void logout(object Sender, EventArgs e)
 {
     App.Current.MainPage = new NavigationPage(new MainPage(client.GetBlockChainService()))
     {
         BarBackgroundColor = Color.FromRgb(5, 5, 5)
     };
 }
        public void GetBlockchainService()
        {
            IBlockchainService service = clientWithMock.GetBlockChainService();

            Assert.IsNotNull(service);
        }