public async Task If_user_isnt_specified_with_command_say_error_message(string messageWithNoUser)
{
// arrange
var expectedMessage = $"You must specify a user to trout.";
var twitchLibMessage = TwitchLibMessageBuilder.Create()
.WithUsername("doesn't matter")
.Build();
var chatMessage = ChatMessageBuilder.Create()
.WithTwitchLibMessage(twitchLibMessage)
.WithMessage(messageWithNoUser)
.Build();
var troutRequest = new Trout(chatMessage);
// act
await _handler.Handle(troutRequest, CancellationToken.None);
// assert
_mockTwitchClient.Verify(m =>
m.SendMessage(It.IsAny <string>(), expectedMessage, false), Times.Once);
}
