public void WhenSequenceIsRequestedSequenceLengthIsStored()
 {
     var sut = new FinbonacciNumberGeneratorWithHistory();
     sut.GetSequenceOfLength(8);
     Assert.That(8, Is.EqualTo(sut.LastSequenceLength), "sequence length");
 }
 public void CannotRequestSequenceOfLengthLessThanEight()
 {
     var sut = new FinbonacciNumberGeneratorWithHistory();
     Assert.Throws<ArgumentException>(() => sut.GetSequenceOfLength(7));
 }