public void PeekEnumerator_ShouldWorkForEmptyEnumerator()
{
var data = new int [0];
var enumerator = new PeekEnumerator <int>(data);
Assert.IsFalse(enumerator.TryPeek(out _));
Assert.IsFalse(enumerator.MoveNext());
Assert.IsFalse(enumerator.TryPeek(out _));
}
public void PeekEnumerator_ShouldWorkForOneElement()
{
var data = new int[] { 1 };
var enumerator = new PeekEnumerator <int>(data);
Assert.IsTrue(enumerator.TryPeek(out var first));
Assert.AreEqual(1, first);
Assert.IsTrue(enumerator.MoveNext());
Assert.AreEqual(1, enumerator.Current);
Assert.IsFalse(enumerator.TryPeek(out _));
Assert.IsFalse(enumerator.MoveNext());
}