@Test public void find() {

    UnionFind uf = new UnionFind(100);
    uf.union(1, 5);
    uf.union(7, 9);
    uf.union(10, 11);
    uf.union(15, 1);
    uf.union(15, 50);
    assertThat(uf.find(1), is(50));
    assertThat(uf.find(5), is(50));
    assertThat(uf.find(7), is(7));
    assertThat(uf.find(8), is(8));
    assertThat(uf.find(10), is(10));
    assertThat(uf.find(11), is(10));
    assertThat(uf.find(15), is(50));
    assertThat(uf.find(50), is(50));
}