public void TestGeneratePermutationFromKey(int numObjects)
{
var factorial = new FactorialCalculator().Factorial(numObjects);
var permutationGenerator = new PermutationGenerator();
var permutationSet = new HashSet <string>();
for (int i = 0; i < factorial; i++)
{
var permutation = permutationGenerator.GeneratePermutationFromKey(i, numObjects).GetPermutation();
var permutationString = permutation.Aggregate("", (agg, digit) => $"{agg}{digit}");
Assert.False(permutationSet.Contains(permutationString));
permutationSet.Add(permutationString);
}
Assert.AreEqual(factorial, permutationSet.Count);
}
