Add tests for lifecycle contributor precedence

We had already implemented these but didn’t have tests.

Resolves #153.

Tests/AblyChatTests/DefaultRoomTests.swift

@@ -100,6 +100,30 @@ struct DefaultRoomTests {
         #expect(Set(channelsGetArguments.map(\.name)) == Set(expectedFetchedChannelNames))
     }
 
+    // @spec CHA-RC2e
+    // @spec CHA-RL10
+    @Test
+    func lifecycleContributorOrder() async throws {
+        // Given: a DefaultRoom, instance, with all room features enabled
+        let channelsList = [
+            MockRealtimeChannel(name: "basketball::$chat::$chatMessages"),
+            MockRealtimeChannel(name: "basketball::$chat::$reactions"),
+            MockRealtimeChannel(name: "basketball::$chat::$typingIndicators"),
+        ]
+        let channels = MockChannels(channels: channelsList)
+        let realtime = MockRealtime.create(channels: channels)
+        let lifecycleManagerFactory = MockRoomLifecycleManagerFactory()
+        _ = try await DefaultRoom(realtime: realtime, chatAPI: ChatAPI(realtime: realtime), roomID: "basketball", options: .allFeaturesEnabled, logger: TestLogger(), lifecycleManagerFactory: lifecycleManagerFactory)
+
+        // Then: The array of contributors with which it initializes the RoomLifecycleManager are in the same order as the following list:
+        //
+        // messages, presence, typing, reactions, occupancy
+        //
+        // (note that we do not say that it is the _same_ list, because we combine multiple features into a single contributor)
+        let lifecycleManagerCreationArguments = try #require(await lifecycleManagerFactory.createManagerArguments.first)
+        #expect(lifecycleManagerCreationArguments.contributors.map(\.feature) == [.messages, .typing, .reactions])
+    }
+
     // @specUntested CHA-RC2b - We chose to implement this failure with an idiomatic fatalError instead of throwing, but we can’t test this.
 
     // This is just a basic sense check to make sure the room getters are working as expected, since we don’t have unit tests for some of the features at the moment.