public void GenerateSubsetsRecursiveTest()
{
//Arrange
string item = "abcd";
int subsetLength = 2;
char[] temp = new char[item.Length];
IList <string> subsets = new List <string>();
//Act
_target.GenerateSubsetsRecursive(item, subsetLength, temp, subsets);
//Assert
Assert.AreEqual(6, subsets.Count);
Assert.AreEqual <string>("ab", subsets[0]);
Assert.AreEqual <string>("ac", subsets[1]);
Assert.AreEqual <string>("ad", subsets[2]);
Assert.AreEqual <string>("bc", subsets[3]);
Assert.AreEqual <string>("bd", subsets[4]);
Assert.AreEqual <string>("cd", subsets[5]);
}
