@Test
public void setItemsPerPage() {
pg.setItems(123);
pg.setPage(11);
// 变大itemsPerPage
pg.setItemsPerPage(20);
assertEquals(7, pg.getPages());
assertEquals(123, pg.getItems());
assertEquals(20, pg.getItemsPerPage());
assertEquals(6, pg.getPage());
assertEquals(1, pg.getFirstPage());
assertEquals(5, pg.getPreviousPage());
assertEquals(1, pg.getPreviousPage(10));
assertEquals(7, pg.getNextPage());
assertEquals(7, pg.getNextPage(10));
assertEquals(101, pg.getBeginIndex());
assertEquals(120, pg.getEndIndex());
assertEquals(100, pg.getOffset());
assertEquals(20, pg.getLength());
assertTrue(pg.isDisabledPage(0));
assertFalse(pg.isDisabledPage(1));
assertFalse(pg.isDisabledPage(2));
assertTrue(pg.isDisabledPage(6));
assertFalse(pg.isDisabledPage(7));
assertTrue(pg.isDisabledPage(8));
// 变小itemsPerPage
pg.setItemsPerPage(5);
assertEquals(25, pg.getPages());
assertEquals(123, pg.getItems());
assertEquals(5, pg.getItemsPerPage());
assertEquals(21, pg.getPage());
assertEquals(1, pg.getFirstPage());
assertEquals(20, pg.getPreviousPage());
assertEquals(11, pg.getPreviousPage(10));
assertEquals(22, pg.getNextPage());
assertEquals(25, pg.getNextPage(10));
assertEquals(101, pg.getBeginIndex());
assertEquals(105, pg.getEndIndex());
assertEquals(100, pg.getOffset());
assertEquals(5, pg.getLength());
assertTrue(pg.isDisabledPage(0));
assertFalse(pg.isDisabledPage(1));
assertFalse(pg.isDisabledPage(2));
assertTrue(pg.isDisabledPage(21));
assertFalse(pg.isDisabledPage(22));
assertTrue(pg.isDisabledPage(26));
}
