SignalClientTest

@@ -124,10 +124,12 @@ constructor(
         }
         coroutineScope.launch {
             delay(startDelay)
-            if (iceState != IceState.DISCONNECTED && sessionUrl != null && sessionToken != null) {
+            val url = sessionUrl
+            val token = sessionToken
+            if (iceState != IceState.DISCONNECTED && url != null && token != null) {
                 val opts = ConnectOptions()
                 opts.reconnect = true
-                client.join(sessionUrl!!, sessionToken!!, opts)
+                client.join(url, token, opts)
             }
         }
     }

+package io.livekit.android.room
+
+class RTCEngineTest {
+}
\ No newline at end of file

+package io.livekit.android.room
+
+import com.google.protobuf.util.JsonFormat
+import kotlinx.serialization.json.Json
+import livekit.LivekitRtc
+import okhttp3.*
+import okio.ByteString.Companion.toByteString
+import org.junit.Before
+import org.junit.Test
+import org.mockito.Mockito
+import org.mockito.kotlin.verify
+
+class SignalClientTest {
+
+    lateinit var wsFactory: MockWebsocketFactory
+    lateinit var client: SignalClient
+    lateinit var listener: SignalClient.Listener
+
+    class MockWebsocketFactory : WebSocket.Factory {
+        lateinit var ws: WebSocket
+        lateinit var request: Request
+        override fun newWebSocket(request: Request, listener: WebSocketListener): WebSocket {
+            ws = Mockito.mock(WebSocket::class.java)
+            this.request = request
+            return ws
+        }
+    }
+
+    @Before
+    fun setup() {
+        wsFactory = MockWebsocketFactory()
+        client = SignalClient(
+            wsFactory,
+            JsonFormat.parser(),
+            JsonFormat.printer(),
+            Json,
+            useJson = false
+        )
+        listener = Mockito.mock(SignalClient.Listener::class.java)
+        client.listener = listener
+    }
+
+    fun join() {
+        client.join("http://www.example.com", "", null)
+    }
+
+    @Test
+    fun joinAndResponse() {
+        join()
+        client.onOpen(
+            wsFactory.ws,
+            Response.Builder()
+                .request(wsFactory.request)
+                .code(200)
+                .protocol(Protocol.HTTP_2)
+                .message("")
+                .build()
+        )
+
+        val response = with(LivekitRtc.SignalResponse.newBuilder()) {
+            join = with(joinBuilder) {
+                room = with(roomBuilder) {
+                    name = "roomname"
+                    sid = "sid"
+                    build()
+                }
+                build()
+            }
+            build()
+        }
+        val byteArray = response.toByteArray()
+        val byteString = byteArray.toByteString(0, byteArray.size)
+
+        client.onMessage(wsFactory.ws, byteString)
+
+        verify(listener).onJoin(response.join)
+    }
+}
\ No newline at end of file