public void ForEach_ActionAt_With_ValidData_Must_Succeed(int[] source)
{
// Arrange
var wrapped = Wrap.AsReadOnlyList(source);
var result = new List <(int, int)>();
var expected = new List <(int, int)>();
System.Linq.EnumerableEx.ForEach(source, (item, index) => expected.Add((item, index)));
// Act
ReadOnlyList
.ForEach <Wrap.ReadOnlyList <int>, int>(wrapped, (item, index) => result.Add((item, index)));
// Assert
_ = result.Must()
.BeEnumerableOf <(int, int)>()
.BeEqualTo(expected);
}