@Test
public void simpleTest() {

    List<Set<Integer>> txns = new ArrayList<>();
    txns.add(intIfy("a, b, c"));
    txns.add(intIfy("a, b"));
    txns.add(intIfy("a"));
    FPGrowth fp = new FPGrowth();
    List<ItemsetWithCount> itemsets = fp.getItemsetsWithSupportRatio(txns, .7);
    //printItemsets(itemsets);
    assertEquals(3, itemsets.size());
}