public async Task TestSubscribeCommand()
{
var tcs = new TaskCompletionSource <ResultMessage>();
client.Subscibe(new CallMessage("blockchain.address.get_history",
new[] { "mrx4EmF6zHXky3zDoeJ1K7KvYcuNn8Mmc4" }), r =>
{
tcs.SetResult(r);
});
var msg = await tcs.Task;
Assert.AreEqual(msg.Result[0].Value <string>("tx_hash"),
"3aa2a5a9825ca767e092bcc19487aa13969eeb217fd0fba8492543bbb8c30954");
Assert.AreEqual(msg.Result[0].Value <int>("height"), 260144);
}