public void ToReadOnly_Empty()
{
var xs = new List <int>();
var e1 = CollectionExtensions.ToReadOnly <int>(enumerable: null);
AssertEmpty(e1);
var e2 = Array.Empty <int>().ToReadOnly();
AssertEmpty(e2);
var e3 = xs.ToReadOnly();
AssertEmpty(e3);
xs.Add(1);
AssertEmpty(e3);
Assert.AreSame(e1, e2);
Assert.AreSame(e2, e3);
var e4 = CollectionExtensions.ToReadOnly <int>(enumerable: null);
var e5 = Array.Empty <int>().ToReadOnly();
var e6 = new List <int>().ToReadOnly();
Assert.AreSame(e3, e4);
Assert.AreSame(e4, e5);
Assert.AreSame(e5, e6);
}
public void AsCollection_Null()
{
var xs = default(int[]);
var ys = CollectionExtensions.AsCollection(xs);
Assert.AreEqual(0, ys.Count);
}
public void AsCollection_Array()
{
var xs = new[] { 2, 3, 5 };
var ys = CollectionExtensions.AsCollection(xs);
Assert.AreSame(xs, ys);
}
public void AsCollection_Enumerable()
{
var xs = new[] { 2, 3, 5 }.Select(x => x);
var ys = CollectionExtensions.AsCollection(xs);
Assert.IsTrue(xs.SequenceEqual(ys));
}
public void AsArray_Null()
{
var xs = default(int[]);
var ys = CollectionExtensions.AsArray(xs);
Assert.AreEqual(0, ys.Length);
}
