public void SendChatMessage_EmptyChatMessage_ChatServiceSendChatMessageNeverCalled()
{
// Arrange
var wasCalled = false;
viewModel.MessageToBeSent = String.Empty;
chatServiceManagerMock.Setup(orp => orp.SendChatMessage(It.IsAny <Int32>(), It.IsAny <String>(), It.IsAny <String>()))
.Callback(() => wasCalled = true);
// Act
viewModel.SendChatMessage();
// Assert
Assert.IsFalse(wasCalled, "because the message to be sent is empty");
}
