public void Sum_to_1()
 {
     Assert.That(SumOfMultiples.To(new[] { 3, 5 }, 1), Is.EqualTo(0));
 }
 public void Sum_to_10000()
 {
     Assert.That(SumOfMultiples.To(new[] { 43, 47 }, 10000), Is.EqualTo(2203160));
 }
 public void Sum_to_1000()
 {
     Assert.That(SumOfMultiples.To(new[] { 3, 5 }, 1000), Is.EqualTo(233168));
 }
 public void Sum_to_20()
 {
     Assert.That(SumOfMultiples.To(new[] { 7, 13, 17 }, 20), Is.EqualTo(51));
 }
 public void Sum_to_3()
 {
     Assert.That(SumOfMultiples.To(new[] { 3, 5 }, 4), Is.EqualTo(3));
 }