public void EngineService_GetCombination_CombinationIsValid_ReturnCombinationNoInput()
{
const string INPUT = "foo";
_readService.Setup(p => p.ReadLine()).Returns(INPUT);
_refereeService.Setup(p => p.IsValid(INPUT)).Returns(true);
string result = _testedService.GetCombination();
Assert.AreEqual(INPUT, result);
_writeServiceMock.Verify(p => p.Write(It.IsAny <string>()), Times.Never);
}
