/// <summary>
/// Helper function to create an HashSet fulfilling the given specific parameters. The function will
/// create an HashSet using the Comparer constructor and then add values
/// to it until it is full. It will begin by adding the desired number of matching,
/// followed by random (deterministic) elements until the desired count is reached.
/// </summary>
protected IEnumerable <T> CreateSegmentedHashSet(IEnumerable <T>?enumerableToMatchTo, int count, int numberOfMatchingElements)
{
SegmentedHashSet <T> set = new SegmentedHashSet <T>(GetIEqualityComparer());
int seed = 528;
SegmentedList <T>?match = null;
// Add Matching elements
if (enumerableToMatchTo != null)
{
match = enumerableToMatchTo.ToSegmentedList();
for (int i = 0; i < numberOfMatchingElements; i++)
{
set.Add(match[i]);
}
}
// Add elements to reach the desired count
while (set.Count < count)
{
T toAdd = CreateT(seed++);
while (set.Contains(toAdd) || (match != null && match.Contains(toAdd, GetIEqualityComparer()))) // Don't want any unexpectedly duplicate values
{
toAdd = CreateT(seed++);
}
set.Add(toAdd);
}
// Validate that the Enumerable fits the guidelines as expected
Debug.Assert(set.Count == count);
if (match != null)
{
int actualMatchingCount = 0;
foreach (T lookingFor in match)
{
actualMatchingCount += set.Contains(lookingFor) ? 1 : 0;
}
Assert.Equal(numberOfMatchingElements, actualMatchingCount);
}
return(set);
}
private protected static string CreateT(SegmentedHashSet <string> set, int seed)
{
int stringLength = seed % 10 + 5;
Random rand = new Random(seed);
byte[] bytes = new byte[stringLength];
rand.NextBytes(bytes);
string ret = Convert.ToBase64String(bytes);
while (set.Contains(ret))
{
rand.NextBytes(bytes);
ret = Convert.ToBase64String(bytes);
}
return(ret);
}