public void testMakeSet()
{
DisjointSets <string> disjSets = new DisjointSets <string>();
disjSets.makeSet("a");
Assert.AreEqual(1, disjSets.numberDisjointSets());
disjSets.makeSet("a");
Assert.AreEqual(1, disjSets.numberDisjointSets());
disjSets.makeSet("b");
Assert.AreEqual(2, disjSets.numberDisjointSets());
}