public void DisplayTodoListHeaderStateOutputsHeaderText()
        {
            IConsole mockConsole = Substitute.For<IConsole>();
            ILog mockLog = Substitute.For<ILog>();
            ITodoList mockTodoList = Substitute.For<ITodoList>();
            DisplayTodoListHeaderState state = new DisplayTodoListHeaderState(mockConsole, mockLog, mockTodoList);
            state.Execute();

            mockConsole.Received(1).Clear();
            mockConsole.Received().OutputLine(Arg.Any<String>());
        }
        public void DisplayTodoHeaderStateOutputsAllTodoItems()
        {
            TodoEntry todoEntry = new TodoEntry("entry");
            List<TodoEntry> todoEntries = new List<TodoEntry>() { todoEntry };

            IConsole mockConsole = Substitute.For<IConsole>();
            ILog mockLog = Substitute.For<ILog>();
            ITodoList mockTodoList = Substitute.For<ITodoList>();
            mockTodoList.GetEntries().Returns(todoEntries);

            DisplayTodoListHeaderState state = new DisplayTodoListHeaderState(mockConsole, mockLog, mockTodoList);
            state.Execute();

            mockConsole.Received(1).Output("0> ");
            mockConsole.Received(1).OutputLine("entry");
        }