Labs

1. Create a bi-directional, many-to-one relationship between Rental and InventoryItem.

2. Update the test cases for InventoryItem and Rental to ensure the associations are working correctly.

3. Create a Payment entity mapped to the payment table with properties id, amount, and paymentDate. The payment table looks like this:

+--------------+------------------+------+-----+---------+----------------+
| Field        | Type             | Null | Key | Default | Extra          |
+--------------+------------------+------+-----+---------+----------------+
| id           | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| rental_id    | int(11)          | YES  | MUL | NULL    |                |
| amount       | decimal(5,2)     | NO   |     | NULL    |                |
| payment_date | datetime         | NO   |     | NULL    |                |
+--------------+------------------+------+-----+---------+----------------+

* Create a JUnit test to test the Payment entity.

1. Create a bi-directional, many-to-one relationship from Payment to Rental. Update the unit tests for both entities to validate each side of the relationship.

2. In Rental, create addPayment and removePayment methods.

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