public void test_01() {

/* Create a new item with no storage.

* No error checking is needed on the title of item.

*/

Item i1 = new Item("iPad Pro");

assertEquals("iPad Pro", i1.getTitle());

assertEquals(0, i1.getAmount());

/* When there was no error,

* the item's info summarizes its title and current amount.

* Note the spaces after the colon and before the opening parenthesis.

*/

assertEquals("Item: iPad Pro (0)", i1.getInfo());

}

@Test

public void test_02() {

Item i1 = new Item("iPad Pro");

/* Amount for increase must be positive. */

i1.increaseAmount(0);

/* When the last-invoked mutator resulted in an error,

* there should be no change on the item's title or amount,

* and the item's info should be set to the corresponding error message.

*

* Note. Invoking accessors does not modify the info of the item.

* Only invoking mutators may.

*/

assertEquals("Error: non-positive amount 0", i1.getInfo());

i1.increaseAmount(-3);

assertEquals("Error: non-positive amount -3", i1.getInfo());

assertEquals(0, i1.getAmount());

}

no library classes please