@Test
public void sub_basket_set_collection_should_be_empty() {
BasketSuite suite = new BasketSuite();
assertThat(suite.getSubBasketSets().isEmpty(), is(true));
}
@Test
public void sub_basket_set_collection_should_has_only_one_item() {
BasketSuite suite = new BasketSuite();
suite.addBook("first", 1);
assertThat(suite.getSubBasketSets().size(), is(1));
}
