public void FilterNumbers_WithNullArgument_ThrowArgumentNulException()
{
int[] array = null;
PredicateDigit3 digit = new PredicateDigit3();
int[] actual = ArrayExtension.FilterNumbers(array, digit);
}
public void FilterNumbers_WithDigit3_Success()
{
int[] array = new int[] { 3, 2, 77, 37, 701 };
PredicateDigit3 digit = new PredicateDigit3();
int[] expected = new int[] { 3, 37 };
int[] actual = ArrayExtension.FilterNumbers(array, digit);
CollectionAssert.AreEqual(expected, actual);
}