public void NextBiggerNumber_NegativeOrZeroNumber_ThrowsArgumentOutOfRangeException(int number)
 {
     Assert.Throws <ArgumentOutOfRangeException>(() => IntOperations.NextBiggerNumber(number));
 }
 public void NextBiggerNumber_AlmostBiggestIntegerNumbers_ThrowsOverFlowException(int number)
 {
     Assert.Throws <OverflowException>(() => IntOperations.NextBiggerNumber(number));
 }
 public int NextBiggerNumber_PositiveIntegerNumber_PositiveTest(int number)
 {
     return(IntOperations.NextBiggerNumber(number));
 }