How does one test generic collections in nunit?

Question

How can I do something like this in NUnit?

class Foo
{
    int Value { get; set; }
    ...
}
...
ICollection<Foo> someFoos = GetSomeFoos();
Expect(List.Map(someFoos).Property("Value"), Has.Some.EqualTo(7));

List.Map() only accepts ICollection, not ICollection<T>.

Answer 1

well, you could conceptually use linq to objects extensions, something like:

Expect(someAs.Count(), Has.Some.EqualTo(7));

Answer 2

What if you tried something like this instead:

List<Foo> someFoos = GetSomeFoos();

as List<T> does implement the ICollection interface.

Answer 3

Well, you could convert your ICollection<T> to something that implements ICollection. Array for instance:

ICollection<Foo> someFoos = GetSomeFoos();
var array = new Foo[10];
someFoos.CopyTo(array);
Expect(List.Map(array).Property("Value"), Has.Some.EqualTo(7));