     }
 
     func testUnregister() {
-        let selector = SelectSelector()
+        let selector = try! SelectSelector()
         let socket = try! TCPSocket()
 
         try! selector.register(socket.fileDescriptor, events: [.read], data: nil)

    }

    func testRegisterKeyError() {
        let selector = SelectSelector()
        let socket = try! TCPSocket()
        try! selector.register(socket.fileDescriptor, events: [.read], data: nil)


    }

    func testSelectEventFilter() {
        let selector = try! SelectSelector()

        let port = try! getUnusedTCPPort()
        let listenSocket = try! TCPSocket()
