diff --git a/chat-android/src/test/java/com/ably/chat/Sandbox.kt b/chat-android/src/test/java/com/ably/chat/Sandbox.kt
index 1f4e153f..fd74e3bd 100644
--- a/chat-android/src/test/java/com/ably/chat/Sandbox.kt
+++ b/chat-android/src/test/java/com/ably/chat/Sandbox.kt
@@ -64,8 +64,8 @@ internal fun Sandbox.createSandboxRealtime(chatClientId: String): AblyRealtime =
         },
     )
 
-internal suspend fun Sandbox.getConnectedChatClient(): DefaultChatClient {
-    val realtime = createSandboxRealtime(apiKey)
+internal suspend fun Sandbox.getConnectedChatClient(chatClientId: String = "sandbox-client"): DefaultChatClient {
+    val realtime = createSandboxRealtime(chatClientId)
     realtime.ensureConnected()
     return DefaultChatClient(realtime, ClientOptions())
 }
@@ -78,6 +78,7 @@ private suspend fun AblyRealtime.ensureConnected() {
     this.connection.on {
         if (it.event == ConnectionEvent.connected) {
             connectedDeferred.complete(Unit)
+            this.connection.off()
         } else if (it.event != ConnectionEvent.connecting) {
             connectedDeferred.completeExceptionally(serverError("ably connection failed"))
             this.connection.off()
diff --git a/chat-android/src/test/java/com/ably/chat/room/lifecycle/AttachTest.kt b/chat-android/src/test/java/com/ably/chat/room/lifecycle/AttachTest.kt
index 5736ab88..9faf157f 100644
--- a/chat-android/src/test/java/com/ably/chat/room/lifecycle/AttachTest.kt
+++ b/chat-android/src/test/java/com/ably/chat/room/lifecycle/AttachTest.kt
@@ -27,6 +27,7 @@ import io.mockk.justRun
 import io.mockk.mockkStatic
 import io.mockk.slot
 import io.mockk.spyk
+import io.mockk.unmockkStatic
 import io.mockk.verify
 import kotlinx.coroutines.CoroutineName
 import kotlinx.coroutines.CoroutineScope
@@ -38,6 +39,7 @@ import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.test.runTest
+import org.junit.After
 import org.junit.Assert
 import org.junit.Test
 
@@ -52,6 +54,11 @@ class AttachTest {
         Dispatchers.Default.limitedParallelism(1) + CoroutineName("roomId"),
     )
 
+    @After
+    fun tearDown() {
+        unmockkStatic(io.ably.lib.realtime.Channel::attachCoroutine)
+    }
+
     @Test
     fun `(CHA-RL1a) Attach success when room is already in attached state`() = runTest {
         val statusLifecycle = spyk(DefaultRoomLifecycle(logger)).apply {
diff --git a/chat-android/src/test/java/com/ably/chat/room/lifecycle/DetachTest.kt b/chat-android/src/test/java/com/ably/chat/room/lifecycle/DetachTest.kt
index 6fc78aac..256bbf5c 100644
--- a/chat-android/src/test/java/com/ably/chat/room/lifecycle/DetachTest.kt
+++ b/chat-android/src/test/java/com/ably/chat/room/lifecycle/DetachTest.kt
@@ -9,6 +9,7 @@ import com.ably.chat.RoomStatus
 import com.ably.chat.RoomStatusChange
 import com.ably.chat.ablyException
 import com.ably.chat.assertWaiter
+import com.ably.chat.attachCoroutine
 import com.ably.chat.detachCoroutine
 import com.ably.chat.room.atomicCoroutineScope
 import com.ably.chat.room.createMockLogger
@@ -22,6 +23,7 @@ import io.mockk.coVerify
 import io.mockk.justRun
 import io.mockk.mockkStatic
 import io.mockk.spyk
+import io.mockk.unmockkStatic
 import io.mockk.verify
 import kotlinx.coroutines.CoroutineName
 import kotlinx.coroutines.CoroutineScope
@@ -33,6 +35,7 @@ import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.test.runTest
+import org.junit.After
 import org.junit.Assert
 import org.junit.Test
 
@@ -47,6 +50,11 @@ class DetachTest {
         Dispatchers.Default.limitedParallelism(1) + CoroutineName("roomId"),
     )
 
+    @After
+    fun tearDown() {
+        unmockkStatic(io.ably.lib.realtime.Channel::attachCoroutine)
+    }
+
     @Test
     fun `(CHA-RL2a) Detach success when room is already in detached state`() = runTest {
         val statusLifecycle = spyk(DefaultRoomLifecycle(logger)).apply {
diff --git a/chat-android/src/test/java/com/ably/chat/room/lifecycle/ReleaseTest.kt b/chat-android/src/test/java/com/ably/chat/room/lifecycle/ReleaseTest.kt
index 0a05f3d6..5f70b4f8 100644
--- a/chat-android/src/test/java/com/ably/chat/room/lifecycle/ReleaseTest.kt
+++ b/chat-android/src/test/java/com/ably/chat/room/lifecycle/ReleaseTest.kt
@@ -5,6 +5,7 @@ import com.ably.chat.RoomLifecycleManager
 import com.ably.chat.RoomStatus
 import com.ably.chat.RoomStatusChange
 import com.ably.chat.assertWaiter
+import com.ably.chat.attachCoroutine
 import com.ably.chat.detachCoroutine
 import com.ably.chat.room.atomicCoroutineScope
 import com.ably.chat.room.createMockLogger
@@ -17,6 +18,7 @@ import io.mockk.every
 import io.mockk.justRun
 import io.mockk.mockkStatic
 import io.mockk.spyk
+import io.mockk.unmockkStatic
 import io.mockk.verify
 import kotlinx.coroutines.CoroutineName
 import kotlinx.coroutines.CoroutineScope
@@ -26,6 +28,7 @@ import kotlinx.coroutines.channels.Channel
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.test.runTest
+import org.junit.After
 import org.junit.Assert
 import org.junit.Test
 
@@ -39,6 +42,11 @@ class ReleaseTest {
         Dispatchers.Default.limitedParallelism(1) + CoroutineName("roomId"),
     )
 
+    @After
+    fun tearDown() {
+        unmockkStatic(io.ably.lib.realtime.Channel::attachCoroutine)
+    }
+
     @Test
     fun `(CHA-RL3a) Release success when room is already in released state`() = runTest {
         val statusLifecycle = spyk(DefaultRoomLifecycle(logger)).apply {
diff --git a/chat-android/src/test/java/com/ably/chat/room/lifecycle/RetryTest.kt b/chat-android/src/test/java/com/ably/chat/room/lifecycle/RetryTest.kt
index 44b4c426..edfcafc4 100644
--- a/chat-android/src/test/java/com/ably/chat/room/lifecycle/RetryTest.kt
+++ b/chat-android/src/test/java/com/ably/chat/room/lifecycle/RetryTest.kt
@@ -22,11 +22,13 @@ import io.mockk.every
 import io.mockk.justRun
 import io.mockk.mockkStatic
 import io.mockk.spyk
+import io.mockk.unmockkStatic
 import io.mockk.verify
 import kotlinx.coroutines.CoroutineName
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.test.runTest
+import org.junit.After
 import org.junit.Assert
 import org.junit.Test
 
@@ -40,6 +42,11 @@ class RetryTest {
         Dispatchers.Default.limitedParallelism(1) + CoroutineName("roomId"),
     )
 
+    @After
+    fun tearDown() {
+        unmockkStatic(io.ably.lib.realtime.Channel::attachCoroutine)
+    }
+
     @Test
     fun `(CHA-RL5a) Retry detaches all contributors except the one that's provided (based on underlying channel CHA-RL5a)`() = runTest {
         val statusLifecycle = spyk(DefaultRoomLifecycle(logger))
@@ -179,8 +186,9 @@ class RetryTest {
 
         val contributors = createRoomFeatureMocks()
         val messagesContributor = contributors.first { it.featureName == "messages" }
-        messagesContributor.channel.setState(ChannelState.failed)
-        messagesContributor.channel.reason = ErrorInfo("Failed channel messages", HttpStatusCode.InternalServerError)
+
+        val errorInfo = ErrorInfo("Failed channel messages", HttpStatusCode.InternalServerError)
+        messagesContributor.channel.setState(ChannelState.failed, errorInfo)
 
         val roomLifecycle = spyk(RoomLifecycleManager(roomScope, statusLifecycle, contributors, logger))