public void Filter_NullArray_ArgumentNullException()
{
IEnumerable <int> numbers = null;
IntPredicate predicate = new IntPredicate(7);
Assert.Throws <ArgumentNullException>(() => numbers.Filter(x => predicate.IsMatch(x)));
}
public IEnumerable <int> Filter_IsCorrect_IntValue(IEnumerable <int> numbers, int filter)
{
IntPredicate predicate = new IntPredicate(filter);
return(numbers.Filter(x => predicate.IsMatch(x)));
}