public ArraySegmentAssertions <TActualItem> BeEqualTo <TExpected, TExpectedItem>(TExpected expected, Func <TActualItem, TExpectedItem, bool> comparer)
where TExpected : IEnumerable <TExpectedItem>
{
if (expected is null)
{
throw new EqualToAssertionException <ArraySegment <TActualItem>, TExpected>(Actual, expected);
}
var(result, index, _, _) = Actual.AsSpan().Compare(expected, comparer);
return(result switch
{
EqualityResult.NotEqualAtIndex
=> throw new EqualToAssertionException <ArraySegment <TActualItem>, TExpected>(
Actual,
expected,
$"Collections differ at index {index}."),
EqualityResult.LessItem
=> throw new EqualToAssertionException <ArraySegment <TActualItem>, TExpected>(
Actual,
expected,
$"Actual collection has less items."),
EqualityResult.MoreItems
=> throw new EqualToAssertionException <ArraySegment <TActualItem>, TExpected>(
Actual,
expected,
$"Actual collection has more items."),
_ => this,
});
