@Test
public void testUnion() {
wqu.union(4, 3);
Assert.assertArrayEquals(new int[] {0, 1, 2, 4, 4, 5, 6, 7, 8, 9}, wqu.getId());
Assert.assertArrayEquals(new int[] {1, 1, 1, 1, 2, 1, 1, 1, 1, 1}, wqu.getSize());
wqu.union(3, 8);
Assert.assertArrayEquals(new int[] {0, 1, 2, 4, 4, 5, 6, 7, 4, 9}, wqu.getId());
Assert.assertArrayEquals(new int[] {1, 1, 1, 1, 3, 1, 1, 1, 1, 1}, wqu.getSize());
wqu.union(6, 5);
Assert.assertArrayEquals(new int[] {0, 1, 2, 4, 4, 6, 6, 7, 4, 9}, wqu.getId());
Assert.assertArrayEquals(new int[] {1, 1, 1, 1, 3, 1, 2, 1, 1, 1}, wqu.getSize());
wqu.union(9, 4);
Assert.assertArrayEquals(new int[] {0, 1, 2, 4, 4, 6, 6, 7, 4, 4}, wqu.getId());
Assert.assertArrayEquals(new int[] {1, 1, 1, 1, 4, 1, 2, 1, 1, 1}, wqu.getSize());
wqu.union(2, 1);
Assert.assertArrayEquals(new int[] {0, 2, 2, 4, 4, 6, 6, 7, 4, 4}, wqu.getId());
Assert.assertArrayEquals(new int[] {1, 1, 2, 1, 4, 1, 2, 1, 1, 1}, wqu.getSize());
wqu.union(5, 0);
Assert.assertArrayEquals(new int[] {6, 2, 2, 4, 4, 6, 6, 7, 4, 4}, wqu.getId());
Assert.assertArrayEquals(new int[] {1, 1, 2, 1, 4, 1, 3, 1, 1, 1}, wqu.getSize());
wqu.union(7, 2);
Assert.assertArrayEquals(new int[] {6, 2, 2, 4, 4, 6, 6, 2, 4, 4}, wqu.getId());
Assert.assertArrayEquals(new int[] {1, 1, 3, 1, 4, 1, 3, 1, 1, 1}, wqu.getSize());
wqu.union(6, 1);
Assert.assertArrayEquals(new int[] {6, 2, 6, 4, 4, 6, 6, 2, 4, 4}, wqu.getId());
Assert.assertArrayEquals(new int[] {1, 1, 3, 1, 4, 1, 6, 1, 1, 1}, wqu.getSize());
wqu.union(7, 3);
Assert.assertArrayEquals(new int[] {6, 2, 6, 4, 6, 6, 6, 2, 4, 4}, wqu.getId());
Assert.assertArrayEquals(new int[] {1, 1, 3, 1, 4, 1, 10, 1, 1, 1}, wqu.getSize());
}
@Test
public void testInit() {
Assert.assertArrayEquals(new int[] {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}, wqu.getId());
Assert.assertArrayEquals(new int[] {1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, wqu.getSize());
}