public void WrapEmptyList()
{
var list = new List <string>();
var sut = new PeekableEnumerator <string>(list.GetEnumerator());
Assert.IsNull(sut.Current);
Assert.IsNull(((IEnumerator)sut).Current);
Assert.IsNull(sut.PeekNext);
Assert.IsFalse(sut.MoveNext());
sut.Reset();
Assert.IsNull(sut.Current);
}
public void WrapList()
{
var list = new List <string>(new[] { "1", "2", "3" });
var sut = new PeekableEnumerator <string>(list.GetEnumerator());
Assert.AreEqual(3, list.Count, "This function assumes a list with 3 elements");
Assert.IsNull(sut.Current);
Assert.IsTrue(sut.MoveNext());
Assert.AreEqual("1", sut.Current);
Assert.AreEqual("1", ((IEnumerator)sut).Current);
Assert.IsTrue(sut.MoveNext());
Assert.AreEqual("2", sut.Current);
Assert.IsTrue(sut.MoveNext());
Assert.AreEqual("3", sut.Current);
Assert.IsFalse(sut.MoveNext());
sut.Reset();
Assert.IsNull(sut.Current);
Assert.IsTrue(sut.MoveNext());
Assert.AreEqual("1", sut.Current);
}
public void ThrowsResetUnavailable()
{
var sut = new PeekableEnumerator <string>(new YieldReturnEnum().GetEnumerator());
Assert.Throws <System.NotSupportedException>(() => sut.Reset());
}
