Fix unit tests

src/main/kotlin/com/dmdirc/ktirc/IrcClientImpl.kt

@@ -164,6 +164,7 @@ internal class IrcClientImpl(private val config: IrcClientConfig) : Experimental
         channelState.clear()
         userState.reset()
         socket = null
+        connecting.tryLock()
         connecting.unlock()
     }
 

src/test/kotlin/com/dmdirc/ktirc/IrcClientImplTest.kt

@@ -453,6 +453,12 @@ internal class IrcClientImplTest {
         client.resolver = mockResolver
         client.connect()
 
+        launch {
+            delay(50)
+            readLineChannel.close()
+            sendLineChannel.close()
+        }
+
         client.disconnect()
 
         verify(timeout = 500) {