public void GetUserInputCallsWriteAndReadLine(string input, string expected)
        {
            _missionControl = new MissionControl(null, _mockUserIo);
            _mockUserIo.Stub(x => x.ReadLine()).Return(input);

            var actual = _missionControl.GetUserInput();

            _mockUserIo.AssertWasCalled(x => x.Write(": "));

            Assert.AreEqual(expected, actual);
        }