private void Amb([PexAssumeNotNull] IEnumerable <int> firstSource, [PexAssumeNotNull] IEnumerable <int> secondSource, int firstDelay, int secondDelay)
{
PexAssume.InRange(firstDelay, 0, 10);
PexAssume.InRange(secondDelay, 0, 10);
PexAssume.IsTrue(firstDelay != secondDelay);
var first = AmbHelper(firstSource, firstDelay);
var second = AmbHelper(secondSource, secondDelay);
var enumerable = first.Amb(second);
var enumerator = enumerable.GetEnumerator();
var selectedSource = firstDelay < secondDelay ? firstSource : secondSource;
var sourceEnumerator = selectedSource.GetEnumerator();
var firstSourceMove = sourceEnumerator.MoveNext();
var firstAmbMove = enumerator.MoveNext();
PexAssert.AreEqual(firstSourceMove, firstAmbMove);
if (firstAmbMove)
{
var firstThread = enumerator.Current.Second;
PexAssert.AreEqual(sourceEnumerator.Current, enumerator.Current.First);
while (sourceEnumerator.MoveNext())
{
PexAssert.IsTrue(enumerator.MoveNext());
PexAssert.AreEqual(sourceEnumerator.Current, enumerator.Current.First);
PexAssert.AreEqual(firstThread, enumerator.Current.Second);
}
PexAssert.IsFalse(enumerator.MoveNext());
}
}