public void Enumerator_Dispose()
{
var collection = new GrowingCollection <string>();
for (int i = 0; i < 5000; i++)
{
collection.Add(i.ToString());
}
GrowingCollection <string> .Enumerator enumerator = collection.GetEnumerator();
for (int i = 4999; i >= 0; i--)
{
enumerator.MoveNext();
Assert.AreEqual(i.ToString(), enumerator.Current);
enumerator.Dispose(); // Expects No-Op.
}
enumerator.Reset();
for (int i = 4999; i >= 0; i--)
{
enumerator.MoveNext();
Assert.AreEqual(i.ToString(), enumerator.Current);
enumerator.Dispose(); // Expects No-Op.
}
Assert.AreEqual(5000, enumerator.Count);
}
public void Enumerator_Reset()
{
var collection = new GrowingCollection <string>();
for (int i = 0; i < 5000; i++)
{
collection.Add(i.ToString());
}
GrowingCollection <string> .Enumerator enumerator = collection.GetEnumerator();
Assert.AreEqual(5000, enumerator.Count);
Assert.ThrowsException <ArgumentOutOfRangeException>(() => enumerator.Current);
for (int i = 4999; i >= 0; i--)
{
bool canMove = enumerator.MoveNext();
Assert.IsTrue(canMove);
Assert.AreEqual(i.ToString(), enumerator.Current);
}
{
Assert.AreEqual(5000, enumerator.Count);
bool canMove = enumerator.MoveNext();
Assert.IsFalse(canMove);
Assert.AreEqual("0", enumerator.Current);
Assert.AreEqual(5000, enumerator.Count);
}
enumerator.Reset();
Assert.AreEqual(5000, enumerator.Count);
Assert.ThrowsException <ArgumentOutOfRangeException>(() => enumerator.Current);
for (int i = 4999; i >= 0; i--)
{
bool canMove = enumerator.MoveNext();
Assert.IsTrue(canMove);
Assert.AreEqual(i.ToString(), enumerator.Current);
}
{
Assert.AreEqual(5000, enumerator.Count);
bool canMove = enumerator.MoveNext();
Assert.IsFalse(canMove);
Assert.AreEqual("0", enumerator.Current);
Assert.AreEqual(5000, enumerator.Count);
}
}
public void Enumerator_MoveNextAndCurrent()
{
var collection = new GrowingCollection <string>();
for (int i = 0; i < 5000; i++)
{
collection.Add(i.ToString());
}
collection.Add(null);
collection.Add("");
GrowingCollection <string> .Enumerator enumerator = collection.GetEnumerator();
Assert.ThrowsException <ArgumentOutOfRangeException>(() => enumerator.Current);
Assert.ThrowsException <ArgumentOutOfRangeException>(() => ((IEnumerator)enumerator).Current);
Assert.ThrowsException <ArgumentOutOfRangeException>(() => ((IEnumerator <string>)enumerator).Current);
{
bool canMove = enumerator.MoveNext();
Assert.IsTrue(canMove);
Assert.AreEqual("", enumerator.Current);
Assert.AreEqual("", ((IEnumerator)enumerator).Current);
Assert.AreEqual("", ((IEnumerator <string>)enumerator).Current);
}
{
bool canMove = enumerator.MoveNext();
Assert.IsTrue(canMove);
Assert.IsNull(enumerator.Current);
Assert.IsNull(((IEnumerator)enumerator).Current);
Assert.IsNull(((IEnumerator <string>)enumerator).Current);
}
for (int i = 4999; i >= 0; i--)
{
bool canMove = enumerator.MoveNext();
Assert.IsTrue(canMove);
Assert.AreEqual(i.ToString(), enumerator.Current);
Assert.AreEqual(i.ToString(), ((IEnumerator)enumerator).Current);
Assert.AreEqual(i.ToString(), ((IEnumerator <string>)enumerator).Current);
}
{
bool canMove = enumerator.MoveNext();
Assert.IsFalse(canMove);
Assert.AreEqual("0", enumerator.Current);
Assert.AreEqual("0", ((IEnumerator)enumerator).Current);
Assert.AreEqual("0", ((IEnumerator <string>)enumerator).Current);
}
}
private static async Task CheckEnumeratorUnderConcurrencyAsync <T>(GrowingCollection <T> .Enumerator enumerator, int expectedCount)
{
Assert.IsNotNull(enumerator);
Assert.IsTrue(expectedCount > 0);
Random rnd = new Random();
await Task.Delay(rnd.Next(10)).ConfigureAwait(continueOnCapturedContext: false);
Assert.AreEqual(expectedCount, enumerator.Count);
for (int i = expectedCount - 1; i >= 0; i--)
{
Assert.IsTrue(enumerator.MoveNext());
Assert.AreEqual(i.ToString(), enumerator.Current);
await Task.Delay(rnd.Next(2)).ConfigureAwait(continueOnCapturedContext: false);
}
{
Assert.IsFalse(enumerator.MoveNext());
}
enumerator.Reset();
Assert.AreEqual(expectedCount, enumerator.Count);
for (int i = expectedCount - 1; i >= 0; i--)
{
Assert.IsTrue(enumerator.MoveNext());
Assert.AreEqual(i.ToString(), enumerator.Current);
await Task.Delay(rnd.Next(2)).ConfigureAwait(continueOnCapturedContext: false);
}
{
Assert.IsFalse(enumerator.MoveNext());
}
}