public void WhenIsNull_ThenThrowException()
 {
     Assert.Throws <ArgumentNullException>(() => ArrayTwoDimensionExtensions.ToSingleDimension <string>(null));
 }
 public void WhenSourceIsNull_ThenThrowException()
 {
     Assert.Throws <ArgumentNullException>(() => ArrayTwoDimensionExtensions.Populate(null, Value));
 }