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);
}