private void TestCase(int itrsWithVal, int specifiedValsOnItr, bool removeDups)
{
// Build a random number of lists
IList <int?> expected = new List <int?>();
Random random = new Random(Random.Next());
int numLists = itrsWithVal + random.Next(1000 - itrsWithVal);
IList <int>[] lists = new IList <int> [numLists];
for (int i = 0; i < numLists; i++)
{
lists[i] = new List <int>();
}
int start = random.Next(1000000);
int end = start + VALS_TO_MERGE / itrsWithVal / Math.Abs(specifiedValsOnItr);
for (int i = start; i < end; i++)
{
int maxList = lists.Length;
int maxValsOnItr = 0;
int sumValsOnItr = 0;
for (int itrWithVal = 0; itrWithVal < itrsWithVal; itrWithVal++)
{
int list = random.Next(maxList);
int valsOnItr = specifiedValsOnItr < 0 ? (1 + random.Next(-specifiedValsOnItr)) : specifiedValsOnItr;
maxValsOnItr = Math.Max(maxValsOnItr, valsOnItr);
sumValsOnItr += valsOnItr;
for (int valOnItr = 0; valOnItr < valsOnItr; valOnItr++)
{
lists[list].Add(i);
}
maxList = maxList - 1;
ArrayUtil.Swap(lists, list, maxList);
}
int maxCount = removeDups ? maxValsOnItr : sumValsOnItr;
for (int count = 0; count < maxCount; count++)
{
expected.Add(i);
}
}
// Now check that they get merged cleanly
IEnumerator <int>[] itrs = new IEnumerator <int> [numLists];
for (int i = 0; i < numLists; i++)
{
itrs[i] = lists[i].GetEnumerator();
}
MergedIterator <int> mergedItr = new MergedIterator <int>(removeDups, itrs);
IEnumerator <int?> expectedItr = expected.GetEnumerator();
while (expectedItr.MoveNext())
{
Assert.IsTrue(mergedItr.MoveNext());
Assert.AreEqual(expectedItr.Current, mergedItr.Current);
}
Assert.IsFalse(mergedItr.MoveNext());
}
public virtual void TestMergeEmpty()
{
IEnumerator <int> merged = new MergedIterator <int>();
Assert.IsFalse(merged.MoveNext());
merged = new MergedIterator <int>((new List <int>()).GetEnumerator());
Assert.IsFalse(merged.MoveNext());
IEnumerator <int>[] itrs = new IEnumerator <int> [Random.Next(100)];
for (int i = 0; i < itrs.Length; i++)
{
itrs[i] = (new List <int>()).GetEnumerator();
}
merged = new MergedIterator <int>(itrs);
Assert.IsFalse(merged.MoveNext());
}
