blockInFamilyOne.setKeepActive(true);
blockInFamilyOne.setPrefab("test:prefabWithString");
blockInFamilyTwo = new Block();
blockInFamilyTwo.setPrefab("test:prefabWithString");
blockInFamilyTwo.setKeepActive(true);
blockManager.addBlockFamily(new HorizontalBlockFamily(new BlockUri("test:blockFamily"),
ImmutableMap.<Side, Block>of(Side.FRONT, blockInFamilyOne, Side.LEFT, blockInFamilyTwo, Side.RIGHT, blockInFamilyTwo, Side.BACK, blockInFamilyOne),
Collections.<String>emptyList()), true);
keepActiveBlock = new Block();
keepActiveBlock.setKeepActive(true);