+++ b/src/service/rooms/roles/cache_tests.rs
@@ -0,0 +1,230 @@
+//! Tests for cache consistency of the space roles index structures.
+
+use std::collections::{BTreeMap, HashMap, HashSet};
+
+use conduwuit_core::matrix::space_roles::RoleDefinition;
+use ruma::{room_id, user_id, OwnedRoomId, OwnedUserId};
+
+use super::tests::{make_requirements, make_roles, make_user_roles};
+
+/// Simulates the full cache state for a space.
+struct MockCache {
+	roles: HashMap<OwnedRoomId, BTreeMap<String, RoleDefinition>>,
+	user_roles: HashMap<OwnedRoomId, HashMap<OwnedUserId, HashSet<String>>>,
+	room_requirements: HashMap<OwnedRoomId, HashMap<OwnedRoomId, HashSet<String>>>,
+	room_to_space: HashMap<OwnedRoomId, OwnedRoomId>,
+}
+
+impl MockCache {
+	fn new() -> Self {
+		Self {
+			roles: HashMap::new(),
+			user_roles: HashMap::new(),
+			room_requirements: HashMap::new(),
+			room_to_space: HashMap::new(),
+		}
+	}
+
+	fn add_space(&mut self, space: OwnedRoomId, roles: BTreeMap<String, RoleDefinition>) {
+		self.roles.insert(space, roles);
+	}
+
+	fn add_child(&mut self, space: &OwnedRoomId, child: OwnedRoomId) {
+		self.room_to_space.insert(child, space.clone());
+	}
+
+	fn assign_role(&mut self, space: &OwnedRoomId, user: OwnedUserId, role: String) {
+		self.user_roles
+			.entry(space.clone())
+			.or_default()
+			.entry(user)
+			.or_default()
+			.insert(role);
+	}
+
+	fn revoke_role(&mut self, space: &OwnedRoomId, user: &OwnedUserId, role: &str) {
+		if let Some(space_users) = self.user_roles.get_mut(space) {
+			if let Some(user_roles) = space_users.get_mut(user) {
+				user_roles.remove(role);
+			}
+		}
+	}
+
+	fn set_room_requirements(
+		&mut self,
+		space: &OwnedRoomId,
+		room: OwnedRoomId,
+		reqs: HashSet<String>,
+	) {
+		self.room_requirements
+			.entry(space.clone())
+			.or_default()
+			.insert(room, reqs);
+	}
+
+	fn user_qualifies(
+		&self,
+		space: &OwnedRoomId,
+		room: &OwnedRoomId,
+		user: &OwnedUserId,
+	) -> bool {
+		let reqs = self
+			.room_requirements
+			.get(space)
+			.and_then(|r| r.get(room));
+
+		match reqs {
+			| None => true,
+			| Some(required) if required.is_empty() => true,
+			| Some(required) => {
+				let assigned = self.user_roles.get(space).and_then(|u| u.get(user));
+				match assigned {
+					| None => false,
+					| Some(roles) => required.iter().all(|r| roles.contains(r)),
+				}
+			},
+		}
+	}
+
+	fn get_power_level(&self, space: &OwnedRoomId, user: &OwnedUserId) -> Option<i64> {
+		let role_defs = self.roles.get(space)?;
+		let assigned = self.user_roles.get(space)?.get(user)?;
+		assigned
+			.iter()
+			.filter_map(|r| role_defs.get(r)?.power_level)
+			.max()
+	}
+
+	fn clear(&mut self) {
+		self.roles.clear();
+		self.user_roles.clear();
+		self.room_requirements.clear();
+		self.room_to_space.clear();
+	}
+}
+
+#[test]
+fn cache_populate_and_lookup() {
+	let mut cache = MockCache::new();
+	let space = room_id!("!space:example.com").to_owned();
+	let child = room_id!("!child:example.com").to_owned();
+	let alice = user_id!("@alice:example.com").to_owned();
+
+	cache.add_space(
+		space.clone(),
+		make_roles(&[("admin", Some(100)), ("nsfw", None)]),
+	);
+	cache.add_child(&space, child.clone());
+	cache.assign_role(&space, alice.clone(), "nsfw".to_owned());
+	cache.set_room_requirements(&space, child.clone(), make_requirements(&["nsfw"]));
+
+	assert!(cache.user_qualifies(&space, &child, &alice));
+	assert_eq!(cache.get_power_level(&space, &alice), None); // nsfw has no PL
+}
+
+#[test]
+fn cache_invalidation_on_role_revoke() {
+	let mut cache = MockCache::new();
+	let space = room_id!("!space:example.com").to_owned();
+	let child = room_id!("!nsfw:example.com").to_owned();
+	let alice = user_id!("@alice:example.com").to_owned();
+
+	cache.add_space(space.clone(), make_roles(&[("nsfw", None)]));
+	cache.assign_role(&space, alice.clone(), "nsfw".to_owned());
+	cache.set_room_requirements(&space, child.clone(), make_requirements(&["nsfw"]));
+
+	assert!(cache.user_qualifies(&space, &child, &alice));
+
+	// Revoke
+	cache.revoke_role(&space, &alice, "nsfw");
+	assert!(!cache.user_qualifies(&space, &child, &alice));
+}
+
+#[test]
+fn cache_invalidation_on_requirement_change() {
+	let mut cache = MockCache::new();
+	let space = room_id!("!space:example.com").to_owned();
+	let child = room_id!("!room:example.com").to_owned();
+	let alice = user_id!("@alice:example.com").to_owned();
+
+	cache.add_space(
+		space.clone(),
+		make_roles(&[("nsfw", None), ("vip", None)]),
+	);
+	cache.assign_role(&space, alice.clone(), "vip".to_owned());
+	cache.set_room_requirements(&space, child.clone(), make_requirements(&["vip"]));
+
+	assert!(cache.user_qualifies(&space, &child, &alice));
+
+	// Add nsfw requirement
+	cache.set_room_requirements(
+		&space,
+		child.clone(),
+		make_requirements(&["vip", "nsfw"]),
+	);
+	assert!(!cache.user_qualifies(&space, &child, &alice));
+}
+
+#[test]
+fn cache_clear_empties_all() {
+	let mut cache = MockCache::new();
+	let space = room_id!("!space:example.com").to_owned();
+	cache.add_space(space.clone(), make_roles(&[("admin", Some(100))]));
+	cache.assign_role(
+		&space,
+		user_id!("@alice:example.com").to_owned(),
+		"admin".to_owned(),
+	);
+
+	cache.clear();
+
+	assert!(cache.roles.is_empty());
+	assert!(cache.user_roles.is_empty());
+	assert!(cache.room_requirements.is_empty());
+	assert!(cache.room_to_space.is_empty());
+}
+
+#[test]
+fn cache_reverse_lookup_consistency() {
+	let mut cache = MockCache::new();
+	let space = room_id!("!space:example.com").to_owned();
+	let child1 = room_id!("!child1:example.com").to_owned();
+	let child2 = room_id!("!child2:example.com").to_owned();
+
+	cache.add_child(&space, child1.clone());
+	cache.add_child(&space, child2.clone());
+
+	assert_eq!(cache.room_to_space.get(&child1), Some(&space));
+	assert_eq!(cache.room_to_space.get(&child2), Some(&space));
+	assert_eq!(
+		cache.room_to_space.get(room_id!("!unknown:example.com")),
+		None
+	);
+}
+
+#[test]
+fn cache_power_level_updates_on_role_change() {
+	let mut cache = MockCache::new();
+	let space = room_id!("!space:example.com").to_owned();
+	let alice = user_id!("@alice:example.com").to_owned();
+
+	cache.add_space(
+		space.clone(),
+		make_roles(&[("admin", Some(100)), ("mod", Some(50))]),
+	);
+
+	// No roles -> no PL
+	assert_eq!(cache.get_power_level(&space, &alice), None);
+
+	// Assign mod -> PL 50
+	cache.assign_role(&space, alice.clone(), "mod".to_owned());
+	assert_eq!(cache.get_power_level(&space, &alice), Some(50));
+
+	// Also assign admin -> PL 100 (highest wins)
+	cache.assign_role(&space, alice.clone(), "admin".to_owned());
+	assert_eq!(cache.get_power_level(&space, &alice), Some(100));
+
+	// Revoke admin -> back to PL 50
+	cache.revoke_role(&space, &alice, "admin");
+	assert_eq!(cache.get_power_level(&space, &alice), Some(50));
+}
diff --git a/src/service/rooms/roles/integration_tests.rs b/src/service/rooms/roles/integration_tests.rs
new file mode 100644
index 00000000..15179ebc
--- /dev/null
+++ b/src/service/rooms/roles/integration_tests.rs
@@ -0,0 +1,143 @@
+use std::collections::{HashMap, HashSet};
+
+use ruma::{room_id, user_id};
+
+use super::tests::{make_requirements, make_roles, make_user_roles};
+
+#[test]
+fn scenario_user_gains_and_loses_access() {
+	let room_reqs = make_requirements(&["nsfw"]);
+
+	let no_roles: HashSet<String> = HashSet::new();
+	assert!(!room_reqs.iter().all(|r| no_roles.contains(r)));
+
+	let with_nsfw = make_user_roles(&["nsfw"]);
+	assert!(room_reqs.iter().all(|r| with_nsfw.contains(r)));
+
+	let no_roles: HashSet<String> = HashSet::new();
+	assert!(!room_reqs.iter().all(|r| no_roles.contains(r)));
+}
+
+#[test]
+fn scenario_room_adds_requirement_existing_members_checked() {
+	let alice_roles = make_user_roles(&["vip"]);
+	let bob_roles = make_user_roles(&["vip", "nsfw"]);
+
+	let empty_reqs: HashSet<String> = HashSet::new();
+	assert!(empty_reqs.iter().all(|r| alice_roles.contains(r)));
+	assert!(empty_reqs.iter().all(|r| bob_roles.contains(r)));
+
+	let new_reqs = make_requirements(&["nsfw"]);
+	assert!(!new_reqs.iter().all(|r| alice_roles.contains(r)));
+	assert!(new_reqs.iter().all(|r| bob_roles.contains(r)));
+}
+
+#[test]
+fn scenario_multiple_rooms_different_requirements() {
+	let alice_roles = make_user_roles(&["nsfw", "vip"]);
+	let bob_roles = make_user_roles(&["nsfw"]);
+
+	let nsfw_reqs = make_requirements(&["nsfw"]);
+	let vip_reqs = make_requirements(&["vip"]);
+	let both_reqs = make_requirements(&["nsfw", "vip"]);
+
+	assert!(nsfw_reqs.iter().all(|r| alice_roles.contains(r)));
+	assert!(vip_reqs.iter().all(|r| alice_roles.contains(r)));
+	assert!(both_reqs.iter().all(|r| alice_roles.contains(r)));
+
+	assert!(nsfw_reqs.iter().all(|r| bob_roles.contains(r)));
+	assert!(!vip_reqs.iter().all(|r| bob_roles.contains(r)));
+	assert!(!both_reqs.iter().all(|r| bob_roles.contains(r)));
+}
+
+#[test]
+fn scenario_power_level_cascading_highest_wins() {
+	let roles = make_roles(&[
+		("admin", Some(100)),
+		("mod", Some(50)),
+		("helper", Some(25)),
+	]);
+
+	let admin_mod = make_user_roles(&["admin", "mod"]);
+	assert_eq!(
+		admin_mod
+			.iter()
+			.filter_map(|r| roles.get(r)?.power_level)
+			.max(),
+		Some(100)
+	);
+
+	let helper = make_user_roles(&["helper"]);
+	assert_eq!(
+		helper
+			.iter()
+			.filter_map(|r| roles.get(r)?.power_level)
+			.max(),
+		Some(25)
+	);
+}
+
+#[test]
+fn scenario_roles_do_not_cascade_across_spaces() {
+	let space_a = room_id!("!space_a:example.com");
+	let space_b = room_id!("!space_b:example.com");
+	let alice = user_id!("@alice:example.com");
+
+	let mut space_user_roles: HashMap<_, HashMap<_, HashSet<String>>> = HashMap::new();
+	space_user_roles
+		.entry(space_a.to_owned())
+		.or_default()
+		.insert(alice.to_owned(), make_user_roles(&["nsfw"]));
+
+	let alice_roles_in_b = space_user_roles
+		.get(space_b)
+		.and_then(|users| users.get(alice));
+	assert!(alice_roles_in_b.is_none());
+}
+
+#[test]
+fn scenario_identify_auto_join_candidates() {
+	let alice_roles = make_user_roles(&["nsfw", "vip"]);
+
+	let mut room_reqs: HashMap<String, HashSet<String>> = HashMap::new();
+	room_reqs.insert("general".to_owned(), HashSet::new());
+	room_reqs.insert("nsfw-chat".to_owned(), make_requirements(&["nsfw"]));
+	room_reqs.insert("vip-lounge".to_owned(), make_requirements(&["vip"]));
+	room_reqs.insert("staff-only".to_owned(), make_requirements(&["staff"]));
+
+	let qualifying: Vec<_> = room_reqs
+		.iter()
+		.filter(|(_, reqs)| reqs.iter().all(|r| alice_roles.contains(r)))
+		.map(|(name, _)| name.clone())
+		.collect();
+
+	assert!(qualifying.contains(&"general".to_owned()));
+	assert!(qualifying.contains(&"nsfw-chat".to_owned()));
+	assert!(qualifying.contains(&"vip-lounge".to_owned()));
+	assert!(!qualifying.contains(&"staff-only".to_owned()));
+}
+
+#[test]
+fn scenario_identify_kick_candidates_after_role_revocation() {
+	let alice_roles_after = make_user_roles(&["vip"]);
+
+	let mut rooms: HashMap<String, HashSet<String>> = HashMap::new();
+	rooms.insert("general".to_owned(), HashSet::new());
+	rooms.insert("nsfw-chat".to_owned(), make_requirements(&["nsfw"]));
+	rooms.insert("vip-lounge".to_owned(), make_requirements(&["vip"]));
+	rooms.insert(
+		"nsfw-vip".to_owned(),
+		make_requirements(&["nsfw", "vip"]),
+	);
+
+	let kick_from: Vec<_> = rooms
+		.iter()
+		.filter(|(_, reqs)| !reqs.iter().all(|r| alice_roles_after.contains(r)))
+		.map(|(name, _)| name.clone())
+		.collect();
+
+	assert!(kick_from.contains(&"nsfw-chat".to_owned()));
+	assert!(kick_from.contains(&"nsfw-vip".to_owned()));
+	assert!(!kick_from.contains(&"general".to_owned()));
+	assert!(!kick_from.contains(&"vip-lounge".to_owned()));
+}
diff --git a/src/service/rooms/roles/mod.rs b/src/service/rooms/roles/mod.rs
index 1bc146cb..9321ba67 100644
--- a/src/service/rooms/roles/mod.rs
+++ b/src/service/rooms/roles/mod.rs
@@ -1,3 +1,10 @@
+#[cfg(test)]
+mod cache_tests;
+#[cfg(test)]
+mod integration_tests;
+#[cfg(test)]
+mod tests;
+
 use std::{
 	collections::{BTreeMap, HashMap, HashSet},
 	fmt::Write,
diff --git a/src/service/rooms/roles/tests.rs b/src/service/rooms/roles/tests.rs
new file mode 100644
index 00000000..0af8f742
--- /dev/null
+++ b/src/service/rooms/roles/tests.rs
@@ -0,0 +1,152 @@
+use std::collections::{BTreeMap, HashMap, HashSet};
+
+use conduwuit_core::matrix::space_roles::RoleDefinition;
+use ruma::{room_id, OwnedRoomId};
+
+/// Helper to build a role definitions map.
+pub fn make_roles(entries: &[(&str, Option<i64>)]) -> BTreeMap<String, RoleDefinition> {
+	entries
+		.iter()
+		.map(|(name, pl)| {
+			(
+				(*name).to_owned(),
+				RoleDefinition {
+					description: format!("{name} role"),
+					power_level: *pl,
+				},
+			)
+		})
+		.collect()
+}
+
+pub fn make_user_roles(roles: &[&str]) -> HashSet<String> {
+	roles.iter().map(|s| (*s).to_owned()).collect()
+}
+
+pub fn make_requirements(roles: &[&str]) -> HashSet<String> {
+	roles.iter().map(|s| (*s).to_owned()).collect()
+}
+
+#[test]
+fn power_level_single_role() {
+	let roles = make_roles(&[("admin", Some(100)), ("mod", Some(50))]);
+	let user_assigned = make_user_roles(&["admin"]);
+	let max_pl = user_assigned
+		.iter()
+		.filter_map(|r| roles.get(r)?.power_level)
+		.max();
+	assert_eq!(max_pl, Some(100));
+}
+
+#[test]
+fn power_level_multiple_roles_takes_highest() {
+	let roles = make_roles(&[
+		("admin", Some(100)),
+		("mod", Some(50)),
+		("helper", Some(25)),
+	]);
+	let user_assigned = make_user_roles(&["mod", "helper"]);
+	let max_pl = user_assigned
+		.iter()
+		.filter_map(|r| roles.get(r)?.power_level)
+		.max();
+	assert_eq!(max_pl, Some(50));
+}
+
+#[test]
+fn power_level_no_power_roles() {
+	let roles = make_roles(&[("nsfw", None), ("vip", None)]);
+	let user_assigned = make_user_roles(&["nsfw", "vip"]);
+	let max_pl = user_assigned
+		.iter()
+		.filter_map(|r| roles.get(r)?.power_level)
+		.max();
+	assert_eq!(max_pl, None);
+}
+
+#[test]
+fn power_level_mixed_roles() {
+	let roles = make_roles(&[("mod", Some(50)), ("nsfw", None)]);
+	let user_assigned = make_user_roles(&["mod", "nsfw"]);
+	let max_pl = user_assigned
+		.iter()
+		.filter_map(|r| roles.get(r)?.power_level)
+		.max();
+	assert_eq!(max_pl, Some(50));
+}
+
+#[test]
+fn power_level_no_roles_assigned() {
+	let roles = make_roles(&[("admin", Some(100))]);
+	let user_assigned: HashSet<String> = HashSet::new();
+	let max_pl = user_assigned
+		.iter()
+		.filter_map(|r| roles.get(r)?.power_level)
+		.max();
+	assert_eq!(max_pl, None);
+}
+
+#[test]
+fn power_level_unknown_role_ignored() {
+	let roles = make_roles(&[("admin", Some(100))]);
+	let user_assigned = make_user_roles(&["nonexistent"]);
+	let max_pl = user_assigned
+		.iter()
+		.filter_map(|r| roles.get(r)?.power_level)
+		.max();
+	assert_eq!(max_pl, None);
+}
+
+#[test]
+fn qualifies_with_all_required_roles() {
+	let required = make_requirements(&["nsfw", "vip"]);
+	let user_assigned = make_user_roles(&["nsfw", "vip", "extra"]);
+	assert!(required.iter().all(|r| user_assigned.contains(r)));
+}
+
+#[test]
+fn does_not_qualify_missing_one_role() {
+	let required = make_requirements(&["nsfw", "vip"]);
+	let user_assigned = make_user_roles(&["nsfw"]);
+	assert!(!required.iter().all(|r| user_assigned.contains(r)));
+}
+
+#[test]
+fn qualifies_with_no_requirements() {
+	let required: HashSet<String> = HashSet::new();
+	let user_assigned = make_user_roles(&["nsfw"]);
+	assert!(required.iter().all(|r| user_assigned.contains(r)));
+}
+
+#[test]
+fn does_not_qualify_with_no_roles() {
+	let required = make_requirements(&["nsfw"]);
+	let user_assigned: HashSet<String> = HashSet::new();
+	assert!(!required.iter().all(|r| user_assigned.contains(r)));
+}
+
+#[test]
+fn qualifies_empty_requirements_empty_roles() {
+	let required: HashSet<String> = HashSet::new();
+	let user_assigned: HashSet<String> = HashSet::new();
+	assert!(required.iter().all(|r| user_assigned.contains(r)));
+}
+
+#[test]
+fn room_to_space_lookup() {
+	let mut room_to_space: HashMap<OwnedRoomId, OwnedRoomId> = HashMap::new();
+	let space = room_id!("!space:example.com").to_owned();
+	let child = room_id!("!child:example.com").to_owned();
+	room_to_space.insert(child.clone(), space.clone());
+	assert_eq!(room_to_space.get(&child), Some(&space));
+	assert_eq!(room_to_space.get(room_id!("!unknown:example.com")), None);
+}
+
+#[test]
+fn default_roles_contain_admin_and_mod() {
+	let roles = make_roles(&[("admin", Some(100)), ("mod", Some(50))]);
+	assert!(roles.contains_key("admin"));
+	assert!(roles.contains_key("mod"));
+	assert_eq!(roles["admin"].power_level, Some(100));
+	assert_eq!(roles["mod"].power_level, Some(50));
+}