public void ScoreSheet_SmallStraightUnset_RecordSmallStraightWithValidSetAsThirty() { // Arrange _straightValidator.Setup(x => x.IsValid(4, It.IsAny <IEnumerable <IDie> >())).Returns(true); // Act int?smallStraightScore = _scoreSheet.RecordSmallStraight(_diceCup.Object); //Assert _scoreSheet.SmallStraight.Should().Be(30); }