[ECO-5517] Added comprehensive unit tests for liveobjects Helpers

Author: sacOO7

lib/src/main/java/io/ably/lib/realtime/ChannelBase.java

@@ -1287,7 +1287,7 @@ public Map<String, String> getParams() {
 
     public ChannelMode[] getModes() {
         if (modes == null) {
-            return null;
+            return new ChannelMode[0];
         }
         return modes.toArray(new ChannelMode[modes.size()]);
     }

live-objects/src/main/kotlin/io/ably/lib/objects/Helpers.kt

@@ -138,15 +138,15 @@ internal fun LiveObjectsAdapter.throwIfUnpublishableState(channelName: String) {
 }
 
 // Spec: RTO2
-internal fun LiveObjectsAdapter.throwIfMissingChannelMode(channelName: String, channelMode: ChannelMode) {
+private fun LiveObjectsAdapter.throwIfMissingChannelMode(channelName: String, channelMode: ChannelMode) {
   val channelModes = getChannelModes(channelName)
   if (channelModes == null || !channelModes.contains(channelMode)) {
     // Spec: RTO2a2, RTO2b2
     throw ablyException("\"${channelMode.name}\" channel mode must be set for this operation", ErrorCode.ChannelModeRequired)
   }
 }
 
-internal fun LiveObjectsAdapter.throwIfInChannelState(channelName: String, channelStates: Array<ChannelState>) {
+private fun LiveObjectsAdapter.throwIfInChannelState(channelName: String, channelStates: Array<ChannelState>) {
   val currentState = getChannel(channelName).state
   if (currentState == null || channelStates.contains(currentState)) {
     throw ablyException("Channel is in invalid state: $currentState", ErrorCode.ChannelStateError)

live-objects/src/test/kotlin/io/ably/lib/objects/integration/setup/IntegrationTest.kt

@@ -29,12 +29,11 @@ abstract class IntegrationTest {
   /**
    * Retrieves a realtime channel for the specified channel name and client ID
    * If a client with the given clientID does not exist, a new client is created using the provided options.
-   * The channel is attached and ensured to be in the attached state before returning.
    *
    * @param channelName Name of the channel
    * @param clientId The ID of the client to use or create. Defaults to "client1".
-   * @return The attached realtime channel.
-   * @throws Exception If the channel fails to attach or the client fails to connect.
+   * @return The realtime channel in the INITIALIZED state.
+   * @throws Exception If the client fails to connect.
    */
   internal suspend fun getRealtimeChannel(channelName: String, clientId: String = "client1"): Channel {
     val client = realtimeClients.getOrPut(clientId) {