public void ScoreSheet_LargeStraightUnset_RecordLargeStraightWithValidSetAsFourty() { // Arrange _straightValidator.Setup(x => x.IsValid(5, It.IsAny <IEnumerable <IDie> >())).Returns(true); // Act int?largeStraightScore = _scoreSheet.RecordLargeStraight(_diceCup.Object); //Assert _scoreSheet.LargeStraight.Should().Be(40); }